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  2. Hisamori Noriyuki

Hisamori Noriyuki

  (久森 紀之)

Profile Information

Affiliation
Professor, Faculty of Science and Technology, Department of Engineering and Applied Sciences, Sophia University
Degree
博士（工学）(工学院大学)
Contact information
hisamorisophia.ac.jp
Researcher number
80317510
J-GLOBAL ID
200901033684274272
researchmap Member ID
1000293757

1999－　•Department of Engineering and Applied Science, Faculty of Science and Technology, Sophia Univers, Structional and functional biomaterials
1999－　•Department of Engineering and Applied Science, Faculty of Science and Technology, Sophia Univers, Environmental strength and furacture strenngth

In late years aging in my country lets affection of motor function such as osteoporosis by alteration such as a bone or articular cartilage, osteoarthritis of spine, osteoarthritis increase. Therefore be aimed for improvement of rich quality of life in health, and the living habits that took in sports are spreading broadly. However, with increase and aging of the action population, locomotorium injury such as a fracture, ligamentous breakdown, a cartilage injury increases again, too. A treatment of such a locomotorium disorder is one of a future medical problem. It is important to return attribute of locomotorium, configuration, a physical characteristic to an as possible original physiological state.
I study organism material replacing it in a bone, cartilage, band, arthrosis.
Study in particular medicine and science and technology studies from a confluent point of view.

(Subject of research)
JSPS Research for the Future Program
Fatigue characteristic evaluation of bio-titanium alloy
Effects of Mechanical Stress on Corrosion Resistance of Metallic Biomaterials
Evaluation of corrotion wear of Co-Cr alloy
Fatigue characteristic evaluation of beta-bio-titanium alloy
Influence of surface modification of bio metal material cause to organism
Fracture characteristic of bio-apatite ceramics
HAP Ceramics and HAP layer Formed on It's Surface in a Simulated Body Fluid
Preparation and bio-function evaluation of organic - inorganic hybrid bio composites
Construction of fatigue life improvement by surface treatment technology of titanium alloy for medical cares
Fatigue characteristics evaluation of β type titanium alloy having a notch
Fatigue characteristics evaluation of titanium alloy having a hole
Fatigue characteristics evaluation of SUS316L steel having a hole
Evaluation of Fatigue Characteristic of Ti-6Al-4V alloy shaped by Metal Powder Layered Method
Evaluation of fatigue properties of electron beamed and laser peened Ti-6Al-4V ELI alloy
Evaluation of 4-point Bending Fatigue Properties for Titanium Alloy Interlocking Nail
Effect of notch factor on torsional fatigue property of pure titanium and stainless steel
Evaluation of corrosion wear characteristics of biomedical Co-Cr alloy with a surface modification by ELID grinding
Evaluation of corrosion fatigue properties of pre-strained SUS316 and SUS304 steel
Effect of notches on fatigue properties of β titanium alloy
Proposal of evaluation method of adhesion strength of apatite films deposited on titanium alloy
Evaluation of fatigue characteristic of titanium alloy by shot-peening
Evaluating of corrosion wear　resistance of Co-Cr alloy with designed surface by scratch
Investigation on Bad Fit of Locking Plate for Osteosynthesis
Evaluation of shear adhesion strength of titanium alloy coated with apatite thin film
Evaluation of bending fatigue properties of three-dimensional modeling titanium alloy subjected to surface modification process
Fabrication of artificial bone by reef-building coral and its characteristics
Evaluation of the torsional fatigue characteristics of the titanium alloy
Evaluation of fretting fatigue properties of titanium alloy
Evaluation of fatigue characteristic of Pure titanium alloy by shot-peening
Influence of simulated body fluid on the interface strength test of apatite coating titanium
Evaluation of the corrosion characteristics of the injection molding machine for SKD61 material
Fatigue strength of pure titanium which has been subjected to shot peening and its mechanism
Evaluation of load applied to the knee brace with a link mechanism
Evaluation of corrosive wear characteristics of the titanium-based metal material that has been subjected to surface design
Torsional fatigue characterization of surface-modified 3D modeling titanium alloy
Evaluation of the fatigue characteristics of the 3D layered manufacturing cobalt chromium alloy
Examination of the low profile of the spinal implant
Influence of microstructure on the fatigue properties of pure titanium employing severe plastic deformation for grain refinement.（
Evaluation of interfacial strength in thin-film coating material for medical use
Evaluation of the distal fixing strength of the intramedullary nail implant
Effect of strength due to laser marking to medical titanium material
Development of lower limb muscle strength measurement equipment
Evaluation of fretting fatigue characteristics of the different medical metal material
Evaluation of torsional fatigue characteristics of the β titanium alloy

(Proposed theme of joint or funded research)
Mechanics characteristics evaluation of medical material

Research Interests

 29

Research Areas

 5

Research History

 4

Committee Memberships

 16
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Awards

 24
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Papers

 112
  • Yuya ARAKI, Noriyuki HISAMORI, Masahiro TSUKAHARA, Yoshitaka MISAKA, Yuji KOBAYASHI, Toshiya TSUJI, Yuta SAITO, Munehisa UCHIYAMA, Makoto YAMAGUCHI
    Nov, 2023  Peer-reviewedCorresponding author
  • Shuta YAMAMURO, Noriyuki HISAMORI, Masahiro SHINZAWA, Yuki KIMURA
    13th International Fatigue Congress(Fatigue2022+1), Nov, 2023  Peer-reviewedCorresponding author
  • Akane YANAGAWA, Noriyuki HISAMORI, Masahiro SHINZAWA, Yuki KIMURA
    13th International Fatigue Congress(Fatigue2022+1), Nov, 2023  Peer-reviewedCorresponding author
  • The Journal of Clinical Spots Medicine, 40(9) 892-897, Sep, 2023  Peer-reviewedLead author
  • 久森紀之
    軽金属, 72(8) 514-519, Aug, 2022  Peer-reviewedInvitedLead author
  • 久森紀之
    軽金属, 71(8) 385-389, Aug, 2021  Peer-reviewedInvitedLead author
  • 久森紀之
    軽金属, 70(8) 373-381, Aug, 2020  Peer-reviewedInvitedLead author
  • 久森紀之, 武井将史
    材料試験技術, 65(2) 86-91, Apr, 2020  Peer-reviewedLead author
  • FUNAKI Motohiro, HISAMORI Noriyuki, MASAKI Kiyotaka, UCHIYAMA Munehisa, YAMAGUCHI Makoto
    The Proceedings of Mechanical Engineering Congress, Japan, 2019 J02329P, 2019  
    Ti alloy and Co-Cr alloy are authorized as implant materials. These alloys are utilized by machining and heat treatment. The manufacturing process will generate residual stresses that influence in destruction and deformation of materials. X-Ray Diffraction (XRD) is one of methods to estimate residual stresses. However, X-ray stress constants K of some alloys have never been reported before. So when residual stresses of some alloys are measured, stress constants of pure metal are used. This case isn’t clear for evaluation of residual stresses. In this study, system to measure X-ray stress constants of alloys were constructed. Specifically, we designed and fabricated a measurement system that can irradiate X-ray to materials under load. It was confirmed that the load was uniformly applied to the test piece. So the result of loading test showed that it is possible to use this apparatus. Next, we thought about a test piece for measuring residual stress with stress constants calculated by the constructed system. Vacuum annealing was performed on the pure titanium powder and the procedure for producing test pieces in a stress-free (strained) state was confirmed.
  • Kiyotaka MASAKI, Noriyuki HISAMORI, Yuji KOBAYASHI, Daisuke GOWA
    13th International Conference on Shot Peening, 18-21, Sep, 2017  Peer-reviewed
  • 政木清孝, 上里優貴, 磯村尚子, 山本広美, 久森紀之
    材料試験技術, 62(2) 131-136, Jul, 2017  Peer-reviewed
  • Takuto IWADE, Noriyuki HISAMORI, Junichi FUJITA, Kenji YAMAYA
    International Journal of Automation Technology, 11(6) 895-901, Jun, 2017  Peer-reviewed
  • Yoshiki Okada, Nobuhiro Abe, Noriyuki Hisamori, Toshiaki Kaneeda, Shigeaki Moriyama, Hitoshi Ohmori, Masayoshi Mizutani, Hiroyuki Yanai, Yoshio Nakashima, Yusuke Yokoyama, Toshifumi Ozaki
    Acta Medica Okayama, 71(1) 49-57, 2017  Peer-reviewed
    Metals have been used clinically as biomaterials, especially in the orthopaedic and dental fields. Metals used as implants wear at contact surfaces, producing metal particles and metal ions that may be harmful. Newly developed metal implants and methods of implant surface modification are currently under scrutiny. We evaluated the use of electrolytic in-process dressing (ELID) as a surface finishing method for metal implants. Metal implants processed using the ELID method (ELID group) or not processed (Non-ELID group) were inserted surgically into rabbit femurs. The rabbits were sacrificed postoperatively over a 24-week period. We assessed the concentrations of the cytokines, interleukin (IL)-1ß, IL-6, and tumor necrosis factor-α, the resistance to implant pull-out, and histopathology at the implant site. There was no significant difference between the groups regarding the cytokine concentrations or implant pull-out resistance. Many particles indicating wear around the implant were noted in the Non-ELID group (n=10) but not the ELID group (n=13), while a fibrous membrane adhering to the every implant was noted in the ELID group. The formation of a fibrous membrane rather than metal particles in the ELID group may indicate improved biocompatibility, and it suggests that ELID may prevent corrosion in the areas of contact.
  • Kiyotaka Masaki, Yuki Yonakuni, Noriyuki Hisamori, Yuichiro Suga, Yuji Kobayashi, Daisuke Gowa
    Zairyo/Journal of the Society of Materials Science, Japan, 65(9) 679-686, Sep 1, 2016  
    Rotating bending loading and axial loading fatigue tests were conducted to investigate the effect of zirconia shot peening on fatigue properties of Ti-6Al-4V ELI alloy. Specimen was treated in three different shot peening conditions. As a result of the rotating bending fatigue tests, the fatigue lives of shot peened specimen were longer life than non-peened specimen. Fish eyes were observed in the fracture surface of the most shot peened specimen. And there was the facet of α-Ti or the fine granular region near the crack initiation site of the fish eye. And then, fracture morphology of shot peened specimens is different by peening conditions. From the result of axial loading fatigue tests, it becomes obvious that the facet of α-Ti was formed by action of tensile stress over 500MPa without compressive stress and that the fine granular region was formed by action of compressive stress. These results suggested that low level tensile residual stress existed at subsurface near the surface of the SP treated specimen, and the residual stress distribution decided on internal crack origin type between the facet of α-Ti or the fine granular region.
  • 政木清孝, 與那國優希, 久森紀之, 須賀祐一郎, 小林裕次, 後和大輔
    材料, 65(9) 679-686, Sep, 2016  Peer-reviewed
  • Kiyotaka MASAKI, Noriyuki HISAMORI, Naoko ISOMURA, Hiromi YAMAMOTO
    13th International Coral Reef Symposium, 19-24, Jun, 2016  Peer-reviewed
  • Takuya Uemura, Masayoshi Mizutani, Noriyuki Hisamori
    24th International Symposium on PROCESSING AND FABRICATION OF ADVANCED MATERIALS(PFAM XXIV), 164-170, Dec, 2015  Peer-reviewed
  • Satoshi Watanabe, Noriyuki Hisamori
    24th International Symposium on PROCESSING AND FABRICATION OF ADVANCED MATERIALS(PFAM XXIV), 385-393, Dec, 2015  Peer-reviewed
  • Sena Uyama, Noriyuki Hisamori
    24th International Symposium on PROCESSING AND FABRICATION OF ADVANCED MATERIALS(PFAM XXIV), 157-163, Dec, 2015  Peer-reviewed
  • Jaehui BANG, Noriyuki HISAMORI, Shuhei HONMA, Kazuki WADA, Yasushi FUKASE
    24th International Symposium on PROCESSING AND FABRICATION OF ADVANCED MATERIALS(PFAM XXIV), 245-252, Dec, 2015  Peer-reviewed
  • MORITA Tatsuro, HISAMORI Noriyuki
    journal of the Japan Society for Testing Materials, 64(3) 242-242, 2015  
  • Noriyuki Hisamori
    Journal of the Society of Mechanical Engineers, 118(1154) 22-25, Jan, 2015  
  • 佐藤圭吾, 久森紀之, 藤田淳一, 山谷健治, 住谷健二
    日本人工関節学会誌, 45 771-772, 2015  Peer-reviewed
  • K. MASAKI, N. HISAMORI, Y. KOBAYASHI, D. GOWA
    The Twelfth International Conference on Shot Peening, 90-95, Sep, 2014  Peer-reviewed
  • Kiyotaka Masaki, Youhei Kameshima, Noriyuki Hisamori, Yuji Sano, Koichi Akita, Takahisa Shobu
    Zairyo/Journal of the Society of Materials Science, Japan, 62(5) 297-304, May, 2013  Peer-reviewed
    In order to investigate the effects of laser peening on high cycle fatigue properties of (α + β) type T1-6A1-4V alloy, rotating bending fatigue tests were carried out. The laser peening conditions were a spot size of 0.8mm in diameter, a pulse energy of 200mJ and an irradiation pulse density of 38 pulse/mm2. The fatigue properties were not improved with these conditions of laser peening; even though the material was hardened to some extent and high level compressive residual stresses were induced in the near-surface layer. Because the reason that the fatigue properties were not improved was considered the notch effect of surface roughness introduced by laser peening, further fatigue tests were performed with laser-peened specimens followed by surface polishing. However, the fatigue lives of polished specimens were shorter than those of unpolished specimens, unexpectedly. Considering the peening effects such as surface roughness, hardness and residual stress, the reasons for arriving at the unexpected results would be the influence of the strain-induced transformation of β phase into α martensite and a larger yield strength in tension than that in compression due to the HCP structure of α phase of titanium alloy. © 2013 The Society of Materials Science.
  • HISAMORI Noriyuki, MATSUKAWA Tatsuya, MIZUTANI Masayoshi, OHMORI Hitoshi, NISHIMURA Naoyuki, TSUNASHIMA Yoshitaka, KURAMOTO Koichi, EZURA Atsushi
    Journal of the Japan Society of Grinding Engineers, 57(4) 235-240, Apr, 2013  Peer-reviewed
    In this study, the ELID (Electrolytic In-process Dressing) polishing process was applied to a Co-Cr alloy that is used in artificial joints. The surface of the material was modified during the polishing process to give improved properties. Corrosion and wear characteristics were evaluated by the pin-on-disk testing method in a pseudo-body fluid environment. We found that a stable modified layer was formed on the surface by the ELID process, leading to improvement of corrosion resistance in friction environments.
  • HISAMORI Noriyuki
    journal of the Japan Society for Testing Materials, 62(6) 396-397, 2013  
  • H. Ohmori, M. Mizutani, T. Kaneeda, N. Abe, Y. Okada, S. Moriyama, N. Hisamori, N. Nishimura, Y. Tsunashima, J. Tanaka, K. Kuramoto, A. Ezura
    CIRP Annals - Manufacturing Technology, 62(1) 579-582, 2013  Peer-reviewedInvited
    The purpose of this paper is to prove the reliability of artificial hip joints' surface generated by the electrolytically treated grinding process the evaluation was carried out in a hip simulator and animal tests. The evaluation indicated that the fabricated hyper-hemispherical shaped artificial hip joints presented a high quality smoother surface than 10 nm in Ra. The fabricated surface also showed its ability to prevent crystalline phase transition during the hip simulation test, suggesting that the stably modified layer was generated via grinding process. The results of animal test showed that the fabricated surface could have a highly-improved biocompatibility. © 2013 CIRP.
  • MIZUTANI Masayoshi, HISAMORI Noriyuki, MIZUNO Takafumi, EZURA Atushi, OHUCHI Ikuo, OHMORI Hitoshi, FUJIWARA Kunihiko, DOI Kenji, KURAMOTO Koichi
    Journal of the Japan Society of Grinding Engineers, 56(3) 184-189, Mar, 2012  Peer-reviewed
    The purpose of this study was to evaluate the surface properties and corrosion behavior of Co-Cr alloys ground by Electrolytic In-process Dressing (ELID) grinding. This evaluation was carried out by abrading the alloy surfaces using ultra high molecular weight polyethylene (UHMWPE). The evaluation results showed that ELID grinding can be used to perform mirror finishing on Co-Cr alloys. ELID grinding was also applicable to create a stable modified layer, which improves corrosion wear characteristics on the workpiece surface.
  • Yukito Hagihara, Takato Shobu, Noriyuki Hisamori, Hiroshi Suzuki, Ken-ichi Takai, Keiji Hirai
    ISIJ INTERNATIONAL, 52(2) 298-306, 2012  Peer-reviewed
    The delayed fracture characteristics of V-bearing steel were evaluated using conventional strain rate test (CSRT) and the hydrogen absorption and desorption behaviors were studied with the specimens hydrogen-charged and then exposed to air of 30 degrees C for up to 2.5 months. CSRT was carried out at two test sites, and nearly the same delayed fracture resistance was obtained for the V-bearing steel. The fracture appearance changed from quasicleavage to intergranular with increasing hydrogen content. The hydrogen content of the boundary between fracture appearances was approximately 4 mass ppm. The hydrogen introduced into the V-bearing steel was composed of a diffusible one which decreased in concentration in 24 h when exposed to air of 30 degrees C, and two types (weakly and strongly) of trapped ones. The strongly trapped hydrogen remained in the specimen after 2.5 months of exposure in air. By analyzing the thermal desorption profiles with Gaussian function, the peak temperatures of these hydrogen types were 100 degrees C, 167 C and 198 degrees C, corresponding to diffusible, weakly and strongly trapped hydrogen, respectively. The hydrogen-charged specimens of more than 4 mass ppm were fractured in the intergranular mode. After exposure in air and the hydrogen content became less than 4 mass ppm, the fracture mode changed to quasicleavage. After recharging the hydrogen to more than 4 mass ppm, the fracture mode became intergranular again.
  • Yukito Hagihara, Tsuyoshi Oba, Noriyuki Hisamori, Hiroshi Suzuki, Ken-ichi Takai
    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 97(12) 623-630, Dec, 2011  Peer-reviewed
    Plastic strain takes place at the bottom of the thread, when fastening force is applied to the high strength bolts. The effect of plastic strain on the delayed fracture characteristics was studied using conventional strain rate test (CSRT). For this purpose two kinds of methods were used in the experiments: one is applying uniform plastic strain to the specimen before machining notch and the other is preloading of notched round bar (NRB) specimen. The hydrogen content increased as increasing plastic strain and in contrast, the relationship between fracture stress and hydrogen content using CSRT was independent of plastic strain, which indicates that plastic strain increases hydrogen content and results in decreasing fracture stress based on the above-mentioned relation. On the contrary, the preloading affected the fracture nominal stress obtained by CSRT of hydrogen prechargeci NRB specimen. Using finite element stress analysis, the maximum stress ahead of the notch tip for preloaded NRB specimen was obtained. The relationship between the fracture maximum stress and hydrogen concentration becomes unique irrespective preloading. It is concluded that the relation of local maximum stress the hydrogen concentration at the delayed fracture initiation site is the material constant and control delayed fracture.
  • Shobu Takahisa, Akita Koichi, Shiro Ayumi, Fujishiro Tomoyuki, Kiriyama Koji, Kumagai Masayoshi, Hisamori Noriyuki
    3rd International conference on laser Peening and Related Phenomena, Oct, 2011  Peer-reviewed
  • Yukito Hagihara, Takato Shobu, Noriyuki Hisamori, Hiroshi Suzuki, Ken-ichi Takai, Keiji Hirai
    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 97(3) 143-151, Mar, 2011  Peer-reviewed
    The delayed fracture characteristics of V-bearing steel were evaluated using the CSRT method, and the hydrogen trapping and de-trapping behavior was studied with the specimens hydrogen-charged and then held in air for up to 2.5 months. The CSRT tests were carried out at two test sites and nearly the same delayed fracture characteristics were obtained using the V-bearing steel. The fracture appearance changed from quasi-cleavage to inter-granular fracture with an increase of hydrogen content. The boundary hydrogen content of the fracture appearance change is around 4 mass ppm. The hydrogen charged in V-bearing steel was composed of diffusible one, which comes out in 24 h when held in air of 30 degrees C and two kinds of (weakly and strongly) trapped ales. The strongly trapped hydrogen remained in specimen after 2.5 months held in air. By analyzing the thermal desorption profiles with Gaussian function, the peak temperatures of these hydrogen were 100 degrees C, 167 degrees C and 198 degrees C, which corresponds to diffusible, weakly and strongly trapped hydrogen. The specimens hydrogen-charged more than 4 mass ppm were fractured in inter-granular mode. After held in air and the hydrogen comely: became less than 4 mass ppm the fracture mode changed to quasi-cleavage. Re-charging the hydrogen more than 4 mass ppm, the fracture mode became inter-granular again.
  • M. Mizutani, N. Hisamori, T. Mizuno, A. Ezura, I. Ohuchi, H. Ohmori, K. Fujiwara, K. Doi, K. Kuramoto
    ADVANCES IN ABRASIVE TECHNOLOGY XIV, 325 201-+, 2011  Peer-reviewed
    The purpose of this paper is to evaluate the surface properties and corrosion behavior of Co-Cr alloys ground by employing Electrolytic In-process Dressing (ELID) grinding; this evaluation was carried out by abrading the alloy surfaces using ultra high molecular weight polyethylene (UHMWPE). The evaluation results showed that ELID grinding can be used to perform mirror finishing on Co-Cr alloys. ELID grinding also showed its ability to create a stable modified layer which improves corrosion wear characteristics on the workpiece surface.
  • 久森紀之
    チタン, 58(4) 26 (312), Apr, 2010  
  • KAMESHIMA Yohei, MASAKI Kiyotaka, HISAMORI Noriyuki, SANO Yuji, AKITA Koichi, OCHI Yasuo
    The proceedings of the JSME annual meeting, 2010 125-126, 2010  
    In order to investigate the effects of surface polishing for high cycle fatigue property on the laser peened Ti-6Al-4V specimen, the rotating bending fatigue test were carried out with three kinds of the electrical polished(EP) specimen, mechanical polished(MP) specimen and MEP specimen was polished with both polishing. As the results, the fatigue limits of polished specimens were not improved and the fracture surfaces showed characteristic appearance.
  • Noriyuki Hisamori
    Journal of the Society of Inorganic Materials, Japan, 16(339) 112-117, Mar, 2009  
  • HISAMORI Noriyuki, NAKAMURA Satoshi, FUJIWARA Kunihiko, SUGINO Atsushi, DOI Kenji, KURAMOTO Kouichi
    The proceedings of the JSME annual meeting, 2009 265-266, 2009  
    Two types of notched specimen of Ti-6Al-4V simulated screw configuration were prepared and cyclic fatigue test was performed in air to study fatigue property of titanium screw. Effect of heat-treatment on fatigue strength was also investigated. As a result, the specimen having a smaller notch diameter showed higher fatigue strength (N_f=10^7) than that of larger one. This result indicates that fatigue strength of notched screw can be organized with its stress concentration factor. Heat-treatment improves tensile and fatigue strength, but, endurance ratio (fatigue strength/tensile strength) become lower compared as-received materials, which supports the idea that heat-treatment affected strongly to the tensile strength not to the fatigue properties.
  • MIZUTANI Masayoshi, MIZUNO Takafumi, HISAMORI Noriyuki, OHMORI Hitoshi
    The proceedings of the JSME annual meeting, 2009 299-300, 2009  
    Cobalt-Chromium (Co-Cr) alloys possess outstanding corrosion resistance and wear resistance because of passive film of a few nanometers' thickness on their surfaces. In this study, we have clarified the damage accumulation mechanism of Co-Cr alloys under the simultaneous reaction of corrosion and wear in sodium chloride solution. A corrosion wear characteristic of these alloys was evaluated by static polarization test under simultaneous wear damage. Wear was applied using a reciprocating rotational pin-on-flat abrasion machine. The pin material in all tests was polyethylene. Applied loads were 9.8 N. The disk rotation sliding rates were 10, 1.0, and 0.1 mm/s. The results show the current density increases significantly early only when the sliding rate is 10 mm/s. This is thought to occur because the wear on the passive film affects the corrosion reaction. The results also show that the current density drops (recovers) over time and approaches the Control. Therefore, if you assume the prolonged use of implants, the sliding rate in early use greatly affects the corrosion reaction.
  • Yukito Hagihara, Chikahito Ito, Daizen Kirikae, Noriyuki Hisamori, Hiroshi Suzuki, Kenichi Takai
    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, 95(6) 489-497, 2009  
    Synopsis: The delayed fracture characteristics of steels are expressed by the relationship between the maximum fracture stress and the hydrogen content at the notch tip of circumferentially notched round bar specimen, where delayed fracture initiates. This material constant is easily obtained by CSRT (Conventional Strain Rate Technique) method. The CSRT tests with the notch tip radius of 0.1, 0.25 or 0.8 mm were carried out on the high strength steel having 1300 MPa in tensile strength. Based on the probabilistic and statistical evaluation of the CSRT test results, the specimen with the notch root radius of 0.25 mm gives stable and average results of all experiments. Moreover, this notch geometry has the comparable stress concentration factor to the bottom of the actual bolt screw and easily machined with high accuracy. From these points of view the 0.25 mm radius notch is considered to become the standard specimen geometry. The scattering of delayed fracture characteristics was evaluated by applying the P-S-N method of fatigue test and the P-S-H method was demonstrated.
  • 久森紀之
    日本機械学会誌, 111(1077) 17-18, Dec, 2008  
  • 久森紀之
    材料, 57(10) 1074, Oct, 2008  
  • Noriyuki Hisamori, Jun Komotori
    8th World Biomaterials Congress 2008, Jun, 2008  
  • Yukito Hagihara, Chikahito Ito, Noriyuki Hisamori, Hiroshi Suzuki, Kenichi Takai, Eiji Akiyama
    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 94(6) 215-221, 2008  
    A conventional strain rate technique (CSRT) to evaluate the delayed fracture characteristics of high strength steels has been proposed. The critical "maximum stress-diffusible hydrogen concentration" at the delayed fracture initiation point near the notch tip is thought to be a material constant, which was originally demonstrated using the SSRT (slow strain rate technique) test method. The SSRT method takes hours to complete the test and uses a special test machine, which causes difficulty and complication. Therefore, a simple and conventional test technique, CSRT test method for delayed fracture was investigated. The crosshead speed is around 1 mm/min, so that the stress induced diffusion of hydrogen is negligible. The results obtained are as follows. (1) Since the stress induced hydrogen diffusion does not take place during the CSRT test, it is necessary to introduce the amount of hydrogen in the specimen, corresponding to the accumulated hydrogen at the vicinity of the notch tip region in the SSRT test. The electrochemical hydrogen charging conditions were established to introduce a wide range of hydrogen contents into the specimens. (2) A unique relationship between the maximum stress at the vicinity of the notch tip and hydrogen contents was obtained irrespective of the notch configuration using the CSRT test and FEM stress analysis. Therefore, it can be said that this relation is the material constants for delayed fracture.
  • Noriyuki HISAMORI, Jun KOMOTORI, Akiko NAKAJIMA
    Ti-2007 science and technology : proceedings of the 11th World Conference on Titanium (JIMIC5) held at Kyoto International Conference Center, Kyoto, Japan, 3-7June 2007, 1221-1224, Dec, 2007  
  • Yukiko MATSUMURA, Hirokatsu SUGAWARA, Jun KOMOTORI, Noriyuki HISAMORI
    Ti-2007 science and technology : proceedings of the 11th World Conference on Titanium (JIMIC5) held at Kyoto International Conference Center, Kyoto, Japan, 3-7June 2007, 1553-1556, Dec, 2007  
  • Jun Komotori, Noriyuki Hisamori, Yosuke Ohmori
    WEAR, 263(1–6) 412-418, Sep, 2007  
    Titanium and its alloys are currently in use as implant materials for orthopaedic surgery. These materials possess outstanding corrosion resistance due to a dense and passive oxide film on the surface. When these alloys are implanted in a living body, removal of surface material takes place because of mechanical wear and corrosion. Simultaneous chemical and mechanical effects also limit long-term use of such materials. The aim of the present study is to clarify the damage accumulation mechanism of Ti-6Al-4V alloys under the simultaneous reaction of corrosion and wear. For this purpose, we developed a new tribocorrosion system and then evaluated corrosion wear characteristics of the alloys with special attention focused on the effects of scratching rate on repassivation behavior. Two types of corrosion wear tests were carried out: one was the free corrosion potential measurement and the other was the potentiostatic polarization test both with simultaneous application of wear damage. In corrosion wear environment, a transition of wear type from abrasive to adhesive was observed with increase of the scratching rates. Higher scratching rate prevented regeneration of passive films on worn surfaces, resulting in generation of relatively large corrosion pits and a change in the wear mechanism. These results suggested that the scratching rate was an important factor affecting the damage accumulation process. (C) 2007 Elsevier B.V. All rights reserved.
  • HISAMORI NORIYUKI, Jun KOMOTORI, Noriyuki HISAMORI, Yousuke OHMORI
    The 16th International Conference on Wear of Materials, 116-119, Apr, 2007  
  • FUJIMAKI Kouji, HISAMORI Noriyuki, HAGIHARA Yukito
    The proceedings of the JSME annual meeting, 2007 303-304, 2007  
    A material for medical application is required to have extended sustainability of mechanical strength together with fast bone replacement ability in human body. Composite material is preferred in the application because monolithic material does not meet the requirement. In this study, we have developed HAp/TCP composite. The mechanical property of the material is evaluated by the bending strength test. The bone replacement ability is evaluated by soaking the material in simulated body fluid (SBF). Measured result of concentration of Ca^<2+> ion in SBF indicated that the developed material has excellent bone replacement ability. The bending strength is maintained after I week of soaking in SBF due to precipitation of HAp on the surface proceeding to degrease of the strength at early stage of soaking due to dissolution of TCP.
  • MIZUNO Takafumi, HISAMORI Noriyuki, HAGIHARA Yukito
    The proceedings of the JSME annual meeting, 2007 301-302, 2007  
    Cobalt-Chromium alloys possess outstanding corrosion resistance and wear resistance because of passive film of a few nanometers' thickness on their surfaces. In this study, we have clarified the damage accumulation mechanism of Co-Cr alloys under the simultaneous reaction of corrosion and wear in sodium chloride solution. We developed a new tribocorrosion system. A corrosion wear characteristic of these alloys was evaluated by the anodic polarization test, static polarization test, and natural potential test under simultaneous wear damage. Large corrosion pits and changes in wear form were observed on their surfaces.

Misc.

 57
  • 久森紀之
    レーザ協会誌, 41(2) 20-27, Feb, 2017  Peer-reviewedInvited
  • MASAKI Kiyotaka, ISOMURA Naoko, YAMAMOTO Hiromi, HISAMORI Noriyuki
    2016(69) 115-116, Mar 15, 2016  
  • BANG Jaehui, HISAMORI Noriyuki, HONMA Shuhei, WADA Kazuki, FUKASE Yasushi
    2015 "GS0607-427-1"-"GS0607-427-3", Nov 21, 2015  
    Barrel, nozzle and screw are plasticization parts of injection molding machines that works under high processing temperature. These parts are also exposed to corrosive gas and acid environment came from molten plastics. These combined factors cause considerable corrosion damage on plasticization parts. Furthermore, frictions with glass-filled polymers in molten plastic give rise to wear damages simultaneously on plasticization parts. In this study, the electrochemical test has been conducted on SKD61 specimens in the solute H_2SO_4 dissolving nylon66-25wt.% fiberglass. It was found that oxide film formation was promoted due to the oxidation reaction between SKD61 surface and the solution while the regenerative ability of the oxide film of SKD61 was deteriorated. The corrosion wear test was also conducted by using Alumina ceramics ball on SKD61 disk specimens. Destruction of the oxide film of SKD61 due to friction was confirmed. The regenerative ability of oxide film was also verified in the test.
  • MOCHIZUKI Ryota, HISAMORI Noriyuki, GOWA Daisuke, KOBAYASI Yuji
    2015 "OS1313-426-1"-"OS1313-426-3", Nov 21, 2015  
    Shot peening (SP) is one of the surface modification technologies to enhance fatigue strength. In this study, the mechanism of enhancement of bending fatigue property of shot peened pure titanium (JIS 2) was investigated. Surface roughness, vickers hardness of surface and subsurface, and bending fatigue strength was measured. Surface roughness and hardness of surface and subsurface were increased by SP. The bending fatigue strength was increased highly by SP because increasing of hardness effected more greatly than increasing of surface roughness. The maximum of amount of increase 2.7 times in 10^7 cycles. It was found that the bending fatigue strength was increased by increasing of hardness of surface and subsurface by SP. Therefore, it is obvious that fatigue strength of pure titanium is increased highly by SP.
  • WATANABE Satoshi, HISAMORI Noriyuki
    2015 "OS1314-447-1"-"OS1314-447-3", Nov 21, 2015  
    Torsion fatigue tests were conducted for circumferentially notched bars specimens of Ti-6Al-4V alloy to evaluate fatigue strength. The notch sensitivity was studied by using blunt (stress concentration factor Kt=2.0) and sharp (Kt=4.0) notched specimens. The number of cycles to failure was obtained and the crack initiation life was estimated from the applied torque to the specimens. The number of cycles to failure and fatigue strength decreased with increasing the value of stress concentration factor. When compared at the same fatigue life, the crack initiation life of Kt=4.0 specimen was much shorter than that of Kt=2.0. The crack propagation behaviors were analyzed by observing fractured surface. When stress amplitude is low, the tensile crack propagated toward a 45° direction of the longitudinal axis of the specimen, while under high stress amplitude, the shear crack propagated in the circumferential direction both in blunt and sharp notched specimens forming flat fracture surface. The fracture surface showed factory-roof pattern under middle stress amplitude. The angle of a fracture plane of the blunt notch under low stress amplitude was 45° to the axial direction. The formation of factory-roof may increase contact areas in the fractured surface, thus increase crack propagation life.
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  • Sep, 2018 - Sep, 2018
    これから疲労設計に携わろうとする若手技術者，新たに耐疲労設計を必要とする技術者や疲労研究を従事する大学院生など，いわゆる疲労に関する初心者を対象に，疲労の基礎的知識から具体的な設計の初歩を講述する講習会
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    これから疲労設計に携わろうとする若手技術者，新たに耐疲労設計を必要とする技術者や疲労研究を従事する大学院生など，いわゆる疲労に関する初心者を対象に，疲労の基礎的知識から具体的な設計の初歩を講述する講習会
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  • Aug, 2015 - Sep, 2015
    これから疲労設計に携わろうとする若手技術者，新たに耐疲労設計を必要とする技術者や疲労研究を従事する大学院生など，いわゆる疲労に関する初心者を対象に，疲労の基礎的知識から具体的な設計の初歩を講述する講習会
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