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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
  • Noriyuki Hisamoria, Yukito Hagihara
    PROGRESSES IN FRACTURE AND STRENGTH OF MATERIALS AND STRUCTURES, 1-4, 353-358 2219-2222, 2007  
  • Noriyuki Hisamori, Megumi Kimura, Hikaru Morisue, Morio Matsumoto, Yoshiaki Toyama
    INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 20(25-27) 3567-3572, Oct, 2006  
  • HISAMORI Noriyuki, YOSHIDA Kotarou, HAGIHARA Yukito
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2006 375-376, 2006  
  • YAMAGA Aiki, HISAMORI Noriyuki, HAGIHARA Yukito
    The proceedings of the JSME annual meeting, 2006 459-460, 2006  
    A bone-like composite that is composed of HA and collagen protein is reported to be bioactive and enhance bone growth. We have reported HA/Col. composite with precipitation method had been replaced by bone within 8 weeks. However, this composite is difficult to have sufficient mechanical property and formability. In this study, we have developed a composite that has improved formability by adding CMC gel to HA/Col. Mechanical property of this composite was evaluated by compressive strength test. Bioactivity was evaluated by soaking the composite in simulated body fluid. Results of measuring Ca^<2+> concentration in SBF after soaking indicate possibility of the bioactivity.
  • KAMEYAMA Yutaka, MATSUI Yutaka, KOMOTORI Jun, HISAMORI Noriyuki
    The proceedings of the JSME annual meeting, 2006 439-440, 2006  
  • IMAYOSHI Shoichi, HISAMORI Noriyuki, HAGIHARA Yukito
    The proceedings of the JSME annual meeting, 2006 447-448, 2006  
    The damage accumulation mechanism of Ti-6Al-4V alloy under simultaneous corrosion and fatigue was studied. Corrosion fatigue characteristics of the alloy were evaluated by using newly developed corrosion-fatigue system, with special attention to synergetic effects of corrosion and fatigue on repassivation behavior. Two types of corrosion fatigue tests, potentiostatic polarization test with fatigue damage and free corrosion potential measurement test with simulataneous application of fatigue were carried out. In corrosion fatigue test, the electric current density increased as the frequency of fatigue became higher. This is caused by surface corrosion reaction occurred with development of cracks. However, the number of cycle to failure did not change with the frequency of fatigue. Therefore, it was shown that fatigue does not influence the corrosion fatigue damage. It was also shown that titanium alloy was superior in corrosion resistance.
  • NAKAMURA Satoshi, HISAMORI Noriyuki, HAGIHARA Yukito, SUGINO Atsushi, TAKAHASHI Hiroyuki, DOI Kenji
    The proceedings of the JSME annual meeting, 2006 449-450, 2006  
    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.
  • HISAMORI NORIYUKI
    Orthopaedic ceramic implants, 25 37-45, 2006  
  • Yosuke Ohmori, Jun Komotori, Noriyuki Hisamori, Byungjun Lee
    Zairyo/Journal of the Society of Materials Science, Japan, 54(9) 940-945, Sep, 2005  
  • 久森紀之, 合田秀之
    材料試験技術, 50(3) 147-153, Jul, 2005  
  • Noriyuki Hisamori, Yutaka Takano, Kenichi Takai
    Zairyo/Journal of the Society of Materials Science, Japan, 54(7) 748-753, Jul, 2005  
  • IMAYOSHI Shoichi, HISAMORI Noriyuki, HAGIHARA Yukito
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2005 473-474, 2005  
  • HISAMORI Noriyuki, HAGIHARA Yukito
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2005 331-332, 2005  
  • KUGIMARU Hiroshi, HISAMORI Noriyuki, HAGIHARA Yukito
    The proceedings of the JSME annual meeting, 2005 449-450, 2005  
    Compact tension specimen of hydroxyapatite ceramics (HAp) was prepared and cyclic corrosion fatigue test was performed in air, deionized water and simulated body fluid (SBF) to investigate the corrosion fatigue property of HAp. The environment where corrosion fatigue strength (N_f=10^7) was the lowest was deionized water environment. Subsequently was SBF environment, air environment. Corrosion fatigue fracture was observed with scanning electron microscope (SEM) to clarify this mechanism. As a result, as for the corrosion fatigue fracture configuration, fracture in transgranular was observed with high stress condition. On the other hand, intergranular fracture was observed with low stress condition. That is to say, it was stress dependence type with a short life time of case, and it was environment dependence type with a long life time of case. In addition, two corrosion fatigue fracture configuration was observed to SBF environment when soak was done for a long time. The fracture surface which intergranular fracture and apatite precipitated surface was observed. By the time that apatite precipitated, improvement of fracture stress was shown in a SN curve. Therefore, it was shown that corrosion fatigue strength had higher on SBF environment than deionized water environment
  • YOSHIDA Koutarou, HISAMORI Noriyuki, HAGIHARA Yukito, UMEDA Tomohiro
    The proceedings of the JSME annual meeting, 2005 451-452, 2005  
    The study made an artificial bone of calcium phosphate bone cement and the new composites materials that content collagen and apatite. In addition, a microstructure change and crystal structure change to simulated body fluid environment were evaluated. Evaluated a compressive strength examination of the composites materials that did soak in simulated body fluid environment. In the case of the composites materials which collagen and apatite were content many in, the calcium phosphate bone paste changed in apatite easily. However, compressive strength is extremely low collagen of organic matter influences this thing. Therefore, increase quantity of collagen and apatite when considered that it changes to a bone. In other words it became clear with quantity of addition of collagen and apatite that control of a mechanical properties was possible.
  • HISAMORI NORIYUKI
    ADVANCED MATERIALS DEVELOPMENT & PERFORMANCE CONFERENCE, 54 323-324, 2005  
  • 久森紀之, 藤井大輔, 高井 健一
    材料試験技術, 49(3) 171-176, Jul, 2004  
  • HSAMORI Noriyuki, NOJIRI Yuu, TAKAI Kenichi
    Journal of the Society of Materials Science, Japan, 53(4) 417-423, Apr, 2004  
  • HISAMORI Noriyuki, UMEDA Satoshi, TAKAI Kenichi, HAGIHARA Yukito, MORISUE Hikaru, MATSUMOTO Morio, TOYAMA Yoshiaki
    The proceedings of the JSME annual meeting, 2004 313-314, 2004  
    Pure titanium and titanium alloy are generally used as orthopaedic implants like total hip arthroplasty because of its high strength and high biocompatibility. Stability of bone-implant interfacial bonding is a critical factor for successful total hip arthroplasty. Because of the problems of loosening and dissolution of harmful ion with cemented techniques, alternative cement-less fixation of the total hip arthroplasty has been developed. Plasma spray coating of bone-like apatite is an example to add strong bonding capability with bone to metallic materials. However, this physical coating treatment shows weak base-coating bonding strength and difficult to apply on irregular surface. Chemical treatments do not have such drawbacks. The alkali-heat treatment method, developed by Kokubo et al, is a kind of chemical treatment to enhance the bone-bonding strength of pure titanium. This technique involves soaking the implant in an alkali solution and subsequent heating, resulting in a strong bone-bonding ability and a high bone affinity. This study transplants alkali heat treated titanium alloy on the rabbit femoral bone and examined in vivo interfacial bonding strength.
  • HISAMORI Noriyuki, UEDA Satoshi, TAKAI Kenichi, HAGIHARA Yukito
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2004 145-146, 2004  
  • KUGIMARU Hiroshi, HISAMORI Noriyuki, TAKAI Kenichi, HAGIHARA Yukito
    The proceedings of the JSME annual meeting, 2004 125-126, 2004  
    Compact tension specimen of hydroxyapatite ceramics (HAp) was prepared and cyclic fatigue test was performed in air, deionized water and simulated body fluid (SBF) to investigate the fatigue property of HAp. The environment where fatigue limit stress (N_f=10^7) was the lowest was deionized water environment. Subsequently was SBF environment, air environment. Fatigue fracture was observed with scanning electron microscope (SEM) to clarify this mechanism. As a result, as for the fatigue fracture configuration, fracture in transgranular was observed with high stress condition. On the other hand, intergranular fracture was observed with low stress condition. That is to say, it was stress dependence type with a short life time of case, and it was environment dependence type with a long life time of case. In addition, two fatigue fracture configuration was observed to SBF environment when soak was done for a long time. The fracture surface which intergranular fracture and apatite precipitated surface was observed. By the time that apatite precipitated, improvement of fracture stress was shown in a S-N curve. Therefore, it was shown that fatigue limit stress had higher on SBF environment than deionized water environment.
  • Noriyuki Hisamori, Yuji Maruyama, Kenichi Takai
    Zairyo/Journal of the Society of Materials Science, Japan, 53(1) 101-107, 2004  
  • A. Nakajima, Y. Goto, J. Komotori, HISAMORI NORIYUKI
    7th world biomaterials congress 2004 : transactions : held May 17-21, 2004 : Sydney, Australia. : May 2004, Sydney, Australia, 809, 2004  
  • HISAMORI NORIYUKI, Ueda, S, Takai, K, Aizawa, M, Morisue, H, Matsumoto, M, Toyama, Y
    7th world biomaterials congress 2004 : transactions : held May 17-21, 2004 : Sydney, Australia. : May 2004, Sydney, Australia, 1762, 2004  
  • HISAMORI NORIYUKI
    Advances in experimental mechanics : proceedings of the 12th International Conference on Experimental Mechanics, 50-51, 2004  
  • HISAMORI NORIYUKI
    Orthopaedic ceramic implants : proceedings of Japanese Society of Orthopaedic Ceramic Implants, 23/24(24) 85-94, 2004  
  • Y Niki, H Matsumoto, Y Suda, T Otani, K Fujikawa, Y Toyama, N Hisamori, A Nozue
    BIOMATERIALS, 24(8) 1447-1457, Apr, 2003  
  • HISAMORI Noriyuki, TAKANO Yutaka, TAKAI Kenichi
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2003 699-700, 2003  
  • HISAMORI Noriyuki, KIMURA Megumi, TAKAI Kenichi
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2003 191-192, 2003  
  • HISAMORI Noriyuki, TAKANO Yutaka, TAKAI Kenichi
    The proceedings of the JSME annual meeting, 2003 307-308, 2003  
    Apatite ceramics were bonds to living bone through an apatite layer that is formed on its surface in the body. It has been confirmed by SEM observation and thin film X-ray diffraction that the apatite layer can be reproduced on the surface of the hydroxyapatite ceramics even in an a cellular simulated body fluid with ion concentrations nearly equal to those of human blood plasma. In this study, we examined a static fatigue characteristic of hydroxyapatite ceramics. Examination environment is as follows, in simulated body fluid environment and laboratory environment. As a result, in SBF environment was inferior to the laboratory environment in the static fatigue characteristic. That it was trans-granular fracture was observed than static fatigue fracture side observation results in SBF environment of the specimen. It was inter-granular fracture in laboratory environment. A difference of such a fracture configuration has an influence on a static fatigue characteristic.
  • HISAMORI NORIYUKI
    9th Int. Conf. on the Mechanical Behavior of Materials, Y5, 2003  
  • HISAMORI NORIYUKI
    Orthopaedic ceramic implants, 22(11) 9-17, 2003  
  • 久森 紀之
    JCOSSAR, 5 151-156, 2003  
  • 久森 紀之
    膝, 28(2) 28-31, 2003  
  • 久森紀之, 末益博志, 郷津勝久
    材料試験技術, 47(4) 224-230, Oct, 2002  
  • HISAMORI Noriyuki, TAKAI Kenichi, MATSUMOTO Morio, TOYAMA Yoshiaki
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2002 753-754, 2002  
  • KUSANAGI Yukinori, HONMA Saho, HISAMORI Noriyuki, TAKAI Kenichi, NOZUE Akira
    The proceedings of the JSME annual meeting, 2002 389-390, 2002  
    Metallic materials are widely used for orthopedic implants like artificial hip joints that bear high loads throughout its use. However, they are not capable of bonding directly to living bone. This problem will be solved if the metallic material forms hydroxyapatite (HAp) on its surface enabling living bone to bond to the metal. In this study we tried to evaluate fatigue crack propagation properties of bone-induced Ti-6Al-4V alloys in simulated body fluid (SBF), which simulates the human blood plasma in terms of ion concentrations. Bone-inducing function was added on Ti-6Al-4V alloys by coating HAp through surface treatment The fatigue crack propagation test of bone-induced Ti-6Al-4V alloys was performed under a SBF environment at 37℃. The result of the fatigue test is analyzed in terms of the fatigue crack extension rate (da/dN) vs. the stress intensity factor plots (&lrtri;k). At stable crack propagation filed in the da/dN- &lrtri;k curve, the crack propagation rates of the HAp coated Ti-6Al-4V alloys and alkali-heat treatment Ti-6Al-4V alloys specimens were higher than the Ti-6Al-4V alloys without the coating. This difference is possibly caused by the stress corrosion cracking (SCC). The SEM observations of fatigue fracture surface during stable crack extension showed the evidence of SCC that occurs during fatigue crack extension in SBF environment that is observe in the coated Ti-6Al-4V and Alkali-Heat Treatment Ti-6Al-4V alloys specimens.
  • 松本守雄, 千葉一裕, 丸岩博文, 中村雅也, 西澤隆, 戸山芳昭, 久森紀之, 鈴木啓史, 野末章
    日本脊椎脊髄病学会, 13(1) 212-217, Jan, 2002  Peer-reviewed
  • HISAMORI NORIYUKI, A NOZUE, M AIZAWA, H SUEMASU
    ECF14: fracture mechanics beyond 2000: proceedings of the 14th Biennial Conference on Fracture - ECF14, held in Cracow, Poland, 8-13 September,2002, under auspices of the European Structural Integrity Society and American Society for Testing and Materials, 1(A(1)) 683, 2002  
  • HISAMORI NORIYUKI
    European Fracture mechanics, 1(1) 683, 2002  
  • HISAMORI NORIYUKI
    Biological and Medical Engineering, 12 175, 2002  
  • Noriyuki HISAMORI, Akira NOZUE, Mamoru AIZAWA, Hiroshi SUEMASU
    Tissue Engineering, 7(5) 635-674, Oct, 2001  
  • HISAMORI Noriyuki, KOMOTORI Jun, LEE Byung-Jun, DEARNLEY P.A
    Journal of Japanese Society for Biomaterials, 19(4) 3-13, Aug, 2001  
  • 久森紀之, 野末章, 河野晃伸
    材料試験技術, 46(3) 147-153, Jul, 2001  
  • HISAMORI NORIYUKI
    The Society of Material Science JAPAN, 50(5) 558, May, 2001  
  • FUJII Daisuke, HISAMORI Noriyuki, NOZUE Akira, AIZAWA Mamoru, SUEMASU Hiroshi
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2001 275-276, 2001  
  • HISAMORI Noriyuki, NOZUE Akira
    Proceedings of the 1992 Annual Meeting of JSME/MMD, 2001 529-530, 2001  
    The number of aged person is increasing having a disease for bone, tooth and innards. So the necessity of these substitute materials must be increasing. Alumina ceramics are used for substitute materials as bonehead of a thighbone joint, because of its high strength and bio-inert properties. For many biomaterials a fracture occurs due to both corrosion and fatigue. In this study, effects of similar body fluid (SBF) environment on mechanical properties and microstructure of Al_2O_3 were investigated. Microstructural changes of Al_2O_3 ceramics due to SBF corrosion degradation were also examined by scanning electron microscope after long time immersion into SBF at 37℃. Degradation of bending strength and fracture toughness (K_C) were evaluated.
  • Noriyuki Hisamori, Akira Nozue, Yujm Kimura
    Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 67(657) 844-851, 2001  
  • HISAMORI NORIYUKI
    Materials science for the 21st century, B 265-268, 2001  
  • HISAMORI NORIYUKI
    2001  

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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Books and Other Publications

 6
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Presentations

 33
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Professional Memberships

 16
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Research Projects

 22
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Industrial Property Rights

 7
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Social Activities

 5

Other

 22
  • 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
  • Aug, 2017 - Aug, 2017
    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
  • Sep, 2016 - Sep, 2016
    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
  • Apr, 2015 - Mar, 2016
  • 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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