研究者業績
基本情報
- 所属
- 上智大学 理工学部機能創造理工学科 教授
- 学位
- 博士（工学）(工学院大学)
- 連絡先
- hisamori
sophia.ac.jp - 研究者番号
- 80317510
- J-GLOBAL ID
- 200901033684274272
- researchmap会員ID
- 1000293757
1999年－現在 上智大学理工学部機能創造理工学科久森研究室 高度医療技術に用いる生体機能材料について研究中
1999年－現在 上智大学理工学部機能創造理工学科久森研究室 環境強度および破壊力学に基づく構造物の安全安心性について研究中
近年，我が国における高齢化は，骨や関節軟骨などの変性による骨粗鬆症，変形性脊椎症，変形性関節症などの運動機能の疾患を増加させている．そのため，健康で豊かな生活の質の向上を目的に，スポーツを取り入れた生活習慣が広く普及しつつある．しかし，その活動人口の増加や高齢化に伴い，骨折，靱帯損傷，軟骨損傷などの運動器外傷もまた増加している．このような運動器疾患の治療は，今後の医療の大きな課題の一つであり，運動器の性状，形態，物理的特性などをできる限り元の生理的な状態に戻すことが重要である．そこで，骨，軟骨，靱帯，関節を代替する材料を対象に医学と理工学の境界領域について生体材料工学の観点から研究活動を行っている．
(研究テーマ)
日本学術振興会未来開拓学術研究推進事業次世代プロセス技術
生体用チタン合金の疲労特性評価
チタン合金製医療用スクリューの切欠き形状が疲労特性に及ぼす影響
Ti-6Al-4V合金の腐食挙動に及ぼす塑性ひずみと応力負荷の影響
応力が負荷されたチタン合金の細胞培養下での電気化学的特性の評価
Co-Cr合金の腐食摩耗損傷の評価
医療用β型チタン合金の腐食疲労特性
金属系バイオマテリアルの表面改質が生体に及ぼす影響
生体用アパタイトセラミックスの破壊特性
擬似体液中におけるアパタイト(HAp)セラミックスとその表面に形成されたHAP層の微細構造とその機能
有機－無機ハイブリッドバイオコンポジットの創製と生体機能評価
医療用チタン合金の表面改質技術による疲労寿命向上の構築
切欠きを有するβ型チタン合金の疲労特性評価
円孔を有するチタン合金の疲労特性評価
円孔を有するSUS316L鋼の疲労特性評価
3D造形チタン合金の疲労特性の評価
電子ビーム照射及びレーザーピーニング処理したTi-6Al-4V ELI合金の疲労特性の評価
チタン合金製髄内釘の4点曲げ疲労特性評価
純チタン・ステンレス鋼のねじり疲労特性に及ぼす切欠き因子の影響
ELID研削により表面改質を施した生体用Co -Cr 合金の腐食摩耗特性評価
予ひずみを付与したオーステナイトステンレス鋼の腐食と疲労特性の評価
βチタン合金の疲労特性に切欠きが及ぼす影響
チタン合金に成膜したアパタイト薄膜の密着強度の評価法の提案
ショットピーニングを施したチタン合金の疲労特性評価
スクラッチによる表面デザインを施したCo-Cr合金の腐食摩耗特性
骨接合用ロッキングプレートの嵌合不良に関する研究
アパタイト薄膜をコーティングしたチタン合金のせん断密着強度の評価
表面改質を施した３Ｄ造形チタン合金の平面曲げ疲労特性評価
造礁サンゴを用いた人工骨の創製とその特性評価
チタン合金のねじり疲労特性の評価
チタン合金のフレッティング疲労特性の評価
ショットピーニングを施した純チタンの疲労破壊のメカニズムの解明
アパタイトコーティングチタンの界面強度試験に及ぼす擬似体液の影響
射出成形機用SKD61材の耐腐食特性の評価
ショットピーニングを施した純チタンの疲労強度とそのメカニズム
リンク機構を有する膝用装具に加わる荷重の評価
表面デザインを施したチタン系金属材料の腐食摩耗特性の評価
表面改質を施した３Ｄ造形チタン合金のねじり疲労特性評価
３Ｄ積層造形コバルトクロム合金の疲労特性の評価
脊椎インプラントのロープロファイル化の検討
巨大ひずみ変形を施した純チタンの疲労特性に及ぼす微細構造の影響
アパタイトセラミックスを薄膜コーティングしたチタン合金の曲げ荷重負荷による界面強度の評価
随内釘インプラントの遠位固定強度の評価
医療用チタン材料へのレーザーマーキングによる強度への影響
下肢筋力測定機器の開発
異種医療用金属材料のフレティング疲労特性の評価
βチタン合金のねじり疲労特性の評価
(共同・受託研究希望テーマ)
医療機器・材料の力学特性評価
機械部品，製品などの力学特性（腐食疲労，腐食摩耗など）の評価・解析
研究キーワード
29研究分野
5経歴
4-
2011年4月 - 2012年3月
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2009年10月 - 2010年3月
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2009年9月 - 2010年3月
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2004年4月 - 2009年3月
委員歴
16-
2012年6月 - 2014年3月
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2012年4月 - 2014年3月
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2011年8月 - 2013年8月
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2011年5月 - 2013年5月
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2011年10月 - 2012年3月
受賞
25-
2024年3月
論文
113-
年次大会講演論文集 2007 301-302 2007年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.
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PROGRESSES IN FRACTURE AND STRENGTH OF MATERIALS AND STRUCTURES, 1-4 353-358 2219-2222 2007年
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INTERNATIONAL JOURNAL OF MODERN PHYSICS B 20(25-27) 3567-3572 2006年10月
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年次大会講演論文集 2006 459-460 2006年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.
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年次大会講演論文集 2006 439-440 2006年
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年次大会講演論文集 2006 447-448 2006年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.
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年次大会講演論文集 2006 449-450 2006年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.
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Orthopaedic ceramic implants 25 37-45 2006年
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年次大会講演論文集 2005 449-450 2005年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
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年次大会講演論文集 2005 451-452 2005年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.
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ADVANCED MATERIALS DEVELOPMENT & PERFORMANCE CONFERENCE 54 323-324 2005年
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年次大会講演論文集 2004 313-314 2004年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.
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年次大会講演論文集 2004 125-126 2004年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.
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7th world biomaterials congress 2004 : transactions : held May 17-21, 2004 : Sydney, Australia. : May 2004, Sydney, Australia 809 2004年
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7th world biomaterials congress 2004 : transactions : held May 17-21, 2004 : Sydney, Australia. : May 2004, Sydney, Australia 1762 2004年
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Advances in experimental mechanics : proceedings of the 12th International Conference on Experimental Mechanics 50-51 2004年
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Orthopaedic ceramic implants : proceedings of Japanese Society of Orthopaedic Ceramic Implants 23/24(24) 85-94 2004年
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BIOMATERIALS 24(8) 1447-1457 2003年4月
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年次大会講演論文集 2003 307-308 2003年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.
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9th Int. Conf. on the Mechanical Behavior of Materials Y5 2003年
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Orthopaedic ceramic implants 22(11) 9-17 2003年
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年次大会講演論文集 2002 389-390 2002年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 (⊿k). At stable crack propagation filed in the da/dN- ⊿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.
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日本脊椎脊髄病学会 13(1) 212-217 2002年1月 査読有り
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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年
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Biological and Medical Engineering 12 175 2002年
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Tissue Engineering 7(5) 635-674 2001年10月
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材料力学部門講演会講演論文集 2001 275-276 2001年
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材料力学部門講演会講演論文集 2001 529-530 2001年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.
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Materials science for the 21st century B 265-268 2001年
MISC
57-
M&M材料力学カンファレンス 2015 "GS0607-427-1"-"GS0607-427-3" 2015年11月21日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.
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M&M材料力学カンファレンス 2015 "OS1313-426-1"-"OS1313-426-3" 2015年11月21日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.
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M&M材料力学カンファレンス 2015 "OS1314-447-1"-"OS1314-447-3" 2015年11月21日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.
書籍等出版物
6-
公益社団法人日本金属学会 2014年10月 (ISBN: 9784889030761)
講演・口頭発表等
44共同研究・競争的資金等の研究課題
23-
日本学術振興会 科学研究費助成事業 2024年4月 - 2027年3月
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公益社団法人軽金属奨学会 教育研究資金 2022年4月 - 2024年3月
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日本学術振興会 科学研究費助成事業 基盤研究(C) 2019年4月 - 2022年3月
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日本学術振興会 科学研究費助成事業 基盤研究(C) 2016年4月 - 2019年3月
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日本学術振興会 科学研究費助成事業 基盤研究(C) 2013年4月 - 2016年3月
産業財産権
9社会貢献活動
5その他
23-
2025年9月 - 2025年9月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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2018年9月 - 2018年9月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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2017年8月 - 2017年8月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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2016年9月 - 2016年9月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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2015年4月 - 2016年3月理工学に関わらず，任意に特定した書籍を各自が読み，多角的で広い視野を得られるための読書会を実施している．本を通して，複数の人から実体験に基づく知識や情報，アイデアを得ることもできることに効果がある．単なる感想大会ではなく，学生主体とすることで，プラスアルファのディスカッションが深められることに読書会の意義がある．