巻号一覧
35 巻 (2009)
- 6 号 p. 233-
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- 3 号 p. 99-
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35 巻, 3 号
選択された号の論文の5件中1～5を表示しています
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研究論文
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横関 智弘2009 年 35 巻 3 号 p. 99-105
発行日: 2009年
公開日: 2010/12/10
ジャーナル フリーCrack tip element (CTE) method is applied to the formulation of energy release rate associated with interfacial crack growth of laminates with arbitrary layups and residual thermal stresses using the Timochenko beam model. Special attention is paid to the energy release rates of mixed mode bending (MMB) test, and mode-I and mode-II energy release rates are formulated including residual thermal stresses. The results derived are verified by the comparison to finite element analysis, and the effect of residual thermal stresses on the mode mixity of the MMB test is discussed.抄録全体を表示PDF形式でダウンロード (540K) -
海埜 孝夫, 三浦 裕樹, 杉本 直, 亀山 正樹, 胡 寧, 福永 久雄2009 年 35 巻 3 号 p. 106-111
発行日: 2009年
公開日: 2010/12/10
ジャーナル フリーThe present paper discusses an experimental identification method of impact forces acting on CFRP stiffened panels. Especially the present paper develops an impact force identification method under multiple loading. First, a transfer matrix to relate an impact force to sensor responses is determined experimentally by using an impulse hammer test. Next, the location and history of the applied force are identified using measured strain responses. The validity of the present identification method is verified through the experimental results of CFRP stiffened panels for both single and double impact loadings. The effect of impactor tip stiffness on the identification results is also examined using hard and soft tips. It is shown that the impact forces can be identified accurately even for the multiple loading using the experimental transfer matrix obtained by an impulse hammer test with a hard tip.抄録全体を表示PDF形式でダウンロード (1139K) -
吉村 彰記, 岡部 朋永2009 年 35 巻 3 号 p. 112-120
発行日: 2009年
公開日: 2010/12/10
ジャーナル フリーThe present paper proposes a simple numerical analytical method for crack extension simulation in the particle reinforced composite, and reveals the effect of crack extension on the macroscopic material properties of the particle reinforced composite. This numerical method is based on the homogenization method and Dugdale-type cohesive elements. In the present paper, we first present the formulation of the numerical model. We then verify the validity of the numerical model by comparing the simulated crack extension with the linear fracture mechanics. Finally we perform the crack extension simulation for the composite reinforced by spherical particle. We consider the inclusion crack and interfacial crack between inclusion and matrix. The analytical results reveal that the inclusion crack extends always unstably regardless of the size of initial crack, and the evolution of inclusion crack sharply decreases the apparent Young's modulus in the perpendicular direction to the crack surface and shear modulus in the out-of-plane direction of crack surface. The results also demonstrated that the interfacial crack always extends stably regardless of the size of initial crack, and the evolution of interfacial crack gradually degrades the stiffness in all direction.抄録全体を表示PDF形式でダウンロード (2362K) -
國澤 鉄也, 倪 慶清2009 年 35 巻 3 号 p. 121-128
発行日: 2009年
公開日: 2010/12/10
ジャーナル フリーA vibration, relatively high frequency, in megahertz range, is generated at the contact portion of rubber composites surface, a rotating tire for example, caused by the microscopic surface unevenness of the opposite object. Viscoelastic properties in high frequency range were measured by using both ultrasonic and conventional dynamic methods. The two methods were compared with several rubber composites. Several carbon black and carbon nanofiber were adopted for nanofillers. As a result, some differences were observed between these two methods on the behavior of storage modulus as well as loss tangent. The reason for the discrepancy between two methods was deduced from the amplitude dependence of composites containing nanofillers. It is shown that the ultrasonic viscoelasticity as a new feature can identify the anisotropy of the composites containing carbon nanofiber.抄録全体を表示PDF形式でダウンロード (1336K) -
熊澤 寿, 薄 一平, 長谷川 脩, 笠野 英秋2009 年 35 巻 3 号 p. 129-138
発行日: 2009年
公開日: 2010/12/10
ジャーナル フリーImpact tests on high-strength membrane materials under biaxial loads were experimentally conducted in order to evaluate influence of biaxial loads on impact fracture of the high-strength membrane materials for the inflated applications. Cruciform specimens of the membrane materials were fabricated for applying biaxial loadings during the impact test. A steel ball was shot using compressed nitrogen gas gun, and struck the membrane specimen. Impact tests on uniaxial strip specimens were also conducted to obtain effect of specimen configuration and boundary condition on the impact fracture. The results of the measured crack length and the ultra-high speed photographs indicate the impact fracture properties of the membrane fabrics under biaxial loadings. Crack length due to the impact increased with applied tensile load, and the impact damages of the cruciform membrane materials under biaxial loadings were smaller than those of under uniaxial loadings. Impact fracture of the strip specimen was more severe than that of the cruciform specimen due to the difference of boundary conditions.抄録全体を表示PDF形式でダウンロード (3053K)
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