| Project/Area Number |
04650098
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
材料力学
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| Research Institution | Osaka Institure of Technology |
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Principal Investigator |
NAKAYASU Hidetoshi Osaka Institure of Technology, Department of Industrial Management, Professor, 工学部, 教授 (80142553)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | fiber reinforced composites materials / stochastic materials design / reliability engineering / failure probability / simulator of failure / safety index / lamination configuration / sequential failure path / 線維強化複合材料積層板 / 多層積層板 / 標準化変換 / 信頼性工学 / 繊維強化複合材料積層板 / 破損則 / 一方向積層板 / パラメータセンシティビィティ / 繊維配向角 / 信頼性設計 |
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| Research Abstract |
Studies of stochastic materials design of composite materials have been performed. For these purpose, design-oriented failure criteria of composite materials are applied to construct an evaluation model of probabilistiv safety based on the extended structural reliability theory. A new design diagra which shows the feasible region on in-plane strain space corresponding to the safety index or failure probability is also proposed. These stochastic failure envelop diagrams which are illustrated onto in-plane strain space enables one to evaluate the stochastic behavior of the composite laminate with any lamination orientation under multi-axial stress or strain condition. The sequential failure path of each layr of composite laminates in simulated by means of modulus degradation and safety Indies under the offaxis load conditions. From the simulation analysis, a typical failure path is evaluated corresponding to an in-plane strain vector. The mechanical behavior, such as decreasing modulus and increasing in-plane strain are also simulated in correspondence with each stage of sequential ply failure. It is necessary to select the important failure path whose occurrence probabilities are greater than others, since there are too many failure paths of multi-layr composite laminate evaluate. The proposed methods of selecting effective failure paths depends upon the heuristic procedure based on one branch and bound rule or selecting effective failure paths depends upon the heuristic procedure based on one branch and bound rule or genetic algorithm which enable one to estimate the effective failure path whose occurrence probabilities are greater. An extended study is performed in order to calculate the failure probability of multiple layr laminates resulting from the effective failure path, some examination for determination of lamination configuration under strength constraints was tried.
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