| Project/Area Number |
08651085
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | University of Tokyo |
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Principal Investigator |
AOKI Takahira University of Tokyo, Shool of Engineering, Associate Professor, 工学系研究科, 助教授 (00202466)
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| Co-Investigator(Kenkyū-buntansha) |
久保 智朗 東京大学, 工学系研究科, 助手 (50282679)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Composite Material / Laminate / Delamination / Compression Buckling / Thermal Load |
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| Research Abstract |
Fiber reinforced composite laminates are susceptible to delaminations as the reinforcing fibers are not placed in the interlaminar directions. In case of laminate structures designed to resist the thermal loads, the existence of delaminations can obstruct the thermal conductivity in the thickness direction, which may result in the local thermal concentration. As a consequence, unpredicted thermal deformation or associated decrease in apparent strength may take place. Present research is aimed to investigate the behavior of laminates with delaminations subjected to the thermal loads.
Post-bucking analyzes are first performed assuming the isotropy of the material, based on the theoretical derivation. The initial compression bucking deformation is used to analyze the post-bucking behavior of the laminate under combined thermal and mechanical loads. More precise analysis based on the formulation with laminate anisotropy is also conducted. Associated energy release rates are calculated to evaluate the possibility of delamination propagation. The deformations induced by the combined thermal and mechanical loads are, in general, larger than those without thermal loads. The calculated energy release rates show the complicated tendency under the presence of the thermal loads. Experiments are also conducted. However the results were not consistent due to the suspected defects in the heat source.
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