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Behavior of Composite Laminates with Defects under Thermal Load

热载荷下有缺陷的复合材料层压板的行为

基本信息

批准号：
08651085
负责人：
AOKI Takahira
金额：
$ 1.02万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08651085/
关键词：
Composite Material Laminate Delamination Compression Buckling Thermal Load

项目摘要

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.

由于增强纤维未沿层间方向放置，因此纤维增强复合材料层压板容易分层。在设计用于抵抗热载荷的层压结构的情况下，分层的存在会阻碍厚度方向的导热性，这可能导致局部热集中。因此，可能会发生不可预测的热变形或相关的表观强度下降。目前的研究旨在研究分层层压板在热载荷作用下的行为。首先根据理论推导假设材料各向同性，进行后屈曲分析。初始压缩屈曲变形用于分析层压板在热载荷和机械载荷组合下的后屈曲行为。还进行了基于层压各向异性配方的更精确的分析。计算相关的能量释放率以评估分层传播的可能性。一般来说，由热载荷和机械载荷联合引起的变形比没有热载荷的变形大。计算的能量释放率显示出热负荷存在下的复杂趋势。还进行了实验。然而，由于怀疑热源存在缺陷，结果并不一致。