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Buckling and Vibration of Composite Laminate with Multiple Delaminations

多分层复合材料层合板的屈曲和振动

基本信息

批准号：
08455460
负责人：
KONDO Kyohei
金额：
$ 3.97万
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 (B)
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

项目摘要

Buckling and vibration of composite laminates with multiple delaminations subjected to compressive loading were studied theoretically and experimentally.First, the theoretical and experimental investigations of the buckling behavior of composite laminates with single delamination were performed. The effects of the delamination length and depth on the buckling load were clarified, It was found that the load carried by the laminate increases even after the bifurcation. While the load in the thinner part of the delaminated region remains constant, the load in the thicker part increases after the buckling. The possibility of the growth of delamination due to the buckling deformations was investigated based on the potential energy release rate at the delamination tips.Next, the theoretical and experimental studies of the buckling behavior of composite laminates with multiple delaminations were conducted. The buckling load was found to be lowered by the multiple delaminations. Like for the case of single delamination, the load carried by the laminate increases even after the bifurcation. The delamination growth is prone to occur due to the higher potential energy release rate at the multiple delamination tips. The analytical solutions obtained for the buckling behavior were verified by the finite element solutions and the experimental observations.Finally, the vibration of the composite laminates with multiple delaminations was studied. By investigating the laminate without inplane loading, the effects of the delamination length and depth on the natural frequencies were clarified. And the analysis of the laminate subjected to inplane loading showed that the natural frequency decreases drastically due to the inplane compression. The results of the vibration analysis of laminates with multiple delaminations contribute to the development of the method to detect the delaminations in composite laminates.

对多重脱层复合材料层合板在压缩载荷作用下的屈曲和振动进行了理论和实验研究。首先，对单层脱层复合材料层合板的屈曲行为进行了理论和实验研究。阐明了分层长度和深度对屈曲载荷的影响，发现即使在分叉后，层压板承受的载荷也会增加。虽然分层区域较薄部分的载荷保持恒定，但较厚部分的载荷在屈曲后增加。基于分层尖端的势能释放率，研究了屈曲变形导致分层扩展的可能性。接下来，对多重分层复合材料层合板的屈曲行为进行了理论和实验研究。发现多重分层降低了屈曲载荷。与单层分层的情况一样，即使在分叉后，层压板承载的载荷也会增加。由于多个分层尖端处的势能释放率较高，因此容易发生分层生长。通过有限元解和实验观察验证了屈曲行为的解析解。最后，对多分层复合材料层合板的振动进行了研究。通过研究没有面内载荷的层压板，分层长度和深度对固有频率的影响得到了澄清。对层压板承受面内载荷的分析表明，由于面内压缩，固有频率急剧下降。具有多重分层的层压板的振动分析结果有助于开发检测复合材料层压板分层的方法。