Mechanism of Compressive Strength Reduction due to Impact damage in Composite Laminate and Material Design

复合材料层合板冲击损伤导致抗压强度降低的机理及材料设计

基本信息

批准号：
06650765
负责人：
SUEMASU Hiroshi
金额：
$ 1.34万
依托单位：
Sophia University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650765/
关键词：
Composite Material Delamination CAI Buckling Post buckling Fracture mechanics Rayleigh-Ritz method Finite Element Method Composite Laminate Multiple Delamination Rectangulur Plate Fracture Toughness Rayleigh-Ritz Method

项目摘要

A research work is conducted under the title of "Mechanism of Compressive Strength Reduction due to Impact damage in Composite Laminate and Material Design". The present work is made of three parts, that is, Approximate theory, numerical simulation of fracture behavior by finite element method and experiment of the plate with multiple circular delaminations which is an ideal model of impact damage.In the Experiment, the buckling and postbuckling behaviors are studied and final failure of the specimen with multiple delaminations is caused by the delamination propagation in transverse direction to the load. It means that the inter-laminar toughness of the composite laminate is important for the CAI problem and a fracture mechanics approach should be conducted.The approximate analysis is conducted through the Rayleigh Ritz method. Through a parametric study done by this method with respect to the size, number and shape of the multiple delaminations, we obtained various interesting phenomena on the buckling strength reduction due to the impact damage. But postbuckling analysis is found to be necessary to explain the final failure behavior of the damaged plate. The finite element analysis conducted needed huge numerical efforts, because not only a three dimensional analysis is done but also a contact problem must be considered. The results explain well the buckling, post buckling and failure behaviors observed in the experiment.The buckling loads obtained through Rayleigh-Ritz agree well with those obtained through both experiment and finite element method. Considering its efficiency, the present method is useful to explain global phenomena.In order to solve the CAI (Compression After Impact) problem, the strength reduction must be studied relating the damage accumulation process during impact response.

研究工作的标题为“由于复合层压板和材料设计的影响损害，降低抗压强度的机制”。目前的工作是由三个部分组成的，即近似理论，通过有限元方法对断裂行为进行数值模拟，以及具有多个圆形分配的板的实验，这是撞击损害的理想模型。在实验，弯曲和弯曲研究行为，并通过多个分解的样品的最终失败是由横向向负载的横向传播传播引起的。这意味着复合层压板的层间韧性对于CAI问题很重要，应进行断裂力学方法。近似分析是通过Rayleigh Ritz方法进行的。通过该方法对多个分解的大小，数量和形状进行的参数研究，我们在屈曲强度降低因撞击损害时获得了各种有趣的现象。但是，发现后布分析对于解释受损板的最终故障行为是必要的。进行的有限元分析需要巨大的数值努力，因为不仅完成了三维分析，而且还必须考虑接触问题。结果很好地解释了实验中观察到的屈曲，屈曲后和失败行为。通过Rayleigh-Ritz获得的屈曲载荷与通过实验和有限元方法获得的屈曲载荷非常吻合。考虑到其效率，目前的方法对于解释全球现象很有用。在解决CAI（撞击后压缩）问题的顺序中，必须研究降低强度，以将撞击响应期间的损伤积累过程相关联。