含切口复合材料层合板拉伸应变集中与失效分析  

Strain Concentration and Failure Analysis of Notched Composite Laminates Under Tensile Loading

作　　者：王刚[1] 贾普荣[1] 黄涛[1] 张龙[1] WANG Gang;JIA Pu-rong;HUANG Tao;ZHANG Long(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710129,China)

机构地区：[1]西北工业大学力学与土木建筑学院,西安710129

出　　处：《材料工程》2018年第2期134-141,共8页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51275422;51475372)

摘　　要：通过对圆形切口和长条形切口复合材料层合板试件进行拉伸实验,研究中心切口形状对层合板力学性能的影响。根据实验测得的应变分布规律确定切口引起的应变集中,并分析层合板的破坏过程。建立了基于连续刚度退化准则的渐进损伤模型,分析含切口试件的损伤扩展进程。结果表明,渐进损伤分析模型可准确描述含切口层合板的拉伸失效行为;长条形切口引起的应变集中系数较高,但切口附近的应变梯度更大;两种中心切口形式的复合材料层合板损伤进程有较大差异,但两者的拉伸强度较为接近。The influence of different shapes of centre notches on the tensile mechanical behavior of composite laminates was investigated by tension tests of composite laminates with circular notch and oblong notch.The strain concentration and failure process of notched specimens around the notch were analyzed intuitively with the strain distribution rule obtained during the tension test.A progres-sive damage model based on continuous stiffness degradation criterion was also developed to investi-gate the damage propagation processes of notched composite laminates.The results indicate that the proposed progressive damage model can accurately describe the tensile failure of notched specimens;and the strain concentration factor induced by oblong notch is more remarkable compared to that in-duced by circular notch,but the strain gradient around the oblong notch is larger;while the damage processes of the two types of notched specimens are quite different,the tensile strengths of both not-ched specimens are close.

关 键 词：复合材料层合板 中心切口 应变集中 渐进损伤模型 

分 类 号：O34[理学—固体力学] TB332[理学—力学]