含切口复合材料层合板拉伸应变集中与失效分析

doi:10.11868/j.issn.1001-4381.2016.000847

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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。

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	王刚
	贾普荣
	黄涛
	张龙

关键词 ：复合材料层合板, 中心切口, 应变集中, 渐进损伤模型

Abstract：

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 progressive damage model based on continuous stiffness degradation criterion was also developed to investigate 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 induced 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 notched specimens are close.

Key words： composite laminate centre notch strain concentration progressive damage model

收稿日期: 2016-07-11 出版日期: 2018-02-01

中图分类号:	O34
	TB332

基金资助:国家自然科学基金资助项目(51275422);国家自然科学基金资助项目(51475372)

通讯作者: 黄涛 E-mail: huangt@nwpu.edu.cn

作者简介: 黄涛(1976-), 男, 副教授, 博士, 主要从事复合材料及其结构的力学行为研究, 联系地址:陕西省西安市长安区西北工业大学力学与土木建筑学院(710129), E-mail: huangt@nwpu.edu.cn

引用本文:

王刚, 贾普荣, 黄涛, 张龙. 含切口复合材料层合板拉伸应变集中与失效分析[J]. 材料工程, 2018, 46(2): 134-141.
Gang WANG, Pu-rong JIA, Tao HUANG, Long ZHANG. Strain Concentration and Failure Analysis of Notched Composite Laminates Under Tensile Loading. Journal of Materials Engineering, 2018, 46(2): 134-141.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000847 或 http://jme.biam.ac.cn/CN/Y2018/V46/I2/134

Fig.1 含切口复合材料层合板拉伸试件及应变片粘贴位置
(a)圆形切口；(b)长条形切口

Fig.2 含切口复合材料层合板拉伸试件应变-应力曲线
(a)圆形切口；(b)长条形切口

Fig.3 含切口复合材料层合板拉伸试件远场应变-名义应力曲线

Fig.4 含切口复合材料层合板拉伸试件断裂形貌
(a)圆形切口；(b)长条形切口

Table 1 含切口复合材料层合板拉伸实验结果

Fig.5 含切口复合材料层合板有限元模型
(a)圆形切口；(b)长条形切口

Table 2 CYCOM X850-35-12K IM+-190复合材料属性

Fig.6 含切口复合材料层合板板试件拉伸应力-应变曲线
(a)圆形切口；(b)长条形切口

Fig.7 0°层发生初始损伤时的应变状态
(a)圆形切口；(b)长条形切口

Table 3 含切口复合材料层合板名义拉伸强度实验结果与数值模拟结果

Fig.8 含切口复合材料层合板达到极限载荷时损伤云图

Fig.9 最窄截面上的应变分布

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