摘要
采用界面弹性-软化内聚力模型,用解析法研究了单纤维/聚合物基体复合材料高温固化后的残余应力分布。结果表明:较高固化温度引起界面软化和脱粘;纤维中残余应力分布由应力增长区和应力平台区组成,残余应力平台值与固化温度及纤维和基体热膨胀系数差值成正比,界面参数只对残余应力增长区的分布有影响;在界面断裂韧性相同情况下,界面弹性模量增加缩短应力传递长度,界面软化模量增加减少软化长度,弹性和软化模量变化不影响界面脱粘的温度。
The residual stress in the single fiber/polymer matrix composite after high temperature curing was investigated using analytical method.The elastic-softening cohesive zone model for the interface was used.The results indicate that the higher curing temperature causes softening and debonding along the interface.The residual stress in the fiber consists of building-up and plateau regions.The residual stress in the plateau region is proportional to the curing temperature and the thermal expansion coefficient difference between fiber and matrix.The interfacial parameter has only influence on the residual stress in the building-up region.Under the same value of interface fracture toughness,the increase of interfacial elastic modulus shortens the stress transfer length,the increase of softening modulus decreases the softening length,and the temperature which leads to the initial interface debonding is not affected by the change of interfacial elastic and softening modulus.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第12期216-221,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(11032005)
关键词
复合材料
残余应力
解析法
界面
内聚力模型
composite
residual stress
analytical method
interface
cohesive zone model
