摘要
基于橡胶材料的非线性和不可压缩特性,建立细观数值模型,采用非线性有限元方法,在细观层面,通过对短纤维增强橡胶复合材料受热载荷和热-结构载荷时的应力传递分析,研究了温度对材料热弹性和失效形式的影响,探讨了对材料热应力影响的细观结构关键因素,揭示了材料的细观破坏机理。研究表明:当受热载荷时,界面处纤维受到的压应力加强了橡胶和纤维的粘合,而纤维的端部容易脱粘;材料受热-拉伸载荷时的应力是热应力及拉伸载荷产生应力的线性组合,且随着温度增大,界面脱粘失效的几率增大,纤维断裂失效的几率减小,温度的升高使复合材料的刚度急剧下降。
Based on the rubber’s characteristic of non-linearity and non-compressibility,the mesoscopic numerical model was established.With the non-linear finite element method,the stress transfer and the effect of microparameters on the stresses and effective modulus of composites have been studied when the materials were subjected to the thermal loadings and thermal-structural loadings.One can conclude that,in the case of thermal loadings,the adhesion between rubber and fiber is reinforced because of the compressive stress at the interface,while the debonding is more likely to occur at the end of the fiber.In the case of thermal-structural loadings,the stress is a linear combination of thermal stress and structural stress.As the temperature increases,the probability of debonding failure at the interface increases while the probability of fiber breakage reduces.Besides,if the thermal stress exists,the effective modulus of composite will experience a sudden drop.
作者
高剑虹
陈佳彬
GAO Jianhong;CHEN Jiabin(Quanzhou Normal College,Quanzhou 362000,China;Liming Vocational College,Quanzhou 362000,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2018年第3期386-391,380,共7页
Journal of Materials Science and Engineering
基金
福建省教育厅中青年教师教育科研资助项目(JA14269)
泉州师范学院校自选资助项目(2014KJ12)
关键词
橡胶
短纤维
非线性有限元
热应力
有效模量
rubber
short fiber
nonlinear finite element
thermal stress
effective modulus
