摘要
该文分析了含有界面相纤维增强复合材料热残余应力的空间分布.针对材料实际微结构几何特点,建立含有界面相的三维三相单丝模型,采用均匀和梯度函数描述界面相模量随空间变化规律,由轴对称体弹性力学理论得到单丝热残余应力分布,再用场叠加方法得到密排六方结构代表性体积元(RVE)中纤维间相互影响的应力场,同时应用有限元法分析RVE中纤维间的残余应力分布,两者结果基本一致.最后通过碳纤维单丝电阻法测出T300/环氧树脂体系固化后的纤维轴向残余应力,实验数据与解析和有限元分析结果基本吻合.
The thermal residual stresses distribution in a composite with interphase was analysed in the paper.A 3D single fiber model with three phases was established based on the material＇s micro structure.Homogeneous and gradient functions were used to simulate the Young＇s modulus variations in the interphase region.Single fiber model＇s residual stresses was calculated based on mechanics of symmetrical elasticity.Fields superposition method was used to get the coupled stress field in representative volume element（RVE） of close-packed hexagonal structure.This theory is verified by FEA.At last,the electrical resistance method is used to measure the axial thermal residual stress,which compares well with theory result.
出处
《固体力学学报》
CAS
CSCD
北大核心
2010年第2期142-148,共7页
Chinese Journal of Solid Mechanics
