TiC-Ni系功能梯度材料的断裂力学有限元分析

根据实验结果给出了功能梯度材料热物性参数的估计模型,用有限元素法研究了含有垂直于梯度方向裂纹的功能梯度材料,分别考虑了机械载荷、均匀热载荷以及非均匀热载荷作用下,梯度分布指数对裂纹尖端应力强度因子、应变能密度以及裂纹扩展角的影响。 

CRACKING PROBLEM ANALYSIS OF TiC-Ni FGM USING FINITE ELEMENT METHOD

In this paper,a geometric model and a model of physical properties of the system of TiC-Ni functionally graded materials are given obtained from experiment. And with the two models,the influences of gradient exponent on stress intensity factors,strain energy density factors and its initiating angles are analyzed using the finite element method. The stress intensity factor and stress energy density factor of model Ⅰ under distributed load have the minimum values when P is 1.3, but the stress intensity factors and stress energy density factors of model Ⅱ under residual stress field or stable thermal field only have maximum ones. On the other hand, the influences of gradient exponent on fracture initiating angles under residual stress field or stable thermal field are much larger than under the distributed load.