纤维增强金属基复合材料热机械循环加载力学模型  

MECHANICAL MODEL OF FIBER REINFOCED MMCs UNDER CYCLIC THERMOMECHANICAL LOADING

作　　者：牛莉莎[1] 郑岩[1] 胡齐阳[1] 施惠基[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《机械强度》2004年第z1期110-114,共5页Journal of Mechanical Strength

基　　金：国家重点基础研究规划项目 (G1 9990 650 );国家自然科学基金项目 (1 0 2 760 2 0 );(50 371 0 4 2 )资助~~

摘　　要：着重论述考虑涂层效应的纤维增强金属基复合材料的热机械加载细观力学模型。在假设基底金属为粘塑性材料 ,纤维与涂层为横观各向同性弹性材料的前提下 ,从复合材料内部组分的细观力学关系入手 ,利用平均应力应变的概念 ,分析材料在热机械载荷作用下的应力应变关系。针对金属基底的粘塑性特性 ,选择Bodner Partom模型作为金属的基本本构关系 。A micromechanical model of fiber-reinforced metal matrix composites is established with considering the coating effects. During the investigation, the coatings and fibers are assumed to have a linearly elastic behavior, but the matrix respond viscoplastically with temperature. Micro-mechanics theories using the concepts of average stress and strain are adopted and developed to integrate matrix, coating and fiber properties for predicting the stress-strain response under thermomechanical loading. Considering the viscoplastic behavior of metal matrix, the Bodner-Partom unified theory is used as the basic constitutive equations of metal matrix. The main problem is reduced to a set of the ordinary differential equations of one order that can be resolved by numerical solution algorithms.

关 键 词：纤维增强金属基复合材料 涂层效应 粘塑性 热机械加载 

分 类 号：TB333[一般工业技术—材料科学与工程] O343.6[理学—固体力学]