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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
【Author】 NIU LiSha ZHENG Yan HU QiYang SHI HuiJi(Department of Engineering Mechanics, Tsinghua University, Beijing 100084,China)
【机构】 清华大学工程力学系；
【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,并进一步将主要问题归纳为可以数值求解的以时间为自变量的一阶常微分方程组的初值问题
【Abstract】 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.
【Key words】 Fiber-reinforced metal matrix composites； Coating effects； Viscoplasticity； Thermomechanical loading；
- 【会议录名称】 第十二届全国疲劳与断裂学术会议论文集
- 【会议名称】第十二届全国疲劳与断裂学术会议
- 【会议时间】2004-11
- 【会议地点】中国厦门
- 【分类号】TB333
- 【主办单位】中国腐蚀与防护学会、中国机械工程学会、中国力学学会、中国金属学会、中国航空学会、中国材料研究学会