颗粒增强铝基复合材料损伤演化模型研究  

Damage Evolution Model for Particle Reinforced Aluminum Matrix Composite

作　　者：王将[1] 郭胜利[1] 郑弃非[1] 冯策[1] 刘成[1] 

机构地区：[1]北京有色金属研究总院国家有色金属复合材料工程技术研究中心,北京100088

出　　处：《稀有金属》2015年第9期812-817,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51205028)资助

摘　　要：颗粒增强铝基复合材料发生塑性变形时,不可避免产生损伤,最终会导致出现宏观断裂。为了研究复合材料损伤演化行为,基于连续损伤力学理论,建立了复合材料热变形过程中的损伤演化模型,把Zener-Hollomon参数当作包含变形温度和应变速率的一个变量引入模型中。利用Lematire提出的弹性模量法进行高温多道次拉伸实验,得到了复合材料不同变形条件下的损伤演化曲线。对损伤演化曲线数据拟合确定了模型参数为A(Z)=2.22769-0.09438ln Z+0.00238ln2Z,对损伤临界值拟合确定了复合材料宏观断裂的判断依据为DC(Z)=0.50915-0.00577ln Z,通过对比当前损伤值与损伤临界值可以判断是否发生宏观断裂。采用高温压缩实验对损伤演化模型进行验证,结果表明该模型可以较好地预测复合材料的宏观断裂现象,为实际生产工艺的制定提供理论依据。Particle reinforced aluminum matrix composite was inevitably damaged when plastic deformation occurred and it eventually led to the macro fracture. A damage evolution model was established to study the evolution of damage for composite during hot deformation process based on the theory of continued damage mechanics. Zeuer-Hollomon parameter which contained temperature and strain rate was taken into the model. Damage evolution curves of composite were obtained in different deformation conditions by high temperature multistep tensile test referring to the elastic modulus method proposed by Lemaitre. The parameter of the model was determined as A（Z） = 2. 22769 -0.094381nZ ＋0.002381n2Z by damage evolution curves data fitting. The judgment of macro fracture of composite was determined as Dc （Z） = O. 50915 - 0.005771nZ by the damage critical value fitting. The occurrence of macro fracture could be judged by comparing the current damage value and the damage critical value. The model was verified by high temperature compression test. The results showed that the model could better predict the macro fracture of composite and provided a theoretical basis for actual production process.

关 键 词：复合材料 损伤演化模型 ZENER-HOLLOMON参数 弹性模量法 

分 类 号：TB311[一般工业技术—材料科学与工程]