具有随机分布孔洞材料塑性变形的数值模拟  

Numerical Simulation of Plastic Deformation for Materials with Randomly Distributed Pores

作　　者：贺鹏飞[1] 朱晓玲 潘琼瑶[1] 郑百林[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]榆林市自来水公司,陕西榆林719000

出　　处：《同济大学学报（自然科学版）》2008年第6期793-796,共4页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(10472084)

摘　　要：利用C语言编写了能生成含随机分布孔洞的多孔材料几何模型的程序,结合MSC商用有限元软件,分析了孔洞的体积分数、尺寸大小以及分布形态对多孔材料塑性变形性能的影响.结果表明,固定孔洞大小时,孔洞体积分数越大,材料的整体变形越大;固定体积分数时,孔洞的分布形态对材料的整体变形有较大影响,这种影响在孔洞尺寸越小时越明显;在不考虑分布形态时,孔洞体积分数和尺寸大小是影响材料变形的主要因素,它们的组合作用要看哪一个因素占主导地位.A numerical model for porous materials with random distribution of the pores is established by means of C＋＋. A commercial finite element method package, （MSC） patran/marc, is used to analyze the influence of the volume fraction, size and distribution pattern of the pores on the plastic deformation properties of the materials. Results show that the distribution pattern of the pores has a remarkable effect on the plastic deformation. For the same pore size, the materials deform more when the volume fraction of pores increases. With the fixed volume fraction, smaller the pore size is, smaller the plastic modulus is, but larger the influence of distribution on porous material properties is. If taking no account of the factor of the distribution pattern of the pores,volume fraction and size of pores are the major factors to aftect the elasto-plastic deformation of porous materials. The resultant effect depends on what factor plays the dominant role in certain cases.

关 键 词：多孔材料 有限元法 随机分布 塑性变形 

分 类 号：O39[理学—工程力学] TP302[理学—力学]