基于有限元计算细观力学的RVE库的建立与应用  

CONSTRUCTION AND APPLICATION OF RVE LIBRARY BASED ON FINITE ELEMENT COMPUTATION MICROMECHANICS

作　　者：吕毅[1] 吕国志[1] 孙龙生[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《机械强度》2009年第5期851-856,共6页Journal of Mechanical Strength

摘　　要：基于有限元计算细观力学理论,以MSC.PATRAN为平台,利用PCL(PATRAN command language)实现RVE(repr-esentative volume element)的参数化自动建模,建立RVE库,集成相应的细观力学计算程序,一体化预测复合材料宏观性能。通过工程实例,调用RVE库中的平纹编织复合材料RVE,预测平纹编织C/SiC复合材料的宏观弹性模量,对空天飞机全C/SiC复合材料机身襟翼进行静力有限元计算,实现结构材料一体化设计。A novel technique to automatically generate macroscopic properties of composites is presented. This integral technique was developed based on the method of finite element computation micromechanics （FECM）. The advanced pre- and post-processing software, MSC.PATRAN, was used as the platform for the establishment of representative volume element （RVE） hbrary. By the processes of boolean operations of RVE modeling and the matching of finite element meshes at the bi-constituents interface, the automatic parametric modeling of RVEs were implemented. Through changing the PATRAN record file, ＊ . ses fde, into a modeling function by using PATRAN command language （PCL）, the integral design had been carried out. At present, the RVE Library included four different patterns. According to the various micromechanics methods, the calculating procedure of the micromechanics were also integrated into the platform by PCL, then the macroscopic properties of composites were gained. The application of the RVE library was illustrated with a practical example. In order to do the linear static finite element analysis for the all-C/SiC body flap of space vehicle, the 2D plain weave RVE was selected from RVE hbrary, and the effective moduli was automatically generated. For the predictions of materials＇ properties and the analysis of structure have been merged into one platform, the integral design of structures and materials is realized.

关 键 词：有限元计算细观力学 RVE(representative VOLUME element)库 MSC.PATRAN 空天飞机机身襟翼 

分 类 号：V258[一般工业技术—材料科学与工程] TB332[航空宇航科学与技术—航空宇航制造工程]