摘要
对于高分子材料的仿真,业界一般使用经典的弹塑性本构模型来描述其应力-应变关系,但其真实的应力-应变关系与经典的弹塑性本构模型存在一定差异,从而导致仿真与实际测试之间的差异.Abaqus提供UMAT/VUMAT子程序接口,让用户可以自己构建新的材料本构模型.通过撰写新的材料本构子程序实现高分子材料应力-应变关系在仿真中的准确描述,减少仿真与测试之间的差异.同时,在卸载段可以通过卸载标志符的选择定义不同的卸载路径,方便用户使用.
The difference between simulation and test appears when using elastic plastic constitutive model to simulate the polymers. The UMAT/VUMAT subroutine is provided by Abaqus to help user to define material constitutive model according to the actual needs. The stress strain relationship of polymersl can be implemented precisely by defined VUMAT, and so the difference between the simulation and the test can be reduced. Meanwhile, the different unload paths can be defined by different unload flags.
出处
《计算机辅助工程》
2013年第A02期408-410,共3页
Computer Aided Engineering
