脆性颗粒材料的超弹性软化模型及应变局部化模拟

Models of Hyperelasticity with Softening and Simulation of Strain Localization for Brittle Granular Materials

在Volokh软化模型的基础上,考虑颗粒材料的变形和破坏机制,认为颗粒材料以剪切变形和破坏为主,提出了表示软化程度的软化因子概念,发展了两种能够部分表征颗粒材料力学行为特征的软化模式,并基于ABAQUS用户材料子程序(UMAT)开发相应程序.数值算例考察了上述模型模拟颗粒材料应变局部化现象和软化现象的能力.结果表明了所建议模型的有效性和可行性.

Two modified softening models are developed based on the Volokh softening model to consider the deformation and failure of granular material which is governed by shear deformation and failure. Different treatments to the volume strain energy and the shear strain energy are used in the two modified models, and a concept of the softening factor to indicate the degree of softening is proposed. Based on user-defined material （UMAT） of ABAQUS, the simulation is implemented. Numerical examples illustrated the capability and performance of the presented models in modeling strain localization and strain softening of granular materials.