东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (5): 731-735.DOI: 10.12068/j.issn.1005-3026.2016.05.026

• 资源与土木工程 • 上一篇    下一篇

脆性颗粒材料的超弹性软化模型及应变局部化模拟

楚锡华， 修晨曦， 常江芳   

  1. (武汉大学 土木建筑工程学院， 湖北 武汉430072)
  • 收稿日期:2014-09-22 修回日期:2014-09-22 出版日期:2016-05-15 发布日期:2016-05-13
  • 通讯作者: 楚锡华
  • 作者简介:楚锡华(1977-)，男，河南濮阳人，武汉大学副教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(10802060，11172216，11472196)；国家重点基础研究发展计划项目(2010CB731502)； 湖北省自然科学基金资助项目(2013CFB287).

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

CHU Xi-hua， XIU Chen-xi， CHANG Jiang-fang   

  1. School of Civil Engineering， Wuhan University， Wuhan 430072， China.
  • Received:2014-09-22 Revised:2014-09-22 Online:2016-05-15 Published:2016-05-13
  • Contact: CHU Xi-hua
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摘要： 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.

关键词: 颗粒材料, 超弹性软化, 应变软化, 软化因子, 应变局部化

Abstract: 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.

Key words: granular materials, hyperelasticity with softening, strain softening, softening factor, strain localization

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