| 摘要: |
| 在梯度塑性模型的基础上，假定弹性模量是塑性应变的函数，考虑应变局部化带带内和带外弹性模量的不同变化，对单轴压缩岩样作了考虑弹塑性耦合的梯度塑性分析。该模型同时反映了岩样的弹塑性耦合现象和应变局部化现象。由算例及其分析可知，应变局部化带的宽度与弹塑性耦合无关；弹塑性耦合是峰后曲线下凹部分产生的原因之一；弹塑性耦合对Ⅱ类变形行为的发生有某些抑制作用；仅考虑应变局部化带内的弹性模量与塑性应变耦合时，峰后变形曲线的下凹弯曲更为显著。 |
| 关键词: 梯度塑性 弹塑性耦合 岩样 峰后曲线 应变局部化 |
| DOI： |
| 分类号: |
| 基金项目:湖南省自然科学基金项目（04JJ40032）；湖南省教育厅科研项目（04C119） |
|
| The gradient-dependent plastic analysis of rock specimen in uniaxial compression considering elastic-plastic coupling |
|
|
| Abstract: |
| Many researchers pay great attention to strain localization theory,few of them considered the coupling behavior of the elastic and plastic deformation of rock within the localization band.Based on the gradient-dependent plasticity theory,the coupling behavior of the elastic and plastic deformation of rock is considered and a relatively elastic-plastic coupling model is proposed for a simple rock specimen in this paper.The analysis indicates that the width of shear band is independent of elastic-plastic coupling,and the example shows tht the elastic-plastic coupling is one of the reasons resulting in the curve in post-peak area,and elastic-plastic coupling restrains class Ⅱ behavior of rock some sort. |
| Key words: gradient-dependent plasticity elastic-plastic coupling rock specimen curve in post-peak area strain localization |
