摘要:利用大型有限元软件ABAQUS提供的接口程序UEL,开发了压力相关弹塑性Cosserat连续体材料的用户单元.采用平面八节点等参单元,包括平动与转动三个自由度,考虑相关联流动的Drycjer-Prager材料模型,应力计算采用四阶龙格-库塔法.利用该单元分析了材料局部化问题中网格密度与材料特征长度的影响.结果表明,网格密度对材料剪切带厚度与等效塑性应影响很小;随着特征长度增大,剪切带厚度增大,等效塑性应变峰值减小.
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