摘要
本文提出基于应变梯度的损伤模型 ,并用于材料局部化损伤模拟预测中。在有限元数值计算中对平面问题 ,使用平面高阶连续高精度单元和有限差分方法耦合 ,在保证精度情况下可提高计算效率 ,还避免对传统有限元程序作较大的改动 ;对三维情况 ,本文构造了四面体高阶连续单元。算例表明该模型对于避免有限元数值方法局部化预测模拟的单元网格依赖性有非常好的效果 。
The strain gradient enhanced damage model based on strain gradient theory and continuum damage mechanics is established and applied to forecasting the localized damage in rock material.In FEM calculation of plane problem,the combination of nodal strain gradient determined by finite differential method with traditional FEM can avoid large modification of original FEM code and attain high efficiency and high accuracy.A tetrahedron C\-1\|continuum element is proposed to simulate the 3\|D problem.The validity of the simulation is verified by uniaxial tension and compression test data.
出处
《水利学报》
EI
CSCD
北大核心
2002年第7期70-74,共5页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目 (5 993 9190 )
关键词
岩石
应变梯度损伤
网络依赖性
高阶连续单元
strain gradient enhanced damage model
localization
mesh dependence
C\-1\|continuum element
