摘要
采用二维格构模型模拟岩石类材料的开裂过程。格构模型将连续介质离散为由弹性杆或梁单元组成的二维格构网格,单元采用简单的本构关系和破坏准则,单元之间的参数可互有差异,以引入材料的非均质性。在外载作用下对整体网格进行线弹性分析,计算出格构中各单元的局部应力,超过断裂阈值的单元将破坏,材料的破坏过程通过单元的依次破坏来模拟。使用格构模型分析了单轴拉伸破坏和单边切口梁的剪切破坏。数值模拟结果表明,格构模型可作为岩石、混凝土类材料开裂分析的一种有效方法。
a lattice model is presented to simulate the cracking processes of heterogeneous brittle materials. It is assumed in the model that a continuum is represented at the meso-level by a connected lattice of elastic-brittle truss or beam elements. The heterogeneity of the materials is implemented through change of element parameters. Fracturing is simulated by performing a linear elastic analysis of the lattice under loading and removing an element from the lattice that exceeds a certain failure threshold. Once an element is removed, the analysis is repeated. With this model, uniaxial tension and the four-point-shear experiments of single-edge notched beam are simulated. It is shown that the simulated crack patterns appear quite realistic.
出处
《工程力学》
EI
CSCD
北大核心
2003年第1期117-120,126,共5页
Engineering Mechanics
基金
国家自然科学基金资助项目(59879005)
清华大学基础研究基金资助
