摘要
用二维梁-颗粒模型BPM2D(Beam-Particle Model in Two dimensions)模拟了混凝土动态破坏过程.梁-颗粒模型BPM2D是在离散元法基础上,结合有限元法开发的二维数值计算模型. 在模型中用三种类型梁单元形成混凝土数值试样.每种类型梁单元的力学性质均按韦伯(Weibull) 分布随机赋值以模拟混凝土细观结构的非均匀性,同时梁单元的强度随应变率不同而变化.利用此模型分析了混凝土板在弹体冲击条件下的破坏过程,并给出不同弹体初始速度条件下混凝土内部应力波传播过程.通过将计算结果与实验数据相比较,表明梁-颗粒模型可有效应用于计算和模拟脆性材料动态破坏问题.
The dynamic fracture process of concrete is simulated with the BPM^2D（Beam-Particle Model in Two Dimensions）which is based on DEM in combination with FEM. In the BPM^2D three types of beam are chosen to be the concrete specimens to simulate. The mechanical properties of the elements of each and every beam vary with their strain-rate and are randomly assigned according to Weibull distribution so as to model the initial heterogeneity of concrete at microscale level. The failure process of a concrete panel under dynamic impact was analyzed by this model. The stress wave propagation in concrete at different impact velocities was displayed. A comparison of the simulated results with experimental data declares that the BPM^2D is available to simulate the dynamic failure of brittle materials.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第8期790-793,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(10072053)东北大学博士学位论文资助项目(200211).
关键词
混凝土
数值模拟
侵彻
冲击载荷
应力波
梁-颗粒模型
concrete
numerical simulation
penetration
dynamic impact
stress wave
beam-particle mode
