冲击载荷下混凝土破坏过程数值模拟  

Numerical Simulation of Fracture Process of Concrete Under Dynamic Impact

作　　者：张德海[1] 朱浮声[1] 邢纪波[2] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]烟台大学土木系,山东烟台264005

出　　处：《东北大学学报（自然科学版）》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).

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.

关 键 词：混凝土 数值模拟 侵彻 冲击载荷 应力波 梁-颗粒模型 

分 类 号：O313.4[理学—一般力学与力学基础]