梁-颗粒模型在混凝土侵彻问题中的应用

用二维梁-颗粒模型BPM2D（beam-particle model in two dimensions）模拟了混凝土侵彻问题。在模型中用3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分布随机赋值来模拟混凝土细观结构的非均匀性。利用此模型对在钢弹侵彻下混凝土圆板的破坏过程进行了数值模拟。通过将计算结果与实验数据及LS-DYNA程序模拟结果比较，表明梁-颗粒模型可有效地应用于计算和模拟材料从连续介质向非连续介质转变的动态破坏问题。

Application of beam-particle model to the prolem of concrete penetration

The BPM~(2D)(beam-particle model in two dimensions) was used to simulate the problem of concrete penetration. Three types of beam in the BPM~(2D) were used to create numerical models of concrete. The mechanical properties of each type of beam were randomly allocated according to Weibull distribution to reflect the initial heterogeneity of concrete at the mesoscale level. The failure process of a steel bullet perforating into a concrete panel was analyzed with this model. The comparison of the simulated results with the experimental data and the simulated results of the code LS-DYNA3D demonstrated that the BPM~(2D) was applicable to simulating the dynamic failure problems associated with the transition from continuum to discontinuous media.