基于颗粒流的混凝土材料数值实验研究

混凝土材料是一种典型的非均质材料,其力学行为和破坏过程很复杂.本文利用PFC颗粒流软件的内嵌fish语言编写了骨料生成程序、边界条件控制程序,程序模拟了MTS伺服功能,实现了虚拟的混凝土单轴压缩试验.相对于一般有限元程序投放的骨料,文中骨料可以破裂.在生成的数值试件基础上,设计了单级配和全级配混凝土单轴压缩试验,并对其破裂形态、裂纹扩展过程、应力应变曲线和破裂过程能量变化规律进行了研究.利用该虚拟试验平台,可对混凝土的动、静力学特性进行系统研究.

Numerical Test Study of Concrete Material Based on Particle Flow

Concrete is a typical heterogeneous material, whose mechanical behaviour and rupture process are very complex. An inner embedded language of PFC particle flow software, fish, was used to compile a program aiming at the making of random concrete aggregate and the boundary condition control to simulate MTS servo function. Based on above program, virtual numerical uniaxial compression experiment of concrete was implemented. Relative to the aggregate put in concrete specimen in common used finite element method, aggregate referred in this paper can be split into pieces, which is superior to the traditional digital concrete. Moreover, based on the making of digital specimen, numerical uniaxial concrete compression test with single grading matching and all grading matching was designed, the rupture shape, fracture propagation, stress and strain curves and energy dissipation process during concrete material breakage under virtual uniaxial compression experimental condition were observed. It is found that static or dynamic features of concrete can be systematically studied by means of this virtual experimental platform.