摘要
根据混凝土试件三点弯曲试验的物理模型，用ＭＦＰＡ 数值模拟系统对砂浆和混凝土三点弯曲试件中预裂纹的扩展直至试件宏观破裂的整个过程进行了模拟分析·计算机模拟给出了试件的载荷加载步曲线和混凝土试件的破坏过程的应力分布图·最后，对试件的破坏过程进行了分析，认为裂纹尖端的拉应力是裂纹扩展的动力，指出了混凝土组成材料的非均匀性是造成裂纹扩展路径曲折性的重要原因·
According to physical model of three point bending test, the complete processes from the initiation and propagation of microcracks to the macroscopic failure of concrete specimen and mortar specimen were simulated by using MFPA 2D (material failure process analysis) code. The load step curve and the stress distribution figures during the deformation and failure process of the concrete specimen were presented. Based on the analysis of simulated results, it is concluded that the tensile stress at the crack tip is the driving force for the crack propagation, and the heterogeneity of concrete has a great influence on the crack propagation path which leads the crack propagation path becoming curvilinear.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第5期533-534,共2页
Journal of Northeastern University(Natural Science)
基金
国家杰出青年科学基金
中国科学院力学研究所非线性连续介质力学开放实验室基金
关键词
数值模拟
计算机模拟
混凝土
三点弯曲试验
three point bending, heterogeneity, failure process, numerical simulation.
