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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 the physical model of the three-point bending test of concrete specimens, the MFPA numerical simulation system was used to simulate the expansion of the pre-crack in the three-point bending specimens of mortar and concrete until the macro-rupture of the specimens. The computer simulation gave the test. The stress-distribution pattern of the load-loading step curve and the failure process of the concrete specimen. Finally, the failure process of the specimen is analyzed. It is considered that the tensile stress at the crack tip is the driving force for crack propagation, and the non-constructive material of the concrete is pointed out. Uniformity is an important cause of the tortuous nature of a crack propagation path.