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脆性材料在动荷载作用下的裂缝弯曲和分叉行为,对深入了解材料的抗拉特性和破坏模式有着重要意义。基于损伤演化原理的有限元方法,针对脆性材料中颗粒物诱发裂缝分叉的机理展开研究,通过比较无颗粒与有颗粒两种裂缝扩展模式,分析了硬颗粒对裂缝扩展模式的影响。结果显示,当颗粒物刚度较大物性较好、裂缝扩展遭遇颗粒时裂隙将沿着交界面绕行,易发生弯曲分叉,两者具有迥异的扩展模式。
Crack bending and bifurcation behavior of brittle materials under dynamic loading are of great significance for understanding the tensile properties and failure modes of materials. Based on the finite element method of damage evolution theory, the mechanism of crack induced bifurcation of particles in brittle materials is studied. The effect of hard particles on crack propagation mode is analyzed by comparing two modes of crack propagation with no particles and particles. The results show that the fractures will be along the interface when the particles with larger stiffness are better, and the fractures will extend along the interface. Therefore, it is easy to bend and bifurcate. Both of them have different expansion modes.