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本文采用有限差分析法分析了结构钢脆性裂纹扩展与止裂的试验结果。所用试样为双拉伸试样和双悬臂梁试样。据认为,动态研究对全面解释快速断裂与止裂是不可缺少的;同时,材料韧性可被定义为温度和开裂速度的函数。如果试样的边界加载条件已知,则用所定义的断裂韧性,采用裂纹扩展模拟方法就能够预测出开裂——扩展——止裂行为。这就意味着有可能研究出设计裂纹止裂装置的简易方法。
In this paper, finite difference analysis of structural steel brittle crack propagation and crack test results. The samples used are double tensile specimens and double cantilever specimens. It is believed that dynamic studies are indispensable for a comprehensive interpretation of rapid fracture and arrest; at the same time, the material’s toughness can be defined as a function of temperature and cracking rate. If the boundary loading conditions of the specimens are known, the fracture-expansion-fracture behavior can be predicted using the fracture toughness defined by the crack propagation simulation. This means that it is possible to develop a simple method of designing a crack arrestor.