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第三节裂源位置及裂纹扩展方向的判别在断裂失效分析中一个重要内容就是要确定裂源的位置与裂纹的扩展方向。如果在断裂事故中只产生一条裂纹,一般根据裂纹开口的大小很容易判断裂源的位置,即裂纹开口最大处为裂纹的起点;而开口最大处指向裂纹尖端处的方向为裂纹的扩展方向。这些常识性的知识一般工程技术人员均是熟知的。如果在
Section III Discrimination of Crack Source Location and Crack Propagation Direction An important part of fault failure analysis is to determine the location of crack sources and the direction of crack propagation. If there is only one crack in a fracture accident, the location of the crack source can be easily judged according to the size of the crack opening. That is, the maximum crack opening is the starting point of the crack. The maximum crack opening direction is the maximum crack opening direction. These common-sense knowledge are generally well-known to engineering and technical personnel. If at