【作者】 汤安民； 刘天鹏；

【Author】 TANG AnMin LIU TianPeng(Department of Engineering Mechanics, Xi′an University of Technology, Xi′an 710048, China)

【机构】 西安理工大学工程力学系；

【摘要】 受材料特性不同与应力状态形式不同的影响,韧性材料可发生准解理断裂、孔洞正拉断、孔洞剪断和无孔洞影响的剪断等多种断裂形式,不同的断裂形式,材料中危险点位置与宏观断裂面方向则不同,相应的细观断裂机理、宏观断裂条件也有区分。J 积分理论没有区分材料不同断裂形式,将其用于金属材料一些复合型断裂试验结果时有较大误差。利用细观力学对材料断裂机理的分析,结合几种金属材料在不同应力状态下的断裂试验结果,对J准则存在的基本问题进行讨论,并对材料不同断裂形式的主要影响因素进行分析更多还原

【Abstract】 Affecting by different material characteristic and different status of stress states, ductile materials can take place many fracture status, such as nearly cleavage fracture. Holes’ traction fracture, shearing fracture affecting by holes, shearing fracture unaffecting by holes and so on. As for different fracture modes, some dangerous positions and directions of macroscopical fracture surface are different in the material, corresponding the mecroscopic fracture mechanism and the macroscopical fracture condition are different too. J integral theory which has not distinguished the different fracture modes of material result in great error while playing it on the result of mixed mode fracture experiment of metal materials. Based on the analysis of fracture mechanism of materials in mecroscopic mechanics, and experimental results of metal materials fracture under different stress states, a basic problem arising from J criterion is discussed, and main factors affecting the fracture modes of materials is analyzed.更多还原