单样法三点弯曲试样pop-in现象止裂的分析  

Crack arrest Analysis of Pop in Behaviour in the SENB Specimen

作　　者：杨丽敏 孙国洗[1] 

机构地区：[1]辽宁工学院应用数学教研室

出　　处：《辽宁工学院学报》1998年第1期55-58,共4页Journal of Liaoning Institute of Technology(Natural Science Edition)

摘　　要：分析了单样法三点弯曲试样Ｐ－ＣＯＤ曲线和ｐｏｐ－ｉｎ现象产生的原因，并利用能量原理对其止裂进行了理论分析。最后，根据全塑性假定，推导出了ｐｏｐ－ｉｎ发生前的裂纹长度的计算公式，并给出几个实例，这对修正韧性过渡区的材料ＪＲ曲线具有实际意义［１］。The reason and the cause of the pop in behaviour resulted from SENB specimen are analysed with single specimen technique. Also, the paper presents a theoretical analysis of the reason for crack arrest by applying the principle of energy. Finally, a formula for calculation of the crack length before the pop in is inferred with the postulation of fully plasticity. Accordingly, some examples are given for detail description, which has practical importance for correcting the JR curve for SENB specimen in the toughness transition zone of the material. (Received on Dec.19, 1996)

关 键 词：POP-IN 止裂 单样法 裂纹 三点弯曲试样 

分 类 号：O346.1[理学—固体力学]