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为了寻求更为简单、准确的临界裂纹尖端张开角(CTOAc)测量方法以推广CTOA准则的应用,本文对材料CTOAc的测量方法进行了研究。根据CTOA的性质及Gteborgs Kungliga Segel Sllskap(GKSS)提出的CTOAc估算方法导出了两种不同裂纹尖端张开位移(CTOD)定义之间的关系,并进一步得到一种基于准静态拉伸试验的CTOAc测量方法,该方法与GKSS提出的估算方法相等效但更加简单。为了验证准静态拉伸试验法的准确性,对7B04 M(T)试样进行了静态拉伸试验,并使用上述两种方法估算7B04的CTOAc,结果表明两种方法估算出的CTOAc仅相差1%。同时分别采用平面应变核模型、平面应力模型对试样进行了弹塑性有限元模拟,模拟结果与试验结果相吻合。
In order to find a simple and accurate method for measuring critical crack tip opening angle (CTOAc) to promote the application of CTOA criterion, the measurement method of material CTOAc was studied in this paper. According to the properties of CTOA and the estimation of CTOAc proposed by Gteborgs Kungliga Segel Sllskap (GKSS), the relationship between the definitions of two different crack tip open displacements (CTOD) was derived and a new method based on quasi-static tensile Experimental CTOAc measurement method, which is equivalent to but simpler than the estimation method proposed by GKSS. In order to verify the accuracy of the quasi-static tensile test method, the static tensile test was performed on the 7B04 M (T) sample and the CT04 of 7B04 was estimated using the above two methods. The results show that the calculated values of the two methods differ only by 1 %. At the same time, the plane strain nuclear model and the plane stress model were used respectively to simulate the elastic and plastic finite element of the specimen. The simulation results are consistent with the experimental results.