A CRACK CLOSURE MODEL FOR PREDICTING THE THRESHOLD STRESSES OF NOTCHES
A CRACK CLOSURE MODEL FOR PREDICTING THE THRESHOLD STRESSES OF NOTCHES
复制标题
DOI：
10.1111/j.1460-2695.1993.tb00073.x
复制
发表时间：
1993
影响因子：
3.7
通讯作者：
Jason C. Ting;F. Lawrence
中科院分区：
文献类型：
--
作者：
Jason C. Ting;F. Lawrence
提出了一种估算缺口构件门槛应力范围的模型。该模型考虑了存在缺口时裂纹闭合程度随裂纹长度的变化。门槛应力范围是由缺口产生的裂纹的有效门槛应力强度范围的最小值等于“长”裂纹的有效门槛应力强度范围的条件得到的。考虑了缺口深度、缺口锐度、缺口和试件类型、加载比和材料性能对门槛应力的影响。利用文献中报道的实验数据对模型的有效性进行了评估。结果表明，该模型正确地预测了缺口构件的裂纹行为。
A model is proposed to estimate the threshold stress range of a notched component. The model considers the variation of crack closure with crack length in the presence of a notch. The threshold stress range was found from the condition that the minimum value of effective threshold stress intensity range of a crack emanating from a notch equals the effective threshold stress intensity range of a “long” crack. The effects of notch depth, of notch acuity, of notch and specimen type, of load ratio, and of material properties on the threshold stresses were considered. Experimental data reported in the literature were used to assess the validity of the model. It was found that the model correctly predicts the behavior of cracks in notched components.