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为了在细观力学的空穴扩张比参量的基础上建立压力容器中常见的表面凹坑、机械切口、焊缝 咬边等缺陷的安全评定方法，提出了采用缺口张开位移作为宏观的工程断裂参量．研究了含轴向缺口的 模型容器，分析了单面缺口的变形特点，用大变形弹塑性有限元方法按韧带中达到材料的临界空穴扩张 比计算缺口张开位移，并与实测值作了比较。
In order to establish the safety assessment methods of surface pits, mechanical incisions and weld undercuts which are common in pressure vessels based on the parameters of void expansion of mesomechanics, a method of using notch open displacement as macroscopic engineering fracture Parameter. The model container with axial notch was studied. The deformation characteristics of single notch were analyzed. The large open elasto-plastic finite element method was used to calculate the notch open displacement according to the critical cavity expansion ratio of the material in the ligament, and compared with the measured value Compare