不同约束条件下柱壳周向壁穿裂纹前端区域应力分布

Stress distribution in the front area of circumferential through-crack in cylindrical shell with different boundary restraints

柱壳是船舶与海洋工程结构物中主要的结构构件。由于波浪等载荷的交变作用,疲劳裂纹损伤是这类结构物中一种常见且对安全性危害极大的损伤形式,因此裂纹损伤柱壳的研究一直是一个关注的课题。本文针对柱壳周向壁穿裂纹,利用弹塑性有限元的数值解,在不同的约束条件下进行了较为详细的分析,获得了一些带有规律性的结果,为Dugdale模型等一些弹塑性断裂参数计算方法的应用提供了必要的理论基础。

Cylindrical shells are a sort of main structural members in naval architecture and offshore structures.Due to heavy cyclic wave loads,fatigue cracks which are a kind of common and dangerous damage to safety may occur in the construction.Therefore the research on the cracked cylindrical shell is a hot subject always.In this paper,a detail analysis of the circumferential through-crack in the cylindrical shells with different boundary restraints is performed by means of the elastic-plastic finite element method.The results obtained provide the application of some analysis methods of elastic-plastic fracture parameters such as Dugdale model with a necessary theoretical base.