船舶舷侧细节结构的热点应力计算中的不确定性因素研究

疲劳是船舶结构一种重要的失效模式。在过去的十多年间，涌现出了一些不同的疲劳强度的评估方法，其中S－N曲线法在船级社中得到了广泛的应用。但是，仅就S－N曲线法中的热点应力法而言，不同的组织和个人所预报的疲劳寿命通常也存在很大差异，而计算所得的热点应力集中系数的不同是产生这些差异的一个重要影响因素。本文运用有限元比较研究的方法，对某船舶舷侧细节结构的热点应力计算中可能存在的不确定因素进行了综合分析。通过采用不同的单元类型，不同的建模方法以及不同的有限元软件ABAQUS和ANSYS，得出了相关结论，为正确计算此类船舶结构细节的热点应力提供了指导。

An Investigation into the Uncertainty in the Calculated Hot- spot Stresses of a Shipside Structure Detail

Fatigue is an important failure mode for ship structures and different fatigue strength assessment methods were introduced over the last decade.Among them the S- N curve approach is the most widely adopted one by the Ship Classification Societies.However,as far as the hot spot stress approach is concerned,there are always very large scatter in the predicted fatigue lives,while the calculated stress concentration factor (SCF) is an important factor.In this paper,an investigation into the uncertainty in the calculated hot spot stresses of a shipside structure detail is performed through the finite element comparative study.Different element type,modeling methods,and two finite element softwares ABAQUS and ANSYS are compared ,the conclusions are presented accordingly.These conclusions may serve as a guide for the hot spot stress calculation of this kind of ship structure detail.