槽型舱壁极限强度

Ultimate Strength of the Corrugated Bulkhead

在过去的十几年中 ,散货船的损失一直相当严重。其中槽型舱壁在海水压力作用下的崩溃是造成散货船失事的主要原因之一。本文采用通用非线性有限元程序ABAQUS,考虑几何和材料的非线性 ,对槽型舱壁极限强度进行了数值模拟。考虑到散货船槽型舱壁结构的复杂性 ,文中首先讨论了计算模型范围 ,提出了以三个槽型加上下墩结构为计算模型 ,代表整个槽型舱壁。其次 ,计算并描述了槽型舱壁在侧向水压力作用下的弹性变形与弹性应力分布 ,以及舱壁局部与总体弹性屈曲模式。最后 ,探讨了有限元网格尺寸、槽型角度、板厚、材料屈服强度以及边界条件对槽型舱壁极限强度的影响 ;评价了槽型角度对槽型舱壁用钢量的影响。

During the past ten years,a number of oceangoing bulk carriers have been lost or damaged seriously.The collapse of corrugated bulkheads under cargo and sea pressures is one of main causes of the losses of bulk carriers.In this paper,numerical simulations of the collapse of corrugated bulkheads,which considered both geometric and material non-linearity,were performed using a general nonlinear finite element analysis code ABAQUS.First,the extension of computational model was discussed,considering the structural complexity of the corrugated bulkhead in the bulk carrier.The combination of three corrugations,the upper stool and the lower stool as the computational model was assumed to represent the whole bulkhead structure.Second,the elastic deformation,the elastic stress distribution,and the local and global elastic buckling modes were calculated and presented.Finally,the effect of the finite mesh size,the corrugation angle,the plate thickness,the material's yielding strength and the boundary condition on the ultimate strength of corrugated bulkheads was investigated.In addition,the influence of the corrugation angle on the structural weight was also evaluated.