摘要
力学约束是一种有效控制焊接变形的方法。本文基于热弹塑性有限元法,研究船体甲板板架结构在垂向力学约束条件下的焊接变形与残余应力情况,分别计算了结构在无约束和5种垂向力学约束方案下的焊接变形和残余应力,通过对计算结果的对比分析,获得最优方案。研究结果表明,垂向力学约束能使整体和局部焊接变形分别减小27%和48%,对甲板板的中面残余应力影响较小,但对板格局部弯曲应力有一定程度影响。
Mechanical constraint is an effective way to control welding deformation. Based on the thermal elasticplastic finite element method（FEM）, this paper studied the welding deformation and residual stress of a deck grillage under vertical mechanical constraint. The welding deformations and residual stresses of the structure are calculated in an unconstrained case and five vertical mechanical constraint cases. A relatively optimal case is acquired by analyzing and comparing the results of the calculation. The study shows that the global and local distortions of the grillage are decreased significantly up to 27% and 48% respectively by applying vertical mechanical constraint. The vertical mechanical constraint can barely affect the mid-surface residual stresses in the deck plate, while it can influence the local bending stresses to some extent.
作者
何昱恒
陈震
HE Yu-heng;CHEN Zhen(State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, Chin)
出处
《舰船科学技术》
北大核心
2018年第6期29-34,共6页
Ship Science and Technology
关键词
甲板分段
垂向力学约束
焊接残余应力
焊接变形
焊接数值模拟
deck grillage
vertical mechanical constraint
residual stress
welding deformation
welding simulation
