齿条板与半圆板焊接变形计算及控制方法  

How to Calculate and Control Thermal Deformation of Toothed Racks and Semicircular Plates Caused by Welding

作　　者：关有良 戎青青 谭利彬 屈磊 

机构地区：[1]一重集团重型技术装备基础科学研究院,辽宁大连116113

出　　处：《一重技术》2015年第2期33-38,共6页CFHI Technology

摘　　要：齿条板是将自升式平台固定在海床上的桩腿的重要部件之一,焊接工艺要求非常高。而现有有限元模拟计算难以满足要求。因此,能为这种超大尺寸构件的焊接工艺制定提供有针对性的建议,能够快速准确地求得热变形结果的理论计算方法便具有非常的意义。这种算法基于质量守恒定律,由焊材密度变化确定体积收缩量及应变,然后根据材料弹塑性应力应变关系得到残余应力,最终根据静力学平衡方程得到齿条板整体的收缩力和总变形量。该方法已在相关项目的研发中发挥了重要作用。The toothed rack, one of the most importance parts that fix the jack-up platform on the legs, requires very strict welding processes. But the existing finite element analysis （ FEA） can not provide effective and reliable estimation. So, a theoretical calculation method that can give pertinent suggestions for the preparation of welding procedures for super-large structures and perform quick and accurate calculation to thermal deformation is very important. This calculation method is based on the conservative law of mass and uses the change in the density of welding materials to determine the volume reduction and strain, and obtains the residual stress from the elastic-plastic constitutive relationship of the welding materials, and finally determines the shrinkage force and total deformation of the toothed rack with the balanced law in static mechanics. The calculation method has played important role in the research and development of some related projects.

关 键 词：齿条板 自升式海洋平台 焊接热应力 残余应力 弹塑性本构关系 

分 类 号：TG404[金属学及工艺—焊接]