基于四成分固有应变T型梁焊接变形研究

Study of T BeamWelding Deformation based on Four-Component Inherent Strain

传统的固有应变法在进行焊接变形预测时只考虑结构的纵向收缩、横向收缩和角变形,没有考虑其在纵向方向上的弯曲变形,对薄板变形的计算不够准确.采用四成分固有应变的弹性有限元法,对长900 mm的薄板T型梁进行焊接变形仿真预测,给出热源校核模型和固有应变的提取方法,并进行实验对比,得到仿真数据与实测数据变形趋势一致,表明了四成分的固有应变方法能够有效地模拟薄板的焊接变形,并且固有应变的提取过程简单快捷,可以用于预测大型薄板结构的焊接变形预测.

The traditional inherent strain method considering only longitudinal shrinkage,transverse shrinkage and angular distortionis is not accurate enough for thin-plate deformation prediction because the longitudinal bending component is often neglected.Therefore,the four-component inherent strain based on elastic finite element method is used to simulate and predict the welding deformation of the 900 mm long thin-plate T beam.The heat source checking model and the extraction method of inherent strain are given,and the simulation data is consistent with the deformation trend of the measured data which shows that the four-component inherent strain method can effectively simulate the welding deformation of the thin-plate,and the extraction process of the inherent strain is simple and quick,which can be used to predict the welding deformation of large sheet structure.