含局部焊接缺陷的钢桁架模型材料性能研究

Experimental Research on Material Performance of Truss Model with Typical Weld Defects

研究目的:钢桁架模型试样在焊接过程中,常会产生夹渣、气孔、焊接残余应力等缺陷,这些局部缺陷将会对有限元模型修正及实验研究产生重大影响。为了给相关计算分析提供更切合实际的材料参数以及考虑局部焊接缺陷对结构性能的影响,需要进行本文的实验研究工作。研究结论:实验研究的结果表明,含局部焊接缺陷处的材料性能参数发生了变化,应分别参照母材、焊趾区域和焊材(焊缝熔堆)取值,不能简单取某个值来相互替代,这样利用有限元软件对结构细部进行精细化计算分析的结果才能更加接近实际受力情形。

Research purposes：The slag inclusion,air hole and weld residual stress often appear in the truss model sampling during welding and these weld defects would much affect the model modification and experiment.In order to provide the material parameters for the relative calculation and consider the effect of the typical weld defects on the structure performance,this paper researches the material performance of truss model with typical welded defects.Research conclusions：The result of experimental research show the performance parameters of the material in the welded defect area are variant,the parameters should be decided separately to the master material,toe zone and weld material rather than deciding one parameter for all of them.In this way,the results of lean calculation and analysis with finite element software can be more close to the actual loading situation.