激光拼焊板HAZ力学性能的预测及有限元分析

Prediction and finite element analysis of the mechanical properties of heat affected zone of laser welded blanks

关键词:  激光拼焊板  热影响区  力学性能  加权平均法  有限元模型

Key words:  laser tailor welded blanks heat affected zone  mechanical properties  weighted average method finite element analysis

摘要:

提出采用加权平均方法描述激光拼焊板热影响区(Heat affected zone,HAZ)与母材、焊缝的性能关系,通过单向拉伸试验获得母材和焊缝的力学性能,据此建立热影响区性能参数的计算模型,并采用ABAQUS有限元软件进行仿真分析.结果表明,采用模拟与试验结果的对比确定了合理的权重系数,同时验证了所求热影响区性能的有效性.作为对比,采用混合法则方法求得热影响区性能,并与加权平均方法的模拟结果进行比较,发现采用加权平均法的模拟结果与试验结果的差别更小,更接近于试验结果.

Abstract:

The weighted average method is proposed to describethe relationship between the heat affected zone (HAZ) of laser tailor-welded blanks, the base metal and the weld.Based on the uniaxial tensile test, the mechanical properties of the base material and the weld were obtained. The prediction model is developed to determine the performance of the HAZ by ABAQUS software. By comparing the simulation results and the test, a reasonable weighting coefficient is determined, and the FEA model reliability is also proved.In addition, the performance of the HAZis also obtained by the mixing rule method, which is compared with the results by the weighted average method. There are only litter difference between the prediction results and the experiment. The prediction results by the weighted average method are closer to the test.