双相钢激光焊接头局部区域力学性能预测及有限元模拟

Prediction and Finite Element Simulation of Local Mechanical Properties of Laser Welded Joint of Dual-phase steel

  • 摘要: 为获得DP980双相钢激光拼焊接头力学性能,制备含有不同焊接接头分区试样结合混合法则获得接头各区域力学性能,并进行有限元模拟验证,分析纵向接头变形与失效。结果表明:不同分区试样接头的载荷-位移模拟曲线与实验曲线相吻合;纵向接头载荷-位移模拟与实验曲线相接近,模拟断裂位置与实际断裂位置相一致;纵向接头断裂失效模式由焊缝区中心向两边延伸至母材区;接头宏观断口形貌焊缝区、软化区以及母材区均分布等轴韧窝,接头整体呈现为塑性断裂模式。

     

    Abstract: In order to obtain the mechanical properties of DP980 dual-phase laser welded joint, samples containing different sections of welded joints were prepared and combined with the mixing rule to obtain the mechanical properties of each area of the joint, and finite element simulation verification was carried out to analyze the deformation and failure of the longitudinal joint. The results show that the load-displacement simulation curves of the sample joints in different zones are consistent with the experimental curves. The load-displacement simulation of the longitudinal joint is close to the experimental curve, and the simulated fracture location is consistent with the actual fracture location. The failure mode of the longitudinal joint extends from the center of the weld zone to both sides to the base metal zone. The macroscopic fracture morphology of the joint shows equiaxed dimples distributed in the weld zone, the softened zone and the base metal zone. The joint as a whole presents a ductile fracture mode.

     

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