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Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

机译：超声冲击处理降低焊接残余应力的实验和数值模拟

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摘要

In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses have mainly turned into compressive stresses from large tensile stress after the UIT. In the thickness direction, the average decrease of longitudinal residual stress is 259.9 MPa, which is larger than the 149.1 MPa of transverse residual stress. The calculated residual stress distribution after the UIT of the thin plate is compared with that of the thick plate in the literature, with the results showing the stress accumulation layer inside the thick plate. The simulation results show that the elastic strains are decreased slightly and the equivalent plastic strain is increased markedly after UIT, which explains the mechanism of residual stress relaxation.
机译：在这项研究中，通过实验和有限元方法研究了超声冲击处理（UIT）对修复焊接接头残余应力的影响。建立了三维数值分析方法，包括热力耦合焊接模拟和动态弹塑性UIT模拟，并已通过X射线衍射测量和压痕应变方法进行了验证。结果表明，UIT后，纵向残余应力从大拉伸应力状态基本转变为小拉伸应力状态，横向残余应力主要由大拉伸应力状态转变为压缩应力。在厚度方向上，纵向残余应力的平均减少量为259.9 MPa，大于横向残余应力的149.1 MPa。将薄板的UIT之后计算的残余应力分布与厚板的残余应力分布进行了比较，结果显示了厚板内部的应力累积层。仿真结果表明，UIT后弹性应变略有下降，等效塑性应变明显增加，这说明了残余应力松弛的机理。

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