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首页> 外文期刊>International Journal of Fatigue >Simulation of residual stress and fatigue strength of welded joints under the effects of ultrasonic impact treatment (UIT)
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Simulation of residual stress and fatigue strength of welded joints under the effects of ultrasonic impact treatment (UIT)

机译：超声冲击处理（UIT）作用下焊接接头残余应力和疲劳强度的模拟

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摘要

Ultrasonic impact treatment (UIT) is a remarkable post-weld technique, which applies mechanical impacts in combination with ultrasonic oscillations into welded joints introducing plastic deformation and beneficial compressive residual stress in the region of the weld toe. In this study, a novel 3D numerical analysis approach including thermo-mechanical welding simulation and dynamic elastic-plastic FE analysis of ultrasonic impact treatment process for welded joints is proposed. In the FE model, the actual process parameters and ultrasonic-induced material softening, which is appropriately adjusted to fit experimental results, are considered. The predicted residual stress distributions of a non-load-carrying cruciform joint before and after UIT are compared with experimental results, showing a fairly good agreement with each other. In addition, an evaluation of fatigue strength of welded joints based on fracture mechanics is carried out. The results not only clearly distinguish the fatigue strengths of as-weld and UIT processed weld joints, but also show the effects of preloads and stress ratios, so that the proposed solution method may provide an effective tool to simulate UIT process in engineering structures.
机译：超声冲击处理（UIT）是一项了不起的焊后技术，它结合机械冲击和超声振动将其应用于焊接接头，从而在焊趾区域引入塑性变形和有益的压缩残余应力。在这项研究中，提出了一种新颖的3D数值分析方法，包括热机械焊接模拟和超声冲击处理焊接接头的动态弹塑性有限元分析。在有限元模型中，考虑了实际的工艺参数和超声诱导的材料软化，可以对其进行适当调整以适合实验结果。 UIT前后无载荷十字形接头的预测残余应力分布与实验结果进行了比较，彼此之间显示出相当好的一致性。此外，还基于断裂力学对焊接接头的疲劳强度进行了评估。结果不仅清楚地区分了焊缝和UIT加工后的焊接接头的疲劳强度，而且还显示了预紧力和应力比的影响，从而所提出的求解方法可为工程结构中UIT过程的仿真提供有效的工具。

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