High-frequency-mechanical-impact (HFMI) is a post-weld treatment for improving the fatigue strength of welded structures, by introducing compressive residual stresses, localized strain hardening and enlarged weld toe radii. The Peak Stress Method (PSM) is extended for the first time to the fatigue strength assessment of HFMI treated steel joints, by means of a dedicated analysis procedure and new fatigue design curves. Experimental data generated from joints tested under uniaxial loading, both in the as-welded and HFMI treated conditions, have been taken from the literature and have been successfully analysed by using the PSM and the structural hot-spot stress (SHSS) approaches.

高频机械冲击 (HFMI) 是一种焊后处理，通过引入压缩残余应力、局部应变硬化和扩大焊趾半径来提高焊接结构的疲劳强度。通过专用分析程序和新的疲劳设计曲线，峰值应力法 (PSM) 首次扩展到 HFMI 处理钢接头的疲劳强度评估。在焊接状态和 HMI 处理条件下，在单轴载荷下测试的接头产生的实验数据取自文献，并已通过使用 PSM 和结构热点应力 (SHSS) 方法成功分析。