Fatigue assessment of welded and high frequency mechanical impact (HFMI) treated joints by master notch stress approach
作者： Martin Leitner , Michael Stoschka , Markus Ottersböck
DOI: 10.1016/J.IJFATIGUE.2017.01.032
关键词: Joint (geology) 、 Structural engineering 、 Structural stress 、 Welding 、 Stress ratio 、 Mechanical impact 、 Fatigue limit 、 Engineering 、 Stress concentration 、 Stress (mechanics)
摘要: Abstract High frequency mechanical impact (HFMI) treatment is a reliable and utmost effective method for post-weld fatigue strength improvement of steel joints, especially in case high-strength applications. In 2014, the HFMI master notch stress approach was firstly introduced as an alternative design concept. It features engineering-feasible to assess HFMI-treated joints based on weld toe concentration, base material yield load ratio. This paper presents essential update by facilitating factor K W , obtained ratio σ k structural s . enables thorough assessment welded structures without need nominal cross-section definition. To proof applicability, comprehensive validation incorporating over 230 additional joint specimen results covering both constant variable amplitude tests conducted. The study reveals that approach, utilizing well applicable strengths up ultra steels with limit 1300 MPa. addition, service evaluation loaded considering specified damage sum D = 0.3 according Sonsino can be also utilized joints.
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