Fatigue strength improvement factors for high strength steel welded joints treated by high frequency mechanical impact |
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| Affiliation: | 1. Department of Engineering Science, University West, SE-461 86 Trollhättan, Sweden;2. Material Technology, Volvo Group Trucks Technology, SE-405 08 Gothenburg, Sweden;1. Cetim, Senlis, France;2. Liebherr-France SAS, Colmar, France;3. INSA- Mateis, Lyon, France;1. Steel Research Laboratory, JFE Steel Corporation, 1, Kawasaki-cho, Chuo-ku, Chiba, Japan;2. Fracture and Reliability Research Institute, Tohoku University, 6-6-11-701, Aoba, Aramaki, Aoba-ku, Sendai, Japan |
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| Abstract: | Numerous studies have observed that the fatigue strength of improved welds increases with material yield strength. This paper provides a comprehensive evaluation of published data for high frequency mechanical impact treated welds. In total, 228 experimental results for three weld geometries subject to R = 0.1 axial loading have been reviewed. A design recommendation including one fatigue class increase in strength (about 12.5%) for every 200 MPa increase in static yield strength is proposed and are shown to be conservative with respect to all available data. Special cautions are given for high R-ratio or variable amplitude fatigue and potential alternate failure locations. |
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