3-Dimensional observation of the interior fracture mechanism and establishment of cumulative fatigue damage evaluation on spot welded joints using 590 MPa-class steel |
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| Affiliation: | 1. Faculty of Mechanical Engineering, Technion, 32000 Haifa, Israel;2. Institute for Frontier Materials, Deakin University, Australia;1. Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Av. Duque de Caxias Norte, 225, 13635-900 Pirassununga, SP, Brazil;2. Departamento de Engenharia de Materiais, Universidade Estadual de Ponta Grossa, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 Ponta Grossa, PR, Brazil;3. Centro de Investigación en Nanomateriales y Nanotecnología (Consejo Superior de Investigaciones Científicas, Universidad de Oviedo, Principado de Asturias), Avenida de la Vega 4-6, 33940 El Entrego, Spain;4. Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;1. Hull Rules Development Department, Nippon Kaiji Kyokai, 3-3, Kioi-cho, Chiyoda-ku, Tokyo, Japan;2. Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan;3. Research Institute, Nippon Kaiji Kyokai, 3-3, Kioi-cho, Chiyoda-ku, Tokyo, Japan;1. Department of Mechanical and Aerospace Engineering, University of Colorado Colorado Springs, Colorado Springs, CO, USA;2. School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Bend, OR, USA;1. Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109, USA;2. Department of Mechanical Engineering, The University of Michigan, Ann Arbor, MI 48109, USA |
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| Abstract: | To investigate the fatigue fracture mechanism in spot welded joints using a 590 MPa-class base metal, fatigue tests were conducted under constant loading conditions. In this study, three dimensional observation was made on the propagation behavior of fatigue cracks initiating at the edge of the slit between sheets. Moreover, an evaluation method of the fatigue life was proposed for random loading conditions. Since the mean load obviously affected the fatigue life of the spot welded joints, the proposed evaluation method was applied to account for this load effect. The proposed evaluation method satisfied the application range in the automobile industry. Therefore, it is thought that the proposed method is suitable for practical applications. |
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