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Understanding the factors controlling the interfacial failure strength of advanced high-strength steel resistance spot welds: hardness vs. fracture toughness

Pouranvari, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2017.1421303
  3. Publisher: Taylor and Francis Ltd , 2018
  4. Abstract:
  5. The failure of advanced high-strength steels’ spot welds is a critical issue for automotive crashworthiness. This paper deals with understanding the underlying factors of the tensile-shear strength of automotive steels’ resistance spot welds during interfacial failure. It was found that the ratio of the fracture toughness to the hardness of the fusion zone is the critical factor governing the interfacial failure mechanism: ductile shear failure (controlled by the fusion zone hardness) vs. cleavage crack propagation (controlled by the fracture toughness). This clarification could pave the way for more accurate modelling of interfacial failure of advanced steel resistance spot welds and shed light on the design of proper post-weld heat treatment for improving the weld mechanical performance. © 2018 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute
  6. Keywords:
  7. Advanced high-strength steel ; Failure ; Toughness ; Clarification ; Computer system recovery ; Crashworthiness ; Ductile fracture ; Hardness ; Heat resistance ; High strength steel ; Spot welding ; Welds ; Advanced high strength steel ; Ductile shear failure ; Interfacial failures ; Mechanical performance ; Post weld heat treatment ; Resistance spot weld ; Resistance spot welding ; Tensile shear strength ; Fracture toughness
  8. Source: Science and Technology of Welding and Joining ; Volume 23, Issue 6 , 2018 , Pages 520-526 ; 13621718 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/13621718.2017.1421303