Evaluation of Failure Mode and Strength on Baking Time of Adhesive for Hybrid Joining

Choi, ChulYoung; Saha, DulalChandra; Choi, Wonho; Kim, Jun-Ki; Kim, Jong-Hoon; Park, Yeong-Do

Journal of KWJS 2011;29(6):49-55.
Published online January 20, 2012.

접착제 경화시점에 따른 하이브리드 접합 파단모드 및 접합강도 평가

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Evaluation of Failure Mode and Strength on Baking Time of Adhesive for Hybrid Joining

ChulYoung Choi, DulalChandra Saha, Wonho Choi, Jun-Ki Kim, Jong-Hoon Kim, Yeong-Do Park

Abstract

  With the development of pre-painted steel sheets for automotive body application, a new joining method is required such as hybrid joining with combination of adhesive bonding and mechanical joining. The objective of this study is to investigate the effect of pre- and post-baking of adhesive bonding on failure mode and strength of hybrid joining of automotive steel sheets. Experiments show that the hybrid joining exhibits better bonding strength and displacement than conventional adhesive joining and mechanical fastening each. Comparison of pre- and post-baked hybrid joining results suggested that baking at 160℃ after mechanical joining was found to have higher joining properties than pre-baking condition. The prebaking condition changed its fracture mode from interfacial to button fracture. The changes in fracture mode with post-baking of hybrid joining was attributed to variation in neck thickness and undercut of joint.

Key Words: Hybrid joining, Adhesive bonding, Clinching joining, Baking, Tensile Strength