Curing effects on forming and mechanical performance of clinch-adhesive joints of dissimilar materials between AA5754 Aluminum Alloy and Q235 steel. Issue 1 (2nd January 2023)

• Record Type: Journal Article
• Authors: Zhuang, Weimin; Shi, Hongda; Li, Ming
• Is Part Of: Journal of adhesion. Volume 99:Issue 1(2023)
• Page Start: 1
• Page End: 33
• Publication Date: 2023-01-02
• Subjects: Clinch-adhesive joint -- curing degree -- curing reaction kinetic model -- forming process -- mechanical performance; Adhesion -- Periodicals; 541.33
• DOI: 10.1080/00218464.2021.1996238
• Languages: English
• ISSNs: 0021-8464

Abstract

ABSTRACT: The effects of the curing degree of the adhesive during clinching on the forming process and the mechanical performance of the clinch-adhesive joints made of AA5754 Aluminum Alloy, Q235 steel, and Araldite 2015 epoxy adhesive are investigated. First, a differential scanning calorimeter is employed in the curing experiment on the epoxy adhesive to collect the temperature heating rates in order to implement a curing reaction kinetic model that adopts the cure time as the only parameter. Second, the curing effects on the forming, mechanical performance, and failure mode of the clinch-adhesive joints are evaluated under five different curing degrees of the adhesive, including uncured, half-cured, and completely cured states. Finally, the dynamic failure processes of the hybrid joints under tensile-shear and peeling loads are investigated using a digital image correlation system. The results show that a clinch-adhesive joint, which is manufactured when the adhesive is uncured, achieves the highest level of mechanical performance, the hybrid joints that are produced using adhesives in half-cured states present low performance due to defects in the neck and "S" shape locking; specially, hybrid joints are manufactured when curing degree is 0.57, experience neck fractures and thus have the lowest mechanical performance.