Title: Effect of Strain Rate on Adhesively Bonded Single Lap Joints
Authors: Sree Sruthi Modala, and German Reyes Villanueva
Abstract: In this paper, the effect of strain rate on adhesively bonded single lap joints of similar and dissimilar adherends (Aluminum and Carbon fiber composites) with several adhesives was investigated. The experiments were conducted based on three different sets of substrate combinations that included 1) Al 6061 – CFRP, 2) Al 6061–Al 6061 and, 3) CFRP-CFRP using three different adhesives that included a high strength epoxy, a quick set epoxy, and a urethane-based adhesive. The manufactured single lap joints were initially tested under tensile loading conditions using a screw-driven universal tensile machine to achieve strain rates of 0.0015 s-1 and 0.15 s-1. Here, the bond strength and peak loads were determined. Furthermore, using the digital image correlation (DIC) system, the local and global strain distributions were investigated within the adhesive bond line. Initial results revealed a clear effect of strain rate on the peak load and shear lap strength. In addition, DIC analysis revealed evidence of strain concentrations at the lap ends as well as major strain distributions within the weld line. Furthermore, a combination of adhesive and cohesive failure modes was evident after low magnification analysis. Finally, these results can be utilized for analysis and design purposes of adhesive joints of similar and dissimilar materials that may be subjected to various strain rates.
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Conference: SAMPE 2019 - Charlotte, NC
Publication Date: 2019/05/20
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