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Strength and failure mechanism of composite steel bonded single lap joint

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Document pages: 10 pages

Abstract: The tensile load of carbon fiber reinforced plastic (CFRP -) steel single lap joint under two layers of adhesive and four layers of lap length was experimentally analyzed and numerically simulated. It is found that the joint strength and failure mechanism are highly dependent on the adhesive type and lap length. The joint using 7779 structural adhesive has greater toughness and produces about 2-3   kn higher failure load than ma830 structural adhesive. The failure load of the two adhesives increased by about 147   N and 176   N and 1   mm of overlap length respectively. Bond failure was observed in both types of bonded joints. With the increase of lap length, the interface failure only occurs at the lap edge in 7779 bonded joint. finite element analysis ) results revealed that peel and shear stress distributions were nonuniform, which were less severe as overlap length increased. Severe stress concentration was observed on the overlap edge, and shear failure of the adhesive was the main reason for the adhesive failure.

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