In this paper, the adhesive stresses in unbalanced bonded single-strap butt joints are theoretically studied.Mathematical difficulties in the analysis of high order differential equations were solved and closedform solutions for both the adhesive peel and shear stresses have been successfully developed.In the proposed solutions the adherends and doublers can be different in material and thickness.Peak stresses are located at the bonded overlap edges, especially at the inner edges.In addition, two-dimensional geometrically nonlinear finite element analyses were carried out to study the adhesive stresses in two different bonded butt joints.One was a special butt joint case with the adherends and doubler of identical material and thickness, and the other was a general butt joint case with different adherends and doubler.Good agreement in the adhesive stresses between the closed-form solutions and finite element results has been achieved.The single-strap butt joint actually consists of two single-lap joints; thus, the adhesive stress solutions can be further applied to unbalanced single-lap joints.
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Gang Li (2010) studied this question.
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