Elastic-plastic behavior of adhesive layer and validity of ISSF evaluation method in butt joints

Abstract

The adhesive strength is usually expressed as an average stress σ_c = P/A but it is known that σ_c decrease with increasing the volume of the adhesives. Here, P is an ultimate tensile load and A is an adhesive area. In this study, three models are considered based on ISSF = const. The first model changes the adhesive thickness h under fixed the adhesive area A = W² based on JIS. The second model changes A = W² under fixed h. The third model changes the adhesive volume under fixed the adhesive layer’s geometry h/W. It is found that σ_c can be used to express the adhesive strength since σ_c is independent of the volume of adhesives under the same adhesive thickness h.