Effect of Adhesive Type and Thickness on the Lap Shear Strength

A coupled stress and energy failure model for crack initiation in arbitrarily shaped adhesive lap joints

“…Fig. 1a) shows the failure load predictions for Steel-Hysol EA 9321-Steel single lap joints under tensile loading and experimental results of a test series regarding the effect of adhesive layer thickness on the failure load by da Silva et al [6]. It can be seen that declining failure loads with increasing adhesive layer thicknesses are predicted and the results of the present model are in a very good agreement with the experimental and numerical results.…”

Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

“…In addition, failure was demonstrated to take place progressively as energy dissipates gradually at the crack tip [4,[7][8][9][10][11]13]. Furthermore, failure generally occurs in the adhesive layer with a lower stiffness than that of the adherends, which has been proved by previous investigations [4,[8][9][10][11][14][15]. The onset of damage can be predicted without requiring any initial crack using the existing stress-or strain-based criteria [13].…”

“…In addition, the effects of the properties of adhesives on the performances of the joint are also analyzed, in which three adhesives [8] are selected: a brittle adhesive (AV138/HV998) [22], an intermediate adhesive (Hysol EA 9321) [23] and a ductile adhesive (Hysol EA 9361) [24], respectively. The tensile stressstrain curves of the bulk adhesives are shown in Fig.…”

“…Owing to the complex failure behavior of the adhesive joint, it is difficult to obtain a universal failure criterion to various situations. Alternatively, cohesive zone models (CZM) can simulate the damage onset and growth with mesh independence and dispensable initial crack, maintaining the possibility to characterize the behavior of the structure up to failure [7][8][9][10][11][12][13][14][15]. Especially, an efficient finite element computational method with the core of CZM was certified by Castagnetti et al [18], which showed that the socalled Tied Mesh method has the advantage of numerical precision and computational speed.…”

“…Failure of adhesive joints is dictated by the mechanical properties of the adhesive [7][8][9][10][11] and the stress states of the adhesive layer controlled by the geometrical configurations and constraint effects [4,12]. In addition, failure was demonstrated to take place progressively as energy dissipates gradually at the crack tip [4,[7][8][9][10][11]13].…”