Numerical analysis of effects of adhesive type and geometry on mixed-mode failure of adhesive joint

Abstract

a b s t r a c tIn the present study, the effects of the adhesive type and geometry (adhesive thickness and scarf angle) on mixed-mode failure of double scarf adhesive joint (DSJ) under uniaxial tensile loading were numerically examined using the finite element subroutine which coupled with a mixed-mode cohesive zone model (CZM). Especially, the effects of the adhesive type, which actually represent the influences of the cohesive parameters in mode I and mode II, on the mechanical properties of DSJ were discussed systematically. The numerical results reveal that the ultimate tensile loading and the necessary energy for failure of DSJ are controlled by the intrinsic components in mode I and mode II with different rates. Accordingly, the mathematical expressions for the ultimate tensile loading and the failure energy of DSJ with respect to the thickness-dependency cohesive parameters in two modes (I and II) and the scarf angle were deduced to identify each contribution in each mode component for a given type of adhesive. In addition, the numerical results also demonstrate that relationship between the interface damage level (corresponding to the ultimate tensile loading) and the adhesive thickness is not monotonous. However, as an increase of the adhesive thickness, the uniformity of damage level distribution is enhanced. Furthermore, the variation of the interface damage level with respect to the scarf angle is also not monotonous for each adhesive thickness. It can be concluded that the effects of the scarf angle and the adhesive thickness on the mixed-mode failure of DSJ are coupled rather than independently.

Non-Monotonous Effect of Adhesive Thickness on The Dynamic Stiffness of Adhesive Butt Joint

“…However, this present study use much thicker variation of adhesive layer that allows the significant modulus variation through thickness. Another possible cause of the stiffness deterioration is the increase of the interphase damage as the adhesive layer thicker[22].The results show that the overall Young's modulus of the joint is much lower compared to that of the adherend which is 69 GPa. This fact indicates that the joint stiffness is more governed by the Young's modulus of the adhesive rather than the adherend.…”

“…However, this present study use much thicker variation of adhesive layer that allows the significant modulus variation through thickness. Another possible cause of the stiffness deterioration is the increase of the interphase damage as the adhesive layer thicker [22].…”

Prediction of Adhesively Bonded Polyurethane‐to‐Steel Double Butt Joint Failure Using Uncertainty Analysis

“…More importantly, owing to the indispensable imperfection involved in the adhesive-applying process, especially for bonding dissimilar adherent (e.g., soft porous material bonded with the metal), the actual bonding area between the adhesive and the adherent is only partial of the nominal bonding area even though a spacer is used [3]. In addition, geometrical [4] and material nonlinearity [5] and some complex behaviors such as creeping [6] could be introduced when the joint is subjected to time-variable, longterm history external excitations [7].…”

Study on failure mechanism of Cu-polyethylene-Cu sandwich structure by molecular dynamics simulation

“…The failure of an interfacial system is essentially the result of multi-factor coupling. In previous studies, we analyzed the coupling effect of adhesive type and geometry (adhesive thickness and scarf angle) on the mixed-mode failure of DSJ using dimensional analysis and FE method (CZM) [25,26]. However, the intrinsic mechanism of these influential parameters is still unclear owing to the limitation of the scale.…”