A Comparative Evaluation of Numerical and Analytical Solutions to the Biadhesive Single-Lap Joint

Halil Özer,Özkan Öz

doi:10.1155/2014/852872

Halil Özer, Özkan Öz

Open Access

https://doi.org/10.1155/2014/852872

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Abstract

This paper attempts to address the detailed verification of Zhao’s analytical solution including the moment effect with the two- and three-dimensional finite element results. Zhao compared the analytical results with only the 2D FEA results and used the constant bond-length ratio for the biadhesive bondline. In this study, overlap surfaces of the adherends and the adhesives were modelled using surface-to-surface contact elements. Both analytical and numerical analyses were performed using four different biadhesive bondline configurations. The 3D FEA results reveal the existence of complex stress state at the overlap ends. However, the general results show that analytical and numerical results were in a good agreement.

Highlights

Structural adhesives have been used extensively in the space, aviation, automotive, and naval industries
Zhao [28] compared stress results predicted by the closed-form expressions only with the 2D from analytical and numerical (FEA) results
The distributions of the stress components were normalized with respect to average shear stress, and distributions of the same type of stress components were given in the same figure

Summary

Introduction

Structural adhesives have been used extensively in the space, aviation, automotive, and naval industries. Techniques reducing peel and shear stress concentrations are tapering the adherend, forming an adhesive fillet, changing the lap joint geometry, and so forth. Tapering the adherend damage fiber structure of the fiber-reinforced composites and forming an adhesive fillet are quite difficult when low viscosity adhesives are used. The stiff adhesive should be located in the middle and flexible adhesive at the ends. Different names for this type of joint are used in the literature such as mixed-adhesive, biadhesive, and hybrid-adhesive joints. High stress concentrations at the ends can be reduced by using this technique

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