Abstract
The effect of viscoelasticity of epoxy adhesive on creep behavior in the adhesive layer of a double-lap joint is studied in this paper. The joint is comprised of three elastic single isotropic adherend layers joined by an epoxy adhesive that is under shear loading. Prony series is used to modeling the relaxation modulus of epoxy adhesive. The differential equation is derived in Laplace domain, and numerical inversion from the Laplace domain to the time domain is achieved by the Fixed Talbot method. Results show that for an impulse load of 100N, maximum shear stress in the adhesive layer is reduced to 38% of its initial value after almost 12 days and 79% of its initial value over a very long time. The rate of increase in tensile load P has a direct effect on peak shear stress developed in the adhesive layer and holding P0 as a constant, increasing t p will lower the induced peak shear stress in the joint. Also, an increase in the thickness of the adhesive layer reduced the induced peak shear stress and strain in the joint.
Highlights
The most structurally efficient method of connecting the structures is to use shear joints, which are either adhesively bonded or mechanically fastened
This paper presents an analytical study on the shear strain and stress distribution in a viscoelastic adhesive layer of a double-lap joint under tension
The differential equation is derived in Laplace domain, and numerical inversion from the Laplace domain to the time domain is achieved by the Fixed Talbot method
Summary
The most structurally efficient method of connecting the structures is to use shear joints, which are either adhesively bonded or mechanically fastened. The use of adhesives has many advantages over other methods of fastening. Presenting a smooth exterior, spreading of the load and ease of joining thin or dissimilar materials are all reasons why the use of adhesives for bonding structures is steadily growing and finding new applications (Adams, Comyn and Wake, 1997). Adhesive bonded joints are already playing a significant role in the development and production of various industries. When used to bond polymers or polymer-matrix composites, the adhesives can be selected from the same family of materials to assure good compatibility (de Geramo, Black and Kohser, 1997). Adhesives are flaw dominated and due to their viscoelastic character, time-dependent failures prob-
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