Viscoelastic Analysis of an Adhesive Tubular Joint
TL;DR: In this article, the authors used the finite element method with a prony series fitting for the relaxation modulus of two adhesives to evaluate the long term redistribution of the stresses in an adhesive tubular joint and found that not only elastic stresses are different at different levels but also the viscoelastic response shows considerable variation from one level to another.
Abstract: The investigations so far available with regard to stress analysis of adhesive joints assume that the adhesive is elastic. In the present analysis the time dependent properties of the adhesive are taken into account by assuming that the adhesive is viscoelastic. The viscoelastic analysis of a tubular joint has been attempted using a prony series fitting for the relaxation modulus of two adhesives. The long term redistribution of the stresses in the adhesive is evaluated using the finite element method. Viscoelastic analysis of an adhesive tubular joint has been performed for the first time, using the finite element method with a prony series fitting for the relaxation modulus of the adhesive. For a typical epoxy it has been found that not only the elastic stresses are different at different levels but also the viscoelastic response shows considerable variation from one level to another. As large a reduction as 57 % is noticed in the normal stress and an even larger reduction of 62% is noticed in ...
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TL;DR: In this paper, the stresses in adhesive bonded tubular lap joints, subjected to axial and torsional loads, have been analyzed using axisymmetric quadratic isoparametric finite elements.
Abstract: The stresses in adhesive bonded tubular lap joints, subjected to axial and torsional loads, have been analysed using axisymmetric quadratic isoparametric finite elements. In the axial load case, the results are compared with a previously published closed-form solution and in the torsional case the results are compared with a closed-form solution presented here. The influences on the stress distributions of an adhesive fillet and of partial tapering of the adherends are also investigated, and an extension to the range of validity pf Goland and Reissner's second criterion is proposed.
206 citations
TL;DR: A review of the literature dealing with adhesive bonding of polymer matrix composite structures can be found in this paper, where the authors present a review of adhesive bonding for thermoplastic polymer matrix composites.
Abstract: In structures composed of polymer matrix composite materials, components must be joined such that the overall structure retains its structural integrity while it is performing its, intended function which can include both mechanical loads (static and dynamic) and environmental loads (temperature and humidity). The use of composite materials in complex structures almost always reduces the number of components in the structures compared to the use of metallic alloys for the same structure. Thus, using composite materials not only results in great savings in weight, but also through a reduced number of joining operations, results in significant savings in assembly, inspection, parts storage, and movement, resulting in increased reliability and lower cost. Yet joining is still required. Joining metallic structures is a mature technology involving riveting, bolting, welding, glueing, brazing, soldering, and other methods. However, for most polymer matrix composites only adhesive bonding and mechanical fastening can be utilized. Attention has been given recently, however, to localized welding of thermoplastic polymer matrix composites, and this will be discussed briefly later. Inherently, adhesive bonding is preferable to mechanical fastening because of the continuous connection, whereas in drilling holes for bolts or rivets, fibers or other reinforcements are cut, and large stress concentrations occar at each discrete fastener hole. The following is a review of much of the literature dealing with adhesive bonding of polymer matrix composite structures. It is Intended not only to be a review, but also a background for detailed study of the referenced and other documents, and a catalyst for future research.
120 citations
TL;DR: In this paper, the effect of the adhesive thickness and the adherend roughness on the fatigue strength of the tubular single lap adhesive joint was investigated and a surface preparation method and a bonding process for the joint were devised.
Abstract: In this paper, manufacturing technology of the tubular single lap adhesive joint was studied to obtain reliable and optimal joint quality. In addition, a surface preparation method and a bonding process for the joint were devised. The effect of the adhesive thickness and the adherend roughness on the fatigue strength of the joint was experimentally investigated. From experiments, it has been found that the fatigue strength of the joint increased as the adhesive thickness decreased and the optimal arithmetic surface roughness of the adherends was about 2 μm.
80 citations
Dissertation•
01 Jan 1993
TL;DR: In this paper, an adhesive failure model of the adhesively bonded tubular single lap joint with steel-steel adherends was proposed to predict the torque capacity accurately, which incorporated the nonlinear behavior of the adhesive and the different failure modes in which the adhesive failure mode changed from bulk shear failure, via transient failure, to interfacial failure between the adherend, according to the magnitudes of the residual thermally-induced stresses from fabrication.
Abstract: Abstract The accurate calculation of the stresses and torque capacities of adhesively bonded joints is not possible without understanding the failure phenomena of the adhesive joints and the nonlinear behavior of the adhesive. In this paper, an adhesive failure model of the adhesively bonded tubular single lap joint with steel-steel adherends was proposed to predict the torque capacity accurately. The model incorporated the nonlinear behavior of the adhesive and the different failure modes in which the adhesive failure mode changed from bulk shear failure, via transient failure, to interfacial failure between the adhesive and the adherend, according to the magnitudes of the residual thermally-induced stresses from fabrication.
75 citations
TL;DR: In this article, an adhesive failure model of the adhesively bonded tubular single lap joint with steel-steel adherends was proposed to predict the torque capacity accurately, which incorporated the nonlinear behavior of the adhesive and the different failure modes in which the adhesive failure mode changed from bulk shear failure, via transient failure, to interfacial failure between the adherend, according to the magnitudes of the residual thermally-induced stresses from fabrication.
Abstract: The accurate calculation of the stresses and torque capacities of adhesively bonded joints is not possible without understanding the failure phenomena of the adhesive joints and the nonlinear behavior of the adhesive. In this paper, an adhesive failure model of the adhesively bonded tubular single lap joint with steel-steel adherends was proposed to predict the torque capacity accurately. The model incorporated the nonlinear behavior of the adhesive and the different failure modes in which the adhesive failure mode changed from bulk shear failure, via transient failure, to interfacial failure between the adhesive and the adherend, according to the magnitudes of the residual thermally-induced stresses from fabrication.
73 citations
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360 citations
TL;DR: In this article, a completely general method of numerical visco-elastic stress analysis with constant or temperature variable properties is developed. But the method is checked against some known solutions.
208 citations
TL;DR: In this article, a modified version of the well-known Wilson stress analysis program is used for the case of plane stress, where the total length beyond the lap is considered long compared to the lap length.
Abstract: This paper is concerned with the stress analysis by the finite element method of a bonded, single, lap joint. Since the adhesive layer is of primary importance, the stresses occurring in it are presented. A modified version of the well-known Wilson stress analysis program is used for the case of plane stress. The total length beyond the lap is considered long compared to the lap length. Stress concentrations as functions of dimensionless, geometric and material parameters are presented. For a given load (7, the important maximum shearing stress concentration, rmax/(7, and tearing stress concentration
144 citations
TL;DR: In this paper, a computerized analysis of composite structures formed by the adhesive bonding of materials is presented, where the adhesive is considered to be a part of a linearly elastic system whose components are individually characterized by two bulk property elastic constants.
Abstract: Computerized analysis of composite structures formed by the adhesive bonding of materials is presented. The adhesive is considered to be a part of a linearly elastic system whose components are individually characterized by two bulk property elastic constants. Solution is obtained by finite difference minimization of the internal energy distribution in a discretized, piecewise homogeneous continuum. The plane-stress, plane-strain problems are considered, and yield displacement and stress distributions for the composite system. Displacement and/or stress boundary conditions are allowed. Acute contour angles are not allowed. This is the only restriction for otherwise arbitrary plane geometries. Results are presented for typical lap shear specimens as well as for a particular case of a butt joint in which a void exists in the adhesive layer.
46 citations