Damage Analyses of Adhesively Bonded Single Lap Joints Due to Delaminated FRP Composite Adherends
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Damage Analyses of Adhesively Bonded Single Lap Joints Due to Delaminated FRP Composite Adherends S. K. Panigrahi
Received: 2 February 2009 / Accepted: 13 May 2009 / Published online: 26 May 2009 # Springer Science + Business Media B.V. 2009
Abstract Three-dimensional non-linear Finite Element Analyses (FEA) due to an in-plane loading have been performed to evaluate the out-of-plane normal and shear stresses over the overlap region of a Single Lap Joint (SLJ) on different surfaces. These surfaces have been considered as; (i) two interfacial surfaces between the adherends and the adhesive layer, (ii) the mid-surface of the adhesive layer and (iii) two surfaces beneath the surface ply of both the adherends adjacent to the adhesive layer. The critical locations of onset of adhesion, cohesion and delamination failures on the above mentioned surfaces of the SLJ have been determined using suitable damage criteria. A comparative study due to adhesion, cohesion and delamination failures in the SLJ with Fiber Reinforced Polymeric (FRP) composite adherends have been presented. The effects of simultaneous variations of the delamination positions on the out-of-plane peel and shear stress components have been studied by preembedding the delamination damages at the critical locations in both the adherends. It has been observed that the possibilities of onset of cohesion failures in the adhesive layer are higher compared to the adhesion and delamination failures. The detailed analyses showed that secondary peaks of out-of-plane stress components (σz, τyz and τxz) on the mid surface of the adhesive layer appeared at the locations closer to the delamination fronts due to preembedded delamination damages. The highest stress magnitudes on the overlap edge of the SLJ have been reduced significantly when the centers of the delamination damages are exactly aligned with the overlap ends of the joint. No significant variations of stress magnitudes have been noticed either when the delaminations are pre-embedded outside the overlap regions or when the delamination damages are completely entrapped within the overlap region. Keywords Adhesion failure . Cohesion failure . Delamination damage . FEA . FRP . SLJ
S. K. Panigrahi (*) Mechanical Engineering Department, North Eastern Regional Institute of Science and Technology (Deemed University), Nirjuli, Arunachal Pradesh 791 109, India e-mail: [email protected] e-mail: [email protected]
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Appl Compos Mater (2009) 16:211–223
1 Introduction Adhesively bonded technology has been extensively used to join similar and dissimilar materials to form load-bearing structural joints or integrated structures [1, 2] in aerospace, automobile and marine industries over the last three decades. This technology offers many advantages such as it enables dissimilar materials to be joined, even when one of the components is non-metallic, and also it allows for a uniform diffusion of the load into the structure, thus reducing the localized stresses encountered compared to other joining methods, particular
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