PERFORMANCE STUDY OF HYBRID BOLTED-BONDED VERTICAL T- AND L-JOINTS WITH COMPOSITE ADHERENDS SUBJECTED TO UNDERWATER SHOC
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PERFORMANCE STUDY OF HYBRID BOLTED-BONDED VERTICAL T- AND L-JOINTS WITH COMPOSITE ADHERENDS SUBJECTED TO UNDERWATER SHOCK PRESSURE E. Selahi
UDC 539.3; 621.8
Abstract: Three-dimensional explicit dynamic simulations are carried out to study the failure of hybrid bolted-bonded vertical T- and L-joints under noncontact underwater explosion shock pressure. In this modelling, adherends are fibrous laminated composites having an orthotropic behavior, while bolts and adhesive layers exhibit an isotropic behavior. It is found that hybrid vertical T- and L-joints display appreciably higher joint resistance to underwater explosion shock pressure than adhesive Tand L-joints. Keywords: bolted-bonded joint, underwater shock pressure, composites, performance and failure analysis, T-joint, L-joint. DOI: 10.1134/S0021894420040173 INTRODUCTION Joints are weak points in composite structures. Adhesive joints are the most common bonding method in composite structures. Adhesive joints have a high resistance to shear, but a relatively low resistance to peeling. Therefore, an idea was created to improve the peeling strength by adding bolts at the adhesive layer. Bogdanovich and Kizhakkethara [1] applied a three-dimensional (3D) finite element method (FEM) to model double lap composite joints. Selahi et al. [2] presented mathematical modeling for the analysis of composite bonded lap joints with a thick adhesive layer. They also modified this mathematical modeling to study bonded composite joints with a nonlinear adhesive behavior [3]. Wu et al. [4] performed finite element (FE) simulations and experimental tests to examine the failure of T700/ bismaleimide adhesive composite T-joints under tensile loading. Domingues et al. [5] obtained stress distributions, damage, strength, and failure modes of bonded vertical L-connections of aluminum and composite parts numerically and experimentally. Few researches have been performed in the field of hybrid composite bolted-bonded joints. Chan and Vedhagiri [6] used FEM to study the stresses in laminated composite bolted, bonded, and hybrid joints. Barut and Madenci [7] developed a semi-analytical method for the stress analysis of single lap hybrid composite joints under in-plane and lateral loads. Hoang-Ngoc and Paroissien [8] applied FEM to simulate lap bonded and bolted-bonded joints with a flexible adhesive behavior. Recently Selahi [9] employed the ANSYS Workbench software and 3D FE simulation to the study failure of hybrid bonded-bolted single and double lap joints with laminated composite adherends under axial, shear, and bending loads. The response of marine structures under shock loads due to a noncontact underwater explosion (UNDEX) has attracted the attention of many researchers and designers of naval vessels. Mouritz [10] compared the UNDEX
Department of Mechanical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran; [email protected]. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 61, No. 4, pp. 151–161, July–August, 2020. Original article submitted Nov
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