Modeling and optimization of the sandwich beam specimen in three-point bending for adhesive bond characterization |
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| Affiliation: | 1. Department of Engineering Science and Methods, University of Modena and Reggio Emilia, Via Amendola 2, 42122 Reggio Emilia, Italy;2. Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4006, USA;1. Biomaterials Research Group, School of Dentistry, Universidade Anhanguera de São Paulo (UNIAN – SP), São Paulo, SP, Brazil;2. Department of Pharmacy and Biotechnology, Universidade Anhanguera de São Paulo (UNIAN – SP), São Paulo, SP, Brazil;3. DF-FC, UNESP – Universidade Estadual Paulista, POSMAT – Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, Bauru, SP, Brazil;1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China;1. Faculty of Electrical and Mechanical Engineering, University of Colima, Km. 9 carretera Colima-Coquimatlán, Coquimatlán, Col. 28400, Mexico;3. Department of Computer Engineering (DISCA), Polytechnic University of Valence, Camino de Vera s/n, Valencia, Spain;1. Faculty of Science and Department, Keio University, Japan;2. New Business Development Japan, DuPont Kabushiki Kaisha, Japan;3. Glass Laminating Solutions, E.I. DuPont de Nemours & Co. Inc, Japan;1. Department of Civil and Environmental Engineering, Imperial College London, UK;2. Department of Naval Architecture and Ocean Engineering, United States Naval Academy, Annapolis, USA |
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| Abstract: | Standard tests for adhesive bond characterization suffer for several deficiencies. The simplest specimens to make and test are lap joint geometries (e.g. single, double, symmetric, etc.) that generate complex stress distributions with irregularities and even singularities of the stress state. Those with the stress state closer to pure shear (e.g. napkin ring or Arcan) are difficult to make and require special test fixtures. This paper examines the stress state in the adhesive of a simple beam specimen obtained by bonding two flat plates one upon the other and loading the final sandwich in three-point bending. An elementary theory is used to optimize the specimen for in-situ measurements of either shear strength or shear modulus of the adhesive. The accuracy of the model is validated with finite element analyses, showing good agreement between the analytical and finite element model and also providing suggestions for the best geometry to be adopted for practical implementation of the test. |
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| Keywords: | Adhesive bonding Sandwich beam Bending Shear strength Shear modulus Optimization |
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