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Design of functionally graded joints using a polyurethane-based adhesive with varying amounts of acrylate
Affiliation:1. Department of Mechanical Engineering, University of Massachusetts Lowell, Lowell, MA 01854 USA;2. Plastics Division, Fraunhofer Institute for Structural Durability and System Reliability LBF, Darmstadt 64289, Germany;1. Department of Chemical Engineering, Canada;2. Waterloo Institute for Nanotechnology, Canada;3. Institute for Polymer Research, the University of Waterloo, Waterloo, ON, Canada N2L 3G1;1. Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal;2. INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal;1. Department of Mechanical and Materials Engineering, Masdar Institute, Abu Dhabi, UAE;2. Department of Engineering Science, University of Oxford, Parks Road, Oxford, UK;1. Instituto de Engenharia Mecânica (IDMEC), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. Departamento de Engenharia Mecânica, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;3. Università degli studi di Parma, Facoltà di ingegneria, Strada Dell''Università, 12, 43100 Parma, Italy;1. Pacific Northwest National Laboratory, P.O. Box 999, MSIN K7-90, Richland, WA 99352, USA;2. Institute Center for Energy (iEnergy), Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, PO Box 54224, Abu Dhabi, United Arab Emirates
Abstract:Adhesives with graded properties along the bondline are being developed to increase the strength of adhesively bonded joints. Efforts to do this in the past have resulted in mixed results. Two adhesive parameters need to be considered: the geometry of the gradation and the material properties of the adhesive at different gradation levels. In order to consider both of these aspects, a computational model was created to aid in not only the design of adhesive gradations but also judge whether a specific adhesive gradation method will be able to result in strength increases. In this study, the model was introduced and compared with published results. A new adhesive gradation system was created by using a polyurethane-based adhesive with varying amounts of acrylate, and a numerical analysis was performed to determine the potential advantages of the adhesive gradation.
Keywords:Finite element stress analysis  Stress distribution  Mechanical properties of adhesives  Joint design  Functionally graded bondline
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