Predicting environmental degradation of adhesive joints using a cohesive zone finite element model based on accelerated fracture tests |
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| Affiliation: | 1. Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India;2. Advanced Composites Laboratory, School of Mechanical and Materials Engineering, Washington State University Tri-Cities, 2710 Crimson Way, Richmond, WA 99354, USA;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;1. School of Mechanical and Materials Engineering, University College Dublin (UCD), Belfield, Dublin 4, Ireland;2. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia;3. School of Chemical and Bioprocess Engineering, University College Dublin (UCD), Belfield, Dublin 4, Ireland;1. Dept. of Mechanical Eng., Erzurum Technical University, 25050 Erzurum, Turkey;2. Independent Researcher, 25240 Erzurum, Turkey;3. Dept. of Mechanical Eng., Ataturk University, 25240 Erzurum, Turkey;4. Dept. of Mechanical Eng., Erzincan University, 24100 Erzincan, Turkey;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. Instituto de Telecomunicações, Departamento de Engenharia Eletrotécnica e de Computadores, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal |
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| Abstract: | A framework was developed to predict the fracture toughness of degraded adhesive joints by incorporating a cohesive zone finite element (FE) model with fracture data of accelerated aging tests. The developed framework addresses two major issues in the fracture toughness prediction of degraded joints by significant reduction of exposure time using open-faced technique and by the ability to incorporate the spatial variation of degradation with the aid of a 3D FE model. A cohesive zone model with triangular traction-separation law was adapted to model the adhesive layer. The degraded cohesive parameters were determined using the relationship between the fracture toughness, from open-faced DCB (ODCB) specimens, and an exposure index (EI), the time integration of the water concentration. Degraded fracture toughness predictions were done by calculating the EI values and thereby the degraded cohesive parameters across the width of the closed joints. The framework was validated by comparing the FE predictions against the fracture experiment results of degraded closed DCB (CDCB) joints. Good agreement was observed between the FE predictions and the experimental fracture toughness values, when both ODCB and CDBC were aged in the same temperature and humidity conditions. It was also shown that at a given temperature, predictions can be made with reasonable accuracy by extending the knowledge of degradation behavior from one humidity level to another. |
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| Keywords: | Cohesive zone Finite element Degradation Fracture Open-faced Adhesive joint |
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