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Rapidly cured epoxy/anhydride composites: Effect of residual stress on laminate shear strength
Affiliation:1. School of Engineering, Faculty of Science Engineering and Built Environment, Deakin University, Waurn Ponds, VIC 3217, Australia;2. Sir Lawrence Wackett Aerospace Research Centre, School of Aerospace, Mechanical, and Manufacturing Engineering, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia;3. Simuserv Pty. Ltd, Melbourne, VIC 3123, Australia;1. Key Lab of Structural Dynamic Behavior and Control, Harbin Institute of Technology, Ministry of Education, Heilongjiang, Harbin 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;3. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen, China;1. Department of Polymer Engineering, University of Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany;2. European Center for Dispersion Technologies (EZD), SKZ, KFE GGmbH, Weissenbacher Str. 86, 95100, Selb, Germany;1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy;2. University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade 35, Serbia;1. Department of Mechanical Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA;2. William E. Boeing Department of Aeronautics & Astronautics, University of Washington, Seattle, WA 98195-2400, USA;1. School of Mechanical Engineering, Chung-Ang University (CAU), 221, Huksuk-Dong, Dongjak-Gu, Seoul 156-756, Republic of Korea;2. Korea Photonics Technology Institute Lighting Solution R&BD Center, Gwangju, Republic of Korea
Abstract:The drive towards rapid cure thermosetting composites requires a better understanding of the residual stresses that develop during curing. This study investigates the impact of residual stresses on the interlaminar shear strength of resin-infused epoxy/anhydride carbon-fibre laminates. The magnitude of the residual stress was varied by changing the initial injection cure temperature between 75 °C and 145 °C. The corresponding cycle times and the final glass transition temperature of the resin were also measured. The experimentally measured chemical shrinkage and thermal expansion properties of the resin after vitrification were used as inputs to a finite element analysis to calculate the peak residual stresses in the composite. An increase in the initial cure temperature from 85 to 135 °C resulted in an increase of 25% in the residual stress, which led to an experimentally measured reduction in the composite’s short beam shear strength of approximately 16% (8 MPa), in good agreement with model prediction.
Keywords:A  Polymer matrix composites (PMCs)  B  Residual/internal stress  D  Mechanical testing  E  Resin transfer moulding
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