Embedded flaws for crack path control in composite laminates |
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| Affiliation: | 1. College of Materials Science and Engineering, Wuhan Textile University, Wuhan 430073, Hubei, People’s Republic of China;2. School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Xi’an Jiaotong University, Xi’an 710049, ShaanXi, People’s Republic of China;3. Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan;1. Université de Toulouse, INSA, UPS, Mines d’Albi, ISAE, ICA (Institut Clément Ader), IUT-A GMP Toulouse, 133 c Avenue de Rangueil, 31077 Toulouse, France;2. Université de Toulouse, INSA, UPS, Mines d’Albi, ISAE, ICA (Institut Clément Ader), IUT de Tarbes. GMP. 1, rue Lautréamont, 65000 Tarbes, France;3. Université de Toulouse, INSA, UPS, Mines d’Albi, ISAE, ICA (Institut Clément Ader), 135 Avenue de Rangueil, 31077 Toulouse, France;1. The University of Alabama in Huntsville, Department of Mechanical and Aerospace Engineering, 301 Sparkman Drive, Huntsville, AL 35899, United States;2. U.S. Army Research Laboratory, Aberdeen Proving Ground, MD, United States;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee 247667, India;2. Graphic Era University, Dehradun, India |
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| Abstract: | An experimental investigation was conducted on using small flaws purposefully introduced into composite laminates to control growth of interlaminar cracks and through-thickness crack branching. Mode I crack growth specimens were used to study branching through 0°, 90° and 45° plies. The results showed that crack growth through 0° plies could be promoted by a ply gap, but this was not as controllable as combining a ply gap with a pre-crack to create a “crack branch flaw”. Crack branching through 45° plies could be controlled using crack branch flaws, and also promoted controllably using ply gaps. Crack branching through 90° plies was seen without any flaws, but was better controlled with embedded delaminations. Using these outcomes, crack branching through two quasi-isotropic laminates was demonstrated. The results have application to improved damage tolerance and fracture toughness, by taking advantage of high toughness crack growth mechanisms. |
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| Keywords: | A Laminates B Delamination B Fracture D Mechanical testing |
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