Evaluation of energy release rate for delamination defects at the skin/stringer interface of a stiffened composite panel |
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| Affiliation: | 1. Department of Design and Industrial Management, University of Naples Federico II, Naples 80125, Italy;2. Department of Aerospace and Mechanical Engineering, 2nd University of Naples, Aversa (CE) 81031, Italy;1. Department of Mathematics, Sri Sivasubramaniya Nadar College of Engineering, Chennai 603 110, India;2. Department of Civil Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai 603 110, India;3. Department of Mathematics, SRMIST, Chennai 603203, India;1. Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424-Hafez Ave., 15875-4413, Tehran, Iran;2. Department of Mechanical Engineering, Damavand Branch, Islamic Azad University, Damavand, Iran;1. Durability, Damage Tolerance, and Reliability Branch, NASA Langley Research Center, W. Reid St, Mail Stop 188E, Hampton, VA 23681, United States;2. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China;1. Engineering Group, Product Department, Yoshizawa Lime Industry Co.,Ltd, Japan;2. Faculty of Engineering Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan;3. Centre of Infrastructure Engineering, University of Western Sydney, James Ruse Dr, Parramatta, NSW, 2150, Australia |
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| Abstract: | This paper deals with numerical investigation on a stiffened composite panel under longitudinal compression load, in presence of artificial delamination defects between skin/stringer interface layers.At first, both the experimental and numerical non-linear equilibrium paths were determined, until the failure load value of the structure was reached. Then local evaluation of the energy release rate parameter was performed at defect front, by means of a hybrid (FEM/analytical) procedure based on a particularized virtual crack closure technique. The same FE shell model was used to perform both global and local calculations by means of a single analysis. |
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