Nonlinear frequency mixing of Lamb wave for detecting randomly distributed microcracks in thin plates |
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| Institution: | 1. Center for Safety Measurements, Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea;2. Safety Qualification Technology Center, KHNP Central Research Institute, 1312 Yuseong-daero, Yuseong-gu, Daejeon, Republic of Korea;1. The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China;2. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;3. Key Disciplines Laboratory of Novel Micro-nano Devices and System Technology, International R & D center of Micro-nano Systems and New Materials Technology, Chongqing University, Chongqing 400044, China;1. School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia;2. Defence Science and Technology Group, Melbourne, VIC 3207, Australia;3. School of Mechanical & Mining Engineering, University of Queensland, Brisbane, QLD 4072, Australia;1. University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USA;1. School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;2. School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;3. Department of Civil and Environmental Engineering, KAIST, Daejeon 305-701, South Korea;1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong Special Administrative Region;2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China;3. Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong Special Administrative Region |
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| Abstract: | In engineering practice, the microcracks usually generate during the initial period of fatigue, and randomly distribute in the metallic structure. It is great challenge for linear non-destructive testing methods to detect those microscopic damages. In this work, the numerical simulations on nonlinear interaction between Lamb wave and microcracks are performed to investigate the behavior of frequency mixing in aluminum plates. From the simulation results, the nonlinear parameter based upon sum frequency shows a monotonically increase with the length of microcracks, and a monotonically decrease with the width of microcracks. The distribution area and density of the cracks also affect the nonlinear interactions between Lamb wave and microcracks. This work theoretically demonstrates that the nonlinear frequency mixing method is a robust strategy to detect microcracks at the initial fatigue stage in metal plates. |
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| Keywords: | Ultrasonic nonlinearity Lamb wave mixing Microcracks Finite-element simulation |
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