Infrared thermographic evaluation of large composite grid parts subjected to axial loading |
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| Institution: | 1. Tomsk Polytechnic University, 634050, Tomsk, Lenin Av., 30, Russia;1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 00083, China;2. Geosciences Department, University of Wisconsin Parkside, Kenosha, WI 53141-2000, USA;1. Tongji School of Pharmacy, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, PR China;2. Department of Chemistry, Central China Normal University, Wuhan 430079, PR China;1. College of Light Industry, Harbin University of Commerce, Harbin 150028, PR China;2. School of Mechanical Engineering, Hei Longjiang University of Science and Technology, Harbin 150022, PR China;3. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, PR China |
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| Abstract: | Many composite parts, such as laminated panels and grid-like shells, operate under high mechanical loading. Evaluation of their structural integrity is crucial to ensure the long-lasting operation of critical components. Since testing a structure under full or “proof” load might be dangerous for personnel, it would be preferable to use a remote, rapid inspection technique. This paper describes a practical application of IR thermography to the inspection of large composite parts used in the aerospace industry. This work has used just one cycle of increasing load from zero load to failure, and this was done for both for tensile and compressive loads. It is shown that, during the formation of micro-defects in polymeric composites, about 40 % of the total dissipated energy is expended for material heating, while about 60 % is related to material damage accompanied by an increase in the defect concentration. Non-uniform composite deformation causes temperature anomalies, whose amplitude may reach 1.5–2.5 °C at a load of about 50–60 % of the limit load. |
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| Keywords: | Nondestructive testing Infrared thermography Composite grid parts Tensile and compressive loads Fracture |
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