Modeling and experimental study on electrical impedance response to damage accumulation in 2D C/SiC composites |
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| Affiliation: | 1. National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, PR China;2. Postdoctoral Research Center for Material Science and Technology, Harbin Institute of Technology, Harbin 150001, PR China;3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, PR China;1. Institute for Materials Applications in Mechanical Engineering (IWM), RWTH Aachen, Aachen 52062, Germany;2. Pulsar Photonics GmbH, Kaiserstraße 100, Herzogenrath 52134, Germany;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China;1. Micron School of Materials Science & Engineering, Boise State University, 1910 University Drive, Boise, ID 83725, USA;2. Department of Chemistry, Carleton College, 1 North College Street, Northfield, MN 55057, USA |
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| Abstract: | The electrical properties of C/SiC composites could be used for online and in-situ damage monitoring. To investigate alternating current (AC) impedance response to damage in the C/SiC composites, monotonic and incremental cyclic tensile tests were performed. Both AC impedance and acoustic emission (AE) techniques were applied to clarify the damage evolution during the tests. The relationship between damage and electrical impedance response was investigated and validated via macroscopic equivalent circuit models. The effects of longitudinal deformation and damage on AC impedance characteristics, including impedance magnitude and phase angle, were obtained from the models. Results showed that the longitudinal deformation increases the impedance magnitude and the phase angle, and the damage causes the impedance magnitude to increase and the phase angle to decrease. The phase angle is significantly sensitive to fiber breakage, which makes the AC-based method more suitable for online damage monitoring and final failure warning. |
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| Keywords: | C/SiC composites Electrical impedance Damage monitoring Macroscopic equivalent circuit model |
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