Stress evaluation of laser cladding coating with critically refracted longitudinal wave based on cross correlation function |
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Authors: | Bin Liu Shiyun Dong |
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Affiliation: | 1. Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2. National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China |
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Abstract: | Research on stress evaluation of laser cladding coating with critically refracted longitudinal wave was introduced in this paper. Two critically refracted longitudinal wave transducers with 5 MHz frequency, spacing between which was constant, were employed as signal emitter and receiver. Based on acoustoelastic equation deduction, relationship between the difference in time of flight and tensile stress is obtained. Combing with cross correlation theory, the difference in time of flight between stressed and unstressed critically refracted longitudinal signals was calculated. Results show that stress evaluation is affected by layer interface and anisotropic microstructure of laser cladding coating, precision of stress evaluation of laser cladding coating increases as step length increases until it attains one cycle. In addition, influence of waveform distortion caused by microstructure of laser cladding coating on stress evaluation is discussed. At last, verification test is carried out and the experimental result is well consistent with theoretical result. |
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Keywords: | Critically refracted longitudinal wave Stress evaluation Laser cladding coating Step length |
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