期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 214, 期 8, 页码 1617-1626出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2014.03.009
关键词
Laser; Thermal damage; Metallic materials; Acoustic emission; Ensemble empirical mode decomposition
资金
- National Natural Science Foundation of China [71101090]
- Shanghai Top Academic Discipline Project Management Science and Engineering
- Shanghai Municipal Education Commission Project [13YZ080]
A detection method of laser-induced thermal damage-surface burn, rehardening and residual stress, was studied in this work. Artificial thermal damage was produced to various steels, e.g., AISI 1045, ASTM A36 and AISI 304, by virtue of laser irradiation. The aim of the present work is to identify thermal damage through sensor and feature extraction techniques. Acoustic emission(AE) sensor and ensemble empirical mode decomposition(EEMD) method were employed for this purpose. A de-noising method was proposed to eliminate noises from original AE signals, based on EEMD. Quantified thermal damage features were obtained. Results evidenced a strong correlation between AE features, i.e., RMS value of the reconstructed acoustic emission signal, and surface burn, residual stress value, as well as hardness of steels. The present work could be used as a potential and indirect approach for thermal damage detection. (C) 2014 Elsevier B.V. All rights reserved.
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