{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T05:31:16Z","timestamp":1767245476989,"version":"3.48.0"},"reference-count":26,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2025,12,29]],"date-time":"2025-12-29T00:00:00Z","timestamp":1766966400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["51875328"],"award-info":[{"award-number":["51875328"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Taian City Industrial Field Science and Technology Innovation Development Project","award":["2024GX064"],"award-info":[{"award-number":["2024GX064"]}]},{"name":"Shandong Provincial Key Research and Development Program","award":["2025TSGCCZZB0761"],"award-info":[{"award-number":["2025TSGCCZZB0761"]}]},{"name":"Shandong Provincial Key Research and Development Program","award":["2024TSGC0117"],"award-info":[{"award-number":["2024TSGC0117"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Micromachines"],"abstract":"<jats:p>In this paper, laser-assisted machining (LAM) of SiC ceramics was taken as the research object, and the different spectrum and energy spectrum characteristics and their changing trends of acoustic emission (AE) signals under processing states of brittleness, plasticity and thermal damage were analyzed. The numerical characterization of ceramic softening degree was indirectly realized by the energy spectrum characteristics of low-frequency band energy ratio, marking a methodological breakthrough in transitioning from qualitative analysis to quantitative detection for identifying plastic processing state. First, the surface morphology of the machined surface based on the single-factor experiment of laser power was analyzed, and three different processing states and ranges of laser power were determined, namely brittle state (0\u2013185 W), plastic state (185\u2013225 W) and thermal damage state (&gt;225 W). Then, the wavelet packet denoising and spectrum analysis of AE signals under different processing states were carried out to obtain the corresponding frequency of the maximum amplitude and the amplitude change trend of the characteristic frequency (515 kHz) in the high-frequency domain. Finally, the energy spectrum analysis of acoustic emission signals was carried out, and the method of indirect characterization of ceramic softening degree by low-frequency band energy ratio was proposed. This paper provides a numerical characterization method and theoretical guidance for the detection and identification of the plastic processing state of ceramic laser-assisted cutting.<\/jats:p>","DOI":"10.3390\/mi17010042","type":"journal-article","created":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T15:30:32Z","timestamp":1767195032000},"page":"42","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Experimental Study on Acoustic Emission Signals Under Different Processing States of Laser-Assisted Machining of SiC Ceramics"],"prefix":"10.3390","volume":"17","author":[{"given":"Chen","family":"Cao","sequence":"first","affiliation":[{"name":"School of Mechanical Engineering, Taishan University, Taian 271000, China"},{"name":"Key Laboratory for Advanced Forming Technology and Equipment, Key Laboratory of High-Efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jinan 250061, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yugang","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiukun","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Taishan University, Taian 271000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiao","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Taishan University, Taian 271000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,12,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"110166","DOI":"10.1016\/j.optlastec.2023.110166","article-title":"Laser drilling in silicon carbide and silicon carbide matrix composites","volume":"170","author":"Sun","year":"2024","journal-title":"Opt. 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