Application of Acoustic Emission Technology for Quantitative Characterization of Plasma-Sprayed Coatings Subjected to Bending Fatigue Tests
Application of Acoustic Emission Technology for Quantitative Characterization of Plasma-Sprayed Coatings Subjected to Bending Fatigue Tests
复制标题
声发射技术在弯曲疲劳试验中等离子喷涂涂层定量表征中的应用
DOI：
10.1007/s11666-018-0750-y
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发表时间：
2018
影响因子：
3.1
通讯作者：
Jin Guo
中科院分区：
文献类型：
--
作者：
Jing Jian nong;Dong Li hong;Wang Hai dou;Jin Guo
等离子喷涂涂层在工业上有着广泛的应用，例如，在易受高磨损和腐蚀损害的应用中，或在需要隔热的应用中。然而，这种涂层的失效行为对机械零件的使用安全有很大的影响。声发射(AE)技术因其在损伤演化的实时监测和对裂隙源的高度敏感性等方面的优势而备受关注。在本研究中，利用声发射方法监测了等离子喷涂涂层在三点弯曲疲劳试验下的损伤演化行为。采用参数化法、傅立叶分析和小波分析相结合的方法对涂层的损伤模式进行识别。分析结果揭示了两种不同峰值频率的裂纹模式(表面垂直裂纹和界面裂纹)。用有限元方法量化了裂纹的断裂应力和扩展行为，发现涂层厚度对其剥落有很大的影响。
Plasma-sprayed coatings are widely used in industry, e.g., in applications subject to high wear and corrosion damage, or requiring thermal insulation. However, the failure behavior of such coatings has a great influence on the service safety of mechanical parts. Acoustic emission (AE) has attracted much attention due to its proven usefulness for real-time monitoring of damage evolution and high sensitivity to fracture sources. In this study, the damage evolution behavior of a plasma-sprayed coating subjected to three-point bending fatigue tests was monitored using the AE method. A method combining parameterized, Fourier, and wavelet analysis was used to distinguish the damage modes in the coating. The analysis results revealed two crack modes (surface vertical crack and interface crack) with two different peak frequencies. A finite element method was used to quantify the fracture stress and propagation behavior of cracks, revealing that the thickness of the coating had a strong influence on its spalling.