수치적 방법을 이용한 3차원 거친 표면의 마모 해석

• Published in: Tribology and Lubricants Vol. 36; no. 4; pp. 232 - 243
• Main Authors: 김윤지(Yunji Kim), 서준호(Junho Suh), 김봉준(Bongjun Kim), 유용훈(Yonghun Yu)
• Format: Journal Article
• Language: Korean
• Published: 한국트라이볼로지학회 2020
• Subjects: 기계공학; running-in(길들임); sliding wear(미끄럼 마모); rough surface(거친 표면); DC-FFT method(DC-FFT 방법); numerical analysis(수치해석); DC-FFT
• ISSN: 2713-8011; 2713-802X
• DOI: 10.9725/kts.2020.36.4.232

It is essential to predict the amount of wear and surface parameters for a surface where relative motion occurs. In the asperity-based model for wear prediction, only the average contact pressure can be obtained. Hence, the accuracy of wear analysis is poor. In this study, DC-FFT is used to obtain the pressure of each node, and wear analysis is performed by considering the effect of the pressure gradient. The numerical surface generation method is used to create Gaussian, negatively skewed, and positively skewed surfaces for wear analysis. The spatial and height distributions of each surface are analyzed to confirm the effectiveness of the generated surface. Furthermore, wear analysis is performed using DC-FFT and Archard's wear formula. After analysis, it is confirmed that all peaks are removed and only valleys remain on the surface. The RMS roughness and Sk continue to decrease and Ku increases as the cycle progresses. It is observed that the surface parameters are significantly affected by the radius of curvature of the asperity. This analysis method is more accurate than the existing average wear and truncation models because the change in asperity shape during the wear process is reflected in detail.