Fatigue life prediction of workpiece with 3D rough surface topography based on surface reconstruction technology

• Published in: Journal of Central South University Vol. 25; no. 9; pp. 2069 - 2075
• Main Authors: Li, Guo-wen, Tang, Jin-yuan, Zhou, Wei, Li, Lin
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.09.2018; Springer Nature B.V
• Subjects: Engineering; Fatigue life; Fatigue tests; Interpolation; Life prediction; Materials fatigue; Metallic Materials; Reconstruction; Stress concentration; Surface properties; Surface roughness; Topography; 表面形貌; surface reconstruction technology; 表面重构技术; surface topography; 应力集中; stress concentration; fatigue life; 疲劳寿命
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-018-3896-3

The fatigue performance of a workpiece depends on its surface quality. In traditional fatigue life prediction, the effect of surface quality is commonly accounted for by using empirical correction factors, which is imprecise when safety is of great concern. For surface quality, the surface topography is an important parameter, which introduces stress concentration that reduces the fatigue life. It is not feasible to test the stress concentration of different surface topographies. On the one hand, it is time-consuming and high-cost, and on the other hand, it cannot reflect the general statistical characteristics. With the help of surface reconstruction technology and interpolation method, a more efficient and economic approach is proposed, where FE simulation of workpiece with the reconstructed surface topography is used as a foundation for fatigue life prediction. The relationship between surface roughness ( S a ) and fatigue life of the workpiece is studied with the proposed approach.