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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 9    September 2018

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Fatigue life prediction of workpiece with 3D rough surface topography based on surface reconstruction technology
LI Guo-wen(李国文)1, TANG Jin-yuan(唐进元)1, ZHOU Wei(周炜)1, 2, LI Lin(李林)1

1. State Key Laboratory of High Performance Complex Manufacturing, Central South University,Changsha 410083, China;
2. Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-cut Materials, Hunan University of Science and Technology, Xiangtan 411201, China

Abstract: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 (Sa) and fatigue life of the workpiece is studied with the proposed approach.

 

Key words: fatigue life; stress concentration; surface reconstruction technology; surface topography

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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