1. 基于微观划痕的疲劳强度预测.
- Author
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丁明超, 张元良, 咸宏伟, and 王金龙
- Subjects
- *
HIGH strength steel , *TITANIUM alloys , *SQUARE root , *FORECASTING , *TRIANGLES - Abstract
Based on the observation of micro scratches， the cross section of the scratches has the geometric characteristics of triangle. Two principles which are direction-independent and length-independent were proposed for determining the projection area of micro scratches. Accordingly， a new parameter areaΔ was defined as the maximum square root of triangle area of micro scratch section， to describe fatigue damage quantitatively caused by the micro scratches. A modified fatigue strength model with the consideration of micro scratches was established by using the Murakami model and the term of areaΔ.The model was validated by the fatigue strength experiment of high strength steel FV520B-I and the existing data of Ti-6Al-4V titanium alloy from literature. The results showed that the model had a certain advantage of prediction accuracy in fatigue strength prediction. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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