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所属单位：能源与动力学院

发表刊物：JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY

关键字：HCF strength Notch geometry TC4 Stress concentration Critical distance size effect

摘要：Studying the effect of different geometric features of machined notch on the fatigue strength and critical distance has an important guiding role to understand the critical distance size effect and to predict the HCF strength of turbine engine fan blades after FOD. Systematically experimental investigations of geometrical characteristic effects on the 106 cycle fatigue strength and critical distance for TC4 machined notched plates at stress ratios of R = 0.1 have been conducted. 123 specimens, including unnotched plates and three different types of notched plates (V-notches, U-notches and C-notches) with various notch root radii, depths and angles have been considered. The results indicate that the notch with small radius can significantly lead to high stress concentration and greatly reduce the HCF strength, while the notch angle and notch depth can affect the HCF strength to a certain extent. The Kt related model does not apply to describe the critical distance size effect perfectly. The critical distance has linear relationship with the notch root radius but no significant correction with the notch depth or notch angle. The findings of this study are beneficial for the size effect modeling and later fatigue strength evaluating of TC4 notched components.

ISSN号：1738-494X

是否译文：否

发表时间：2017-10-01

合写作者：戴嘉旭,Bao, Zhenqiang,宋迎东

通讯作者：宋迎东,胡绪腾