东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (5): 693-699.DOI: 10.12068/j.issn.1005-3026.2020.05.014

• 机械工程 • 上一篇    下一篇

基于微观划痕的疲劳强度预测

丁明超1, 张元良1, 咸宏伟1, 王金龙2   

  1. (1.大连理工大学 机械工程学院, 辽宁 大连116023; 2.大连海事大学 轮机工程学院, 辽宁 大连116026)
  • 收稿日期:2019-07-25 修回日期:2019-07-25 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 丁明超
  • 作者简介:丁明超(1990-),男,山东日照人,大连理工大学博士研究生; 张元良(1959-),男,辽宁大连人,大连理工大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51875082); 中央高校基本科研业务费专项资金资助项目(DUT17ZD230); 宁夏回族自治区重点研发计划项目(2018BDE02045).

Fatigue Strength Prediction Based on Micro Scratches

DING Ming-chao1, ZHANG Yuan-liang1, XIAN Hong-wei1, WANG Jin-long2   

  1. 1.School of Mechanical Engineering, Dalian University of Technology, Dalian 116023, China; 2.Marine Engineering College, Dalian Maritime University, Dalian 116026, China.
  • Received:2019-07-25 Revised:2019-07-25 Online:2020-05-15 Published:2020-05-15
  • Contact: ZHANG Yuan-liang
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摘要: 对微观划痕进行截面观察,确定截面具有三角形的几何特征.提出了适用于确定微观划痕投影面积的两原则:方向无关和长度无关.据此,建立了微观划痕疲劳损伤参数areaΔ,定义为多条微观划痕中截面三角形面积平方根的最大值.最后,结合areaΔ和Murakami理论,提出了基于微观划痕的疲劳强度模型.利用高强度钢FV520B-I疲劳强度实验和Ti-6Al-4V钛合金现有文献数据对模型进行验证,结果表明该模型具有一定的疲劳强度预测精度优势.

关键词: 微观划痕, 疲劳损伤参数, Murakami理论, 投影面积, 疲劳强度预测

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.

Key words: micro scratch, fatigue damage parameter, Murakami theory, projection area, fatigue strength prediction

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