理化检验-物理分册2024，Vol.60Issue(3)：4-9,15,7.DOI:10.11973/lhjy-wl202403002
柔度法测算三点弯曲试样疲劳裂纹长度的影响因素
Factors affecting the calculation of fatigue crack length in three-point bending specimens using the flexibility method
高宇昊 1王佳 1朱官朋 1房坤 1翟建飞1
作者信息
- 1. 中国船舶集团有限公司第七二五研究所, 洛阳 471023
- 折叠
摘要
Abstract
The flexibility method was used to calculate the fatigue crack length of three-point bending specimens with different thicknesses.Combined with the finite element simulation analysis method,the influence of factors such as specimen thickness,applicable conditions of the flexibility function relationship,material elastic modulus,crack front edge bending degree and extensometer gauge length on the accuracy of the flexibility method in calculating crack length was studied.The results show that a normalized actual crack length of no less than 0.3 was a necessary condition to ensure the accuracy of the flexibility method calculation results.When using the finite element method to simulate a straight through type crack and normalizing the simulated crack length to be no less than 0.3,the compliance function relationship had a high degree of agreement with the simulation results.When the thickness of the specimen was not greater than 40 mm,using the elastic modulus of the material in the flexibility function relationship could obtain a more accurate calculation result.As the thickness of the specimen increased,the angle of the crack leading edge arc increased,and the crack flatness decreased,resulting in the calculated crack length being smaller than the actual crack length.关键词
三点弯曲试样/柔度法/裂纹长度/有限元模拟/疲劳裂纹扩展试验Key words
three-point bending specimen/flexibility method/crack length/finite element simulation/fatigue crack propagation test引用本文复制引用
高宇昊,王佳,朱官朋,房坤,翟建飞..柔度法测算三点弯曲试样疲劳裂纹长度的影响因素[J].理化检验-物理分册,2024,60(3):4-9,15,7.
