DETERMINATION OF FATIGUE CRACK INITIATION LIFE

被引：37
作者：
IBRAHIM, MFE
MILLER, KJ
机构：
来源：
FATIGUE OF ENGINEERING MATERIALS AND STRUCTURES | 1979年 / 2卷 / 04期
关键词：
D O I：
10.1111/j.1460-2695.1979.tb01093.x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Abstract— A reanalysis has been carried out on the results of Zachariah. An elastic‐plastic analysis based on S‐N data indicates that the mechanism of growth of very small cracks is similar to that expressed by linear elastic fracture mechanics, i.e. crack growth in mild steel is given by (Formula Presented.) where Δγp is the plastic shear strain range and a is the crack length. Crack initiation occurs within a single grain and crack propagation is given by the above equation for cracks which can be smaller than a few microns. The size of an initiated crack is a function of stress level varying from 0·1–1·0 μm in the high strain fatigue regime to 2·3 μm close to the fatigue limit. The period of crack initiation is negligible in the HSF regime whilst the initiation period can dominate lifetime at low stress levels. Copyright © 1979, Wiley Blackwell. All rights reserved
引用
收藏
页码：351 / 360
页数：10
相关论文
共 19 条
[1]  
Kunio T., Yamada K., (1979)
[2]  
Yokobori T., Et al., Initiation and propagation of fatigue cracks in unnotched specimens of high strength eutectoid steel, Rep. Res. Inst. Strength Fract. Mater. Tohoku Univ., 12, (1976)
[3]  
Kage M., Nisitani H., The effect of inclusions on the torsional fatigue of anisotropic rolled steel, Bull. JSME, 21, (1978)
[4]  
De Lange R.G., Fatigue crack propagation in steel 35 CD4 and 26 St aluminium alloy, Trans. Metall. Soc. AIME, 230, (1964)
[5]  
Baxter W.J., Exoelectron measurements of the rate of development of fatigue, Fatigue Engng Mater. Struct., 1, (1979)
[6]  
Haworth W.L., Holographic study of fatigue deformation and crack growth in metals, Fatigue Engng Mater. Struct, 1, (1979)
[7]  
Palmgren A.Z., Die Lebensdauer von Kugellagern, Z. Ver. dt. Ing., 68, (1924)
[8]  
Miner M.A., Cumulative damage in fatigue, J. appl. Mech., 12, (1945)
[9]  
Manson S.S., (1965)
[10]  
Gatts R.R., Application of a cumulative damage concept to fatigue, Journal of Basic Engineering, 83, (1961)
12