Variable amplitude loading in En8 (080M40) steel: A detailed experimental study of crack growth

被引:19
作者
Nganga, SP
James, MN
机构
[1] Sch. of Proc. and Mat. Engineering, University of the Witwatersrand, WITS 2050, Johannesburg
关键词
variable amplitude loading; crack closure; medium carbon (En8) steel;
D O I
10.1111/j.1460-2695.1996.tb00960.x
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The load interaction effects that occur under variable amplitude loading conditions following single peak overloads, low-high blocks and high-low blocks have been investigated on a commonly used structural steel. A detailed investigation has been carried out on long cracks which aims at developing and assessing the efficacy of a simple predictive model based on closure and plastic zone effects. The material was tested in a quenched and tempered condition. All the tests were carried out in the four point bending mode, in both the Paris regime and near the threshold, with overloads ranging from 10% to 100%. An attempt to relate crack closure to crack growth rates in the transient growth rate region (which follows a load change) was made. The trends observed for a wide range of loading parameters are presented.
引用
收藏
页码:207 / 216
页数:10
相关论文
共 17 条
[1]   TRANSIENT RETARDATIONS IN FATIGUE CRACK-GROWTH FOLLOWING A SINGLE PEAK OVERLOAD [J].
DAMRI, D ;
KNOTT, JF .
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 1991, 14 (07) :709-719
[2]   FRACTURE MODES ENCOUNTERED FOLLOWING THE APPLICATION OF A MAJOR TENSILE OVERLOAD CYCLE [J].
DAMRI, D ;
KNOTT, JF .
INTERNATIONAL JOURNAL OF FATIGUE, 1993, 15 (01) :53-60
[3]  
Elber W., 1971, AMAGE TOLERANCE AIRC, P230, DOI DOI 10.1520/STP486-EB
[4]   OBSERVATIONS ON EVALUATING FATIGUE CRACK CLOSURE FROM COMPLIANCE TRACES [J].
GARZ, RE ;
JAMES, MN .
INTERNATIONAL JOURNAL OF FATIGUE, 1989, 11 (06) :437-440
[6]  
HUDSON CM, 1961, D960 NASA
[7]  
Knott J. F., 1977, Metal Science, V11, P399
[8]  
KURIHARA M, 1987, CURR JAPANESE MATER, V1, P247
[9]  
LING MR, 1990, LR629 DELFT U TECH
[10]  
SCHIJVE J, 1960, 195 NRL MP NAT AER A