The effect of single overloads in tension and compression on the fatigue crack propagation behaviour of short cracks

被引：17
|
作者：
Zhou, Xiang [1 ,2 ]
Gaenser, Hans-Peter [1 ]
Pippan, Reinhard [2 ,3 ]
机构：
[1] Mat Ctr Leoben Forsch GmbH, Roseggerstr 12, A-8700 Leoben, Austria
[2] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
[3] Univ Leoben, Dept Mat Phys, Jahnstr 12, A-8700 Leoben, Austria
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2016年 / 89卷
关键词：
Overload; Crack closure; Residual stress; Threshold of stress intensity; Effective threshold; FINITE-ELEMENT ANALYSIS; GROWTH; CLOSURE; THRESHOLD; METALS; STEEL;
D O I：
10.1016/j.ijfatigue.2016.02.001
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The crack propagation behaviour in cast quenched and tempered steel after one overload cycle in tension as well as in compression on short cracks is investigated in deep notched specimens. The overload cycle exhibits a significant influence on the fatigue life endurance, due to the formation of an overload plastic zones in front of the crack tip. The crack propagation after overload cycles is investigated by inspection of the fatigue threshold R-curve and fatigue crack propagation rate. Tension overload increased the long crack threshold and reduced the R-curve effect, whereas overloads in compression reduced the crack growth resistance and shifted the threshold value to larger crack extension. A simple FE simulation was also performed to investigate the variation in the contribution of plasticity induced crack closure during crack propagation after the overload. Macroscopic mechanistic and dislocation models are introduced to explain the results obtained. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：77 / 86
页数：10
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