Challenging the "ΔKeff is the driving force for fatigue crack growth" hypothesis

被引：18
|
作者：
Ortiz Gonzalez, Julian Andres [1 ]
Pinho de Castro, Jaime Tupiassu [1 ]
Meggiolaro, Marco Antonio [1 ]
Gomez Gonzales, Giancarlo Luis [1 ]
de Franca Freire, Jose Luiz [1 ]
机构：
[1] Pontifical Catholic Univ Rio de Janeiro, PUC Rio, R Marques de Sao Vicente 225, Rio De Janeiro 22451900, Brazil
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 136卷 / 136期
关键词：
Fatigue crack growth; Fatigue crack driving force; Crack-opening load; Effective stress intensity factor range; Crack closure; DAMAGE ACCUMULATION; CLOSURE; THRESHOLD; PARAMETER; KEFF;
D O I：
10.1016/j.ijfatigue.2020.105577
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Tests are used to verify the hypothesis "the fatigue crack growth (FCG) driving force is the effective stress intensity factor range Delta K-eff". The tests are performed measuring FCG rates in steel and aluminum C(T) and DC(T) specimens under fixed {Delta K, K-ma(x)} loading conditions and during FCG delays induced by single overloads. Crack-opening loads P-op are redundantly measured along the crack path in all tests, using independent near and far field strain-gages, as well as Digital Image Correlation (DIC) techniques. Finally, elastoplastic strain loops within the reverse plastic zone ahead of crack tips are measured using a stereo microscope DIC system.
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页数：11
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