scholarly journals Mean stress effect and fatigue crack closure in material from old bridge erected in the late 19th century

2019 ◽  
Vol 17 ◽  
pp. 198-205 ◽  
Author(s):  
Grzegorz Lesiuk ◽  
Stephane Sire ◽  
Muriel Ragueneau ◽  
J.A.F.O. Correia ◽  
Bruno A.S. Pedrosa ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
19Th Century ◽  
Crack Closure ◽  
Stress Effect ◽  
Mean Stress ◽  
Late 19Th Century ◽  
Fatigue Crack Closure ◽  
Mean Stress Effect

An Experimental Investigation About Fatigue Crack Growth Rate of Aluminum Alloy Considering Various Mean Stress

2015 ◽  
Author(s):  
Yoo Choi ◽  
Deok-Geun Kim ◽  
Jeong-Yeol Park ◽  
Kyoung-Seok Lee ◽  
Jae-Myung Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Stress Effect ◽  
Mean Stress ◽  
Mean Stress Effect

In general, aluminum alloy is a commonly used for liquefied natural gas (LNG) storage systems. In this regard, it is important to know exact mechanical properties at cryogenic temperature. There are many researches to assess mechanical properties of aluminum alloy, such as tensile strength, fatigue performance and fracture toughness. Fatigue crack growth rate (FCGR) is important to predict the service life. In particular, mean stress effect can significantly affect the fatigue life. In this regard, this study carried out by a series of FCGR test at five different stress ratios (R=0.1, 0.3, 0.5, 0.7 and 0.85). The major objective of this paper is to suggest a new model that can consider the mean stress effect on FCGR of aluminum alloy in a unified manner. A mean stress equation is incorporated into Paris’ law. In order to validate the model, FCGR test data of aluminum alloy is compared with Walker’s relationship. Compared to the other existing model, the new model is found to exhibit more accurate result compared to Walker model.

Energy response of S355 and 41Cr4 steel during fatigue crack growth process

2018 ◽  
Vol 53 (8) ◽  
pp. 663-675 ◽  
Author(s):  
Grzegorz Lesiuk ◽  
Mieczysław Szata ◽  
Dariusz Rozumek ◽  
Zbigniew Marciniak ◽  
José Correia ◽  
...  
Keyword(s):  
Experimental Data ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Propagation ◽  
Crack Growth ◽  
Stress Effect ◽  
Mean Stress ◽  
Mean Stress Effect ◽  
R Ratio ◽  
The Mean

In this research, a novel approach of the fatigue crack growth rate description has been proposed. Based on theoretical and experimental approach, the mean stress effect expressed by R-ratio is present in classical da/dN–Δ K diagram. According to energy approach – based on the irrevocably dissipated energy accumulated in material (hysteresis loop) during fatigue process – the mean stress effect can be minimalized. Experimental validation of the proposed model was performed using results of fatigue crack propagation data for S355 and 41Cr4 steels in terms of strain energy density parameter Δ S or cyclic J-integral range –Δ J. In contrast to the force approach based on Kmax (or Δ K), the energy parameters Δ S or Δ J represent unambiguously the fatigue crack propagation rate, without influence of mean stress effect – R-ratio. However, in near threshold range of kinetic fatigue fracture diagram, the energy parameter displays a slight dispersion of the experimental data. According to the crack closure theory and its U-Elber parameter, the dispersion of experimental data is decreased. Therefore, the crack closure effects have a high significance in energy model – similar to the ‘force approach’ based on Δ K concept.

A comparative study of fatigue crack closure

1977 ◽  
Author(s):  
J. RUEPING ◽  
B. HILLBERRY ◽  
S. METTLER ◽  
W. STEVENSON
Keyword(s):  
Fatigue Crack ◽  
Comparative Study ◽  
Crack Closure ◽  
Fatigue Crack Closure

Dislocation mechanisms of mean stress effect on cyclic plasticity

2004 ◽  
Vol 46 (7-8) ◽  
pp. 363-373
Author(s):  
Hai Ni ◽  
Zhirui Wang
Keyword(s):  
Cyclic Plasticity ◽  
Stress Effect ◽  
Mean Stress ◽  
Mean Stress Effect

scholarly journals Mean Stress Effect in Stress-Life for Hard Steels

2020 ◽  
pp. 106101
Author(s):  
D. Gaia da Silva ◽  
J.T. Lockwood ◽  
W. Liang ◽  
T.H. Topper
Keyword(s):  
Stress Effect ◽  
Mean Stress ◽  
Mean Stress Effect

Influence of casting defect and SDAS on the multiaxial fatigue behaviour of A356-T6 alloy including mean stress effect

2015 ◽  
Vol 80 ◽  
pp. 90-102 ◽  
Author(s):  
Mohamed Iben Houria ◽  
Yves Nadot ◽  
Raouf Fathallah ◽  
Matthew Roy ◽  
Daan M. Maijer
Keyword(s):  
Fatigue Behaviour ◽  
Multiaxial Fatigue ◽  
Stress Effect ◽  
Mean Stress ◽  
Casting Defect ◽  
Mean Stress Effect

An experimental study of loading parameters effect on fatigue crack closure in 12NC6 steel

2012 ◽  
Vol 46 ◽  
pp. 83-93 ◽  
Author(s):  
B. Ould Chikh ◽  
A. Imad ◽  
H.M. Meddah ◽  
B. Bouchouicha ◽  
M. Benguediab
Keyword(s):  
Experimental Study ◽  
Fatigue Crack ◽  
Crack Closure ◽  
Fatigue Crack Closure
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