Periodic tensile overloads in 2024-T3 Al-alloy

Tür, Yahya Kemal; Vardar, Öktem

doi:10.1016/0013-7944(95)00116-d

Cited by 28 publications

(17 citation statements)

References 12 publications

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“…Therefore, the residual overload‐affected zone of the former has a marked effect on the retardation of the following overload. Periodic overload tests on the crack growth showed that the minimum retarded crack growth rate occurred at 0.20 of overload induced monotonic plane strain plastic zone size for overload ratios between 1.3 and 1.65 3 . At a fixed overload ratio, the load interaction depended on the overload period and there existed the constant amplitude cycles leading to maximum interaction, or to minimum crack growth rate 4 .…”

Section: Introductionmentioning

confidence: 96%

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Corrosion fatigue crack propagation of an aluminum alloy under periodic overloads

Wang

Zheng

2011

Fatigue Fract Eng Mat Struct

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A B S T R A C T Periodic tensile overloads superposed on constant amplitude cycles were used on compact tension fracture mechanics specimens of an aluminum (Al-Cu-Mg) alloy. The delayed retardation of corrosion fatigue crack propagation in the low part of the Paris regime was investigated in a 3.5% NaCl environment. The aluminum alloy exhibits the intensive retardation effect of crack propagation under overload ratios from 1.3 to 2.0 and overload intervals from 10 2 to 10 4 cycles. The crack propagation under the periodic overloads can be treated as the base constant amplitude crack propagation, i.e. (da/dN) cf = B cf ( K − K thcf ) 2 . The periodic overloads decrease the crack propagation resistance coefficient of B cf , but have less effect on the threshold value of K thcf obtained by best fitting of this model. a = crack length a e = overload affected zone a = crack increment per overload period B = specimen thickness B cf = resistance coefficient of corrosion fatigue crack propagation CFCP = abbreviation of corrosion fatigue crack propagation C(T) = compact tension specimen (da/dN) cf = corrosion fatigue crack propagation rate under constant amplitude loading (da/dN) d = corrosion fatigue crack propagation rate under periodic overloads K, K max ,K OL = peak stress intensity factor and that of constant amplitude cycles and of overload cycles K = stress intensity factor range of constant amplitude cycles K thcf = threshold value of corrosion fatigue crack propagation N b = number of constant amplitude cycles P max ,P OL = peak load of constant amplitude cycles and overload cycles r = linear correlation coefficient r max ,r OL = peak plastic zone radius of constant amplitude cycles and of overload cycles R = stress ratio of constant amplitude cycles s = standard deviation U = retardation coefficient under periodic overloads σ y = yield strength η = overload ratio Correspondence: R. Wang.

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Section: Introductionmentioning

confidence: 96%

“…This loading and environmental history can have a major effect on predictions of fatigue or corrosion fatigue lifetimes in such applications. The effects of load interaction and load‐environment interaction are one of the most important problems many researchers have considered 1–4 …”

Section: Introductionmentioning

confidence: 99%

Corrosion fatigue crack propagation of an aluminum alloy under periodic overloads

Wang

Zheng

2011

Fatigue Fract Eng Mat Struct

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“…Yuen and Taheri 16 mention that if multiple tensile OLs are applied too closely or frequently, the FCP delay can be reduced or increased. On the other hand, Tür and Vardar 17 and Singh et al 18 . reported that overloads applied too close lead to crack acceleration because crack jumps at each overload exceed the retardation in the subsequent few baseline cycles.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation in API 5L X-70 pipeline steel longitudinal welded joints under constant and variable amplitudes

Beltrão

Castrodeza

Bastian

2010

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T Fatigue crack propagation (FCP) under constant and variable amplitude loading in basemetal (BM), weld metal (WM) and heat affected zone (HAZ) of longitudinal welded joints of an API X-70 pipeline steel was investigated. Constant amplitude loading tests were performed at R = 0.1 and 0.5, whereas for variable amplitude testing single peak tensile overloads (OLs) alternating between 75 and 100% of maximum load were applied at 2.5 mm intervals in crack growth. Results of SE(B) specimens tested under constant and variable amplitude loading revealed that BM, WM and HAZ regions subjected to R = 0.5 and low K-values presented the highest crack growth rates. At higher K values FCP rates in all the studied regions were similar and the R effect on FCP rate was no more observed. Crack growth retardation due to OLs was observed at the three studied regions, showing a decrease on the FCP delay with a decreasing on K.Keywords alternate tensile overloads; API 5L X-70 pipeline steel; fatigue crack propagation; longitudinal welded joints. N O M E N C L A T U R E a = crack length (mm) BM = base metal C = constant of Paris equation da/dN = fatigue crack propagation rate (mm/cycle) FCP = fatigue crack propagation HAZ = heat-affected zone K max = maximum stress intensity factor (MPa.m 1 2 ) K min = minimum stress intensity factor (MPa.m 1 2 ) K OL = stress intensity factor at overload (MPa.m 1 2 ) K op = crack opening stress intensity factor (MPa.m 1 2 ) n = constant of Paris equation N = number of cycles OL = single peak tensile overload R = stress ratio r OL = monotonic plastic zone size (mm) RS = reversed shear SAW = submerged arc welding SE(B) = three-point bending specimen WM = weld metal WM-L = tensile test specimen (longitudinal direction of weld) Correspondence: M. A. Neves Beltrão.

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“…For instance, Wheatley et al (1999) studied the effect of single tensile OL on the fatigue behavior of 316L steel, and found that the fatigue crack growth retardation increased greatly with increases in the OL magnitude and duration. Daneshpour et al (2009) Mills and Hertzberg (1976) and Lang and Marci (1999) to assess how OL interactions depended on the relative magnitude and spacing between OLs, and by Yildirim and Vardar (1990) and Tür and Vardar (1996) to assess the effect of OL frequency on the fatigue retardation. The present study attempts a direct measurement of the OLinduced plastic deformation (PD) in the thickness direction along the fatigue crack growth path in there different weld-repaired HSLA samples of 10 mm in thickness, and the corresponding fatigue crack growth.…”

Section: Introductionmentioning

confidence: 99%

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Zhang

Lü

et al. 2013

Journal of Materials Processing Technology

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Periodic tensile overloads in 2024-T3 Al-alloy

Cited by 28 publications

References 12 publications

Corrosion fatigue crack propagation of an aluminum alloy under periodic overloads

Corrosion fatigue crack propagation of an aluminum alloy under periodic overloads

Fatigue crack propagation in API 5L X-70 pipeline steel longitudinal welded joints under constant and variable amplitudes

Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

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