Fatigue of 7075-T651 aluminum alloy under constant and variable amplitude loadings

Lee, E.U.; Glinka, G.; Iyyer, Nagaraja; Phan, Nam

doi:10.1016/j.ijfatigue.2008.11.013

Cited by 52 publications

(31 citation statements)

References 36 publications

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“…The values for ∆K th of the AZ31-F were 2.01 MPa√m, 1.80 MPa√m, 1.68 MPa√m and 1.64 MPa√m for R ratios of 0.1, 0.3, 0.5, and 0.75, respectively. It was found that the values of ∆K th gradually decreased with an increasing R ratio, which is in agreement with the previous data [17][18][19][20]. This shows that the ∆K th value of Al 2090 and Ti-6Al-4V decreased with an increasing R ratio in a vacuum [17][18][19].…”

Section: Resultssupporting

confidence: 90%

“…It was found that the values of ∆K th gradually decreased with an increasing R ratio, which is in agreement with the previous data [17][18][19][20]. This shows that the ∆K th value of Al 2090 and Ti-6Al-4V decreased with an increasing R ratio in a vacuum [17][18][19]. The ∆K th value of AZ61 and AZ91 also decreased with an increasing R ratio in air [20].…”

Section: Resultssupporting

confidence: 90%

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Fatigue crack propagation behavior of AZ31 Mg alloy in ultra-high vacuum

2011

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The fatigue crack propagation (FCP) behavior of extruded AZ31-F was examined in conjunction with crack closure phenomena. FCP experiments were carried out in an ultra-high vacuum system using a fatigue test machine under a constant load amplitude. To determine the effect of crack closure on the FCP rates, the crack closure levels were measured using the compliance method. The ∆K th values of the AZ31-F decreased with increasing load ratio. It was found that ∆K eff,th showed an almost constant value regardless of the load ratio.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 90%

Fatigue crack propagation behavior of AZ31 Mg alloy in ultra-high vacuum

2011

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“…The differences can be attributed to the interaction of overload and underload in the VAL, which resulted in higher fatigue life. Tensile overload in the Necking mark observed cycle caused crack retardation whereas compressive underload caused crack acceleration [18,31,32]. This study also found that ductility of aluminium alloy affected the load sequence effect.…”

Section: Methodssupporting

confidence: 57%

“…The load sequence has been shown to be affected mainly by the loading conditions, such as the magnitude and position of overloads/underloads in the sequence, arrangement of block loadings, stress ratio, and mean stress. These parameters affect the fatigue crack initiation and propagation, as well as the total number of cycles to failure [9,[17][18][19][20]. However, there is still a lack of discussion on how loading sequence effect is influenced by material behaviour.…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanical properties on load sequence effect and fatigue life of aluminium alloy

et al. 2017

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Most of the structural components in real applications are subjected to variable amplitude loading. The load sequence may have a significant effect on the number of cycles to failure. However, the relationship between the mechanical behaviour of material and the load sequence effects has scarcely been reported. Therefore, this paper discusses the influence of mechanical properties on the load sequence effect and fatigue life behaviour of aluminium alloys AA6061 and AA7075. Tensile and fatigue tests were performed according to ASTM E8 and ASTM E466, respectively. The variable amplitude loading signal was obtained from the engine mount bracket of an automobile in normal driving conditions. Constant amplitude loading, and high-to-low and low-tohigh spectrum loadings were derived from the variable amplitude loading to assess the effects of load sequence on fatigue life. The results showed that AA7075 has better fatigue life properties compared to AA6061. Both alloys were significantly influenced by load sequences. The number of cycles to failure for low-to-high spectrum loading is about 56 % higher than the CAL for AA6061 compared to about 82 % higher than the CAL for AA7075. Thus, it can be concluded that the load sequence effect was more pronounced on AA7075 compared to AA6061.

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“…Studies show that for metallic alloys, particularly aluminum, a NaCl-based corrosive medium tends to promote both retardation and acceleration of crack growth [1,12,[14][15][16]. It has been found that the result of corrosion may induce not only crack tip closure but also embrittlement due to the entry of hydrogen into the interstices of the alloy.…”

Section: Introductionmentioning

confidence: 99%