Cyclic deformation behavior of as-extruded Mg–3%Al–1%Zn

Yin, Shuming; Yang, Haining; Li, S. X.; Wu, Shengwei; Yang, Fu

doi:10.1016/j.scriptamat.2007.12.020

Cited by 155 publications

(80 citation statements)

References 15 publications

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“…They suggested that the Coffin-Manson fatigue relation is not suitable for fatigue representation of AZ31B in stress-controlled tests. Yin et al [6] examined the hysteresis loop in plastic strain-controlled fatigue tests on AZ31B. They reported significant differences in the stress amplitudes resulting from tension and compression.…”

Section: Introductionmentioning

confidence: 99%

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

Kalatehmollaei

Mahmoudi-Asl

Jahed

2014

International Journal of Fatigue

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Due to different deformation mechanisms arising from limited slip systems in HCP wrought magnesium alloys, their yield and hardening in tension and compression are different. Consequently, the cyclic behavior of these alloys is asymmetric showing a non-Masing hysteresis. An elastic-plastic method of analysis is proposed in this paper to handle the pronounced asymmetry inherited by Mg wrought alloys. Samples machined from an extrusion piece of AZ31B were tested on a standard rotating bending machine at bending moment amplitudes ranging from 3.3 to 6.3 N·m. Tests were conducted under two conditions: as-extruded and stress-relived. As-extruded samples showed a higher fatigue limit due to beneficial residual stresses induced by the extrusion process. The proposed elasticplastic model was then applied to obtain the stress distribution in the tested specimens. Cyclic hystereses obtained from this analysis were used to estimate the elastic and plastic strain energy densities per cycle. An energy-life model for AZ31B was then employed in conjunction with the calculated hysteresis energies to predict fatigue life of AZ31B in rotating bending. The proposed model prediction results were in good agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

Kalatehmollaei

Mahmoudi-Asl

Jahed

2014

International Journal of Fatigue

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“…However, the different shapes become identical after the second cycle. For the extruded magnesium alloys, the hysteresis loops of the low cycle fatigue test loaded along the extruded direction were asymmetric due to twinning and detwinning effects [4,7]. When the fatigue test was started from compression, the specimen yielded at point B and then was strained to point C with a minimal change in the stress caused by the twinning effect.…”

Section: Methodsmentioning

confidence: 99%

“…Since the c/a ratio of the hexagonal close-packed (hcp) magnesium lattice is less than √ 3, extruded magnesium alloys, which have a strong basal texture, show large yield asymmetries between tension and compression due to the twinning effects during compression along the prior extruded direction [4][5][6][7][8][9]. This anisotropy of magnesium alloys affects their fatigue properties to a considerable extent.…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue properties and an energy-based approach for as-extruded AZ31 magnesium alloy

et al. 2011

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Low cycle fatigue tests were conducted to investigate the cyclic deformation behavior and the energy-based criterion of AZ31 magnesium alloy. The alloy exhibited an asymmetric hysteresis loop due to the twinning and detwinning effect. The cyclic stress responses showed cyclic hardening at all total strain amplitudes. To evaluate the plastic strain energy, the Halford-Morrow equation and a modified equation for magnesium alloy were compared. The effect of twinning on the total plastic strain energy dissipated during fatigue life was discussed. The variations of the twin and dislocation densities were also investigated using optical microscopy and transmission electron microscopy, respectively.

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“…When using Mg alloys as structural materials, it is very important to understand their fatigue characteristics [5]. After the Paris-Erdogan equation of fatigue crack propagation (FCP) rate was introduced, many studies on the three regimes were carried out, and their respective FCP mechanisms were examined [6].…”

Section: Introductionmentioning

confidence: 99%

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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Cyclic deformation behavior of as-extruded Mg–3%Al–1%Zn

Cited by 155 publications

References 15 publications

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

Low cycle fatigue properties and an energy-based approach for as-extruded AZ31 magnesium alloy

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

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