Thermographic analysis of the fatigue heating process for AZ31B magnesium alloy

Guo, Shuai; Zhou, Yiqing; Zhang, Hongxia; Yan, Zhifeng; Wang, Wenxian; Sun, Kun; Li, Yuanda

doi:10.1016/j.matdes.2014.08.052

Cited by 24 publications

(22 citation statements)

References 21 publications

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“…The dynamic recrystallization is believed to cause the grain refinement during the fatigue process [ 21 ]. The specimen did not undergo macroscopic plastic deformation during the stress-controlled cyclic loading, and the surface temperature of the specimen was below 50 °C [ 27 ]. Therefore, the DRX mechanism in this study is different from the conventional hot deformation such as rolling and extruding process [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Ratcheting Strain and Microstructure Evolution of AZ31B Magnesium Alloy under a Tensile-Tensile Cyclic Loading

Yan

Wang

et al. 2018

Materials

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In this paper, studies were conducted to investigate the deformation behavior and microstructure change in a hot-rolled AZ31B magnesium alloy during a tensile-tensile cyclic loading. The relationship between ratcheting effect and microstructure change was discussed. The ratcheting effect in the material during current tensile-tensile fatigue loading exceeds the material’s fatigue limit and the development of ratcheting strain in the material experienced three stages: initial sharp increase stage (Stage I); steady stage (Stage II); and final abrupt increase stage (Stage III). Microstructure changes in Stage I and Stage II are mainly caused by activation of basal slip system. The Extra Geometrically Necessary Dislocations (GNDs) were also calculated to discuss the relationship between the dislocation caused by the basal slip system and the ratcheting strain during the cyclic loading. In Stage III, both the basal slip and the {11−20} twins are found active during the crack propagation. The fatigue crack initiation in the AZ31B magnesium alloy is found due to the basal slip and the {11−20} tensile twins.

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Section: Resultsmentioning

confidence: 99%

Ratcheting Strain and Microstructure Evolution of AZ31B Magnesium Alloy under a Tensile-Tensile Cyclic Loading

Yan

Wang

et al. 2018

Materials

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“…The method even fails to generate a proper value of fatigue limit with the data of Ref. [33] as shown in Fig. 10, because the original loci of T rstab versus r a presents too much zigzag.…”

Section: First Iteration Second Iterationmentioning

confidence: 99%

“…Whereas, Risitano's method does not take into account the temperature rising for applied stresses below fatigue limit and only utilizes one line to characterize the data of temperature rapid rising stage and the intersection of the line and x-axis is thought to be fatigue limit [24][25][26][27][28]. Those two graphic methods have been successfully applied to many kinds of materials and structural components, such as steels [29][30][31], magnesium alloy [32,33], composite materials [34][35][36][37][38][39][40][41], welded joints [42][43][44][45], riveted components [46] and components with holes [47,48]. The literature indicates that both Luong's method and Risitano's method make it possible to acquire fatigue limit within a short time and can be used for almost any stress ratio or specimen shape.…”

Section: Introductionmentioning

confidence: 99%

Rapid evaluation of fatigue limit on thermographic data analysis

Huang

Pastor

Girard

et al. 2017

International Journal of Fatigue

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Based on infrared thermography, the graphic methods such as Luong's method and Risitano's method are proved to be rapid and efficient for fatigue limit determination comparing to conventional methods. However, the determination procedure involves visual inspection so contains man-made uncertainties, which restricts their usage. In the present paper, we propose three new treatment methods in terms of relation curve between experimental temperature response (or dissipated energy) and the applied stress amplitude so as to determine the fatigue limit with uniqueness. Those three methods were all evaluated by applying to the experimental data from literature and the error of results were discussed and analyzed. In addition, numerical experiments were carried out to investigate the influence of loading stepped length and random error on each new treatment method.

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“…As a result, metallic materials do not exhibit truly infinite fatigue life [4][5][6][7][8][9]. Therefore, each load cycle must necessarily introduce a certain amount of irreversible degradation, albeit small, in the material regardless of the amplitude of stress [10][11][12][13]. Indeed, as demonstrated by Esin and Jones [10], at low stress levels a material experiences inhomogeneous local plastic deformations.…”

Section: Introductionmentioning

confidence: 99%