Influences of tensile pre-strain and bending pre-deflection on bending and tensile behaviors of an extruded AZ31B magnesium alloy

Ma, Zhichao; Zhao, Hongwei; Hu, Xiaoli; Cheng, Hongbing; Lü, Shuai; Zhang, Lin

doi:10.1016/j.matdes.2014.08.029

Cited by 16 publications

(6 citation statements)

References 23 publications

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“…Like the monotonic tensile stress-strain curves [66], cyclic stress-strain response is important for determining the properties of fatigue resistance and represents a major aspect in understanding the overall strain-controlled cyclic deformation comportment. It allows to provide a full description of the relationship between the flow stress and plastic strain amplitude under cyclic loading [21,22], which could be expressed as follows,…”

Section: Cyclic Stress-strain Curvementioning

confidence: 99%

Strain-controlled low cycle fatigue properties of a rare-earth containing ZEK100 magnesium alloy

Mokdad

Chen

2015

Materials & Design

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Section: Cyclic Stress-strain Curvementioning

confidence: 99%

Strain-controlled low cycle fatigue properties of a rare-earth containing ZEK100 magnesium alloy

Mokdad

Chen

2015

Materials & Design

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“…In order to accurately apply controllable bending load and meet the requirements of real-time monitoring of microstructure evolution of the composite bone structure under a microscope, an in situ horizontal bending tester integrating with an optical microscope was developed through appropriate modification of a developed three-point bending instrument. 15 As shown in Figure 1a, a planetary reducer, two-stage worm gears, and two ball-screws with left-and right-hand constituted a reduction mechanism with a large reduction ratio, which facilitated to realize the quasi-static bending at a low speed (<10 nm/s) and timely image acquisition with high-resolution. Especially, the ball-screws with left-and right-hand could ensure that the monitoring micro region was throughout inside the imaging field of view and did not move during the loading process.…”

Section: Methodsmentioning

confidence: 99%

In Situ Bending Reveals Simultaneous Enhancements of Strength and Ductility of Cortical and Cancellous Layers Induced by the Cartilage Layer

Huang

et al. 2021

ACS Omega

Self Cite

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The energy absorption and toughening effect of cartilage could effectively protect bone from damage, and the enhancement mechanisms of cartilage on deformation resistance or strength need to be revealed. Using a self-developed in situ bending tester integrated with an optical microscope, in situ bending of the composite bone structure consisting of the cartilage layer and cortical and cancellous layers was carried out, accompanied by simultaneously obtained continuous morphological changes in diverse deformation layers. Although the bending resistance of pure cartilage layer was only 0.3 N, the significant enhancements of bone strength and ductility induced by the cartilage layer were experimentally revealed, as the peak loads and ultimate bending deflections of the composite structure increased by 1.49-to 2.14-fold and 1.43-to 2.12fold, respectively. The scanning electron microscopy images of the composite bone structure at various locations with disparate stress conditions exhibited significant difference in crack sizes and degrees of tearing damage. The cartilage layer was verified to induce a layered tearing dimple feature to inhibit the crack propagation and further enhance the deformation resistance. The frequency shift comparison between the Raman spectroscopies of various microregions also indirectly verified the inhibition effect of the cartilage layer on the stress increment in the cortical layer.

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“…[2][3][4][5][6] In addition, a large prestrain in the plastic deformation stage, for example, necking stage, will cause great damage to materials. 7 During the prestrain process, dislocation walls, dislocation cells and so forth were formed, which increased the strength and affected the cyclic responses of the material. 8 The cyclic stress amplitude of prestrained 304 stainless steels was greater than the original specimen at the same strain amplitude, whereas most of them still presented three stages: cyclic hardening, cyclic softening and secondary hardening.…”

Section: Introductionmentioning

confidence: 99%

Comparison of low cycle fatigue behavior of 304 stainless steels induced by tensile and torsional prestrain

Jin

Liu

et al. 2020

Fatigue Fract Eng Mat Struct

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The effect of tensile and torsional prestrains on fatigue lives of 304 stainless steels is compared. The fatigue life as a function of prestrain amplitudes exhibits an ‘S’ curve, and the inflexion point of the S curve is affected by prestrain modes and cyclic strain amplitudes. An interesting phenomenon is that when the onset stress of secondary hardening reaches 300 MPa, intergranular martensite begins to be formed. Combining martensite distribution, fatigue life and cyclic stress responses, the onset stress of secondary hardening is proposed to reflect the location of martensite nucleation sites. Compared with tensile prestrain, torsional prestrain results in higher stress. In addition, higher prestrain and cyclic amplitudes also lead to higher cyclic stress and hence earlier nucleation of intergranular martensite. Furthermore, the influence mechanism of prestrain modes and cyclic strain amplitudes on the inflexion point of S curve is revealed.

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Influences of tensile pre-strain and bending pre-deflection on bending and tensile behaviors of an extruded AZ31B magnesium alloy

Cited by 16 publications

References 23 publications

Strain-controlled low cycle fatigue properties of a rare-earth containing ZEK100 magnesium alloy

Strain-controlled low cycle fatigue properties of a rare-earth containing ZEK100 magnesium alloy

In Situ Bending Reveals Simultaneous Enhancements of Strength and Ductility of Cortical and Cancellous Layers Induced by the Cartilage Layer

Comparison of low cycle fatigue behavior of 304 stainless steels induced by tensile and torsional prestrain

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