Origin of prestrain-induced cyclic-strain hardening: Multi-scale experimental characterizations and simulations of 7075 aluminum alloy

Zhu, Zhenyu; Chai, Guocai; Zhang, Junliang; Li, Xiaotao; Huang, Yanyan; Zhang, Jie; Yu, Chao; Wang, Qingyuan

doi:10.1016/j.matdes.2024.112711

Cited by 2 publications

(1 citation statement)

References 47 publications

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“…Based on the analysis of numerous literature reports (cf also [26][27][28][29][30][31][32] and many others), it can be concluded that the impact of initial deformations on the fatigue life largely depends on the load conditions occurring after the initial deformation. In the case of stress-controlled cycles (σ a = const.…”

Section: Introductionmentioning

confidence: 99%

Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens

Mroziński,

Piotrowski,

Egner

2024

Materials

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S420M steel subjected to strain-controlled low-cycle fatigue does not exhibit a period of cyclic properties stabilization. The maximum stress on a cycle continuously drops until fracture. For this reason, it is difficult to plan experimental research for different types of control in such a way that their results can be considered comparable. The aim of this paper is to present and discuss the results of tests conducted in various conditions of low-cycle fatigue of S420M steel specimens, both undeformed and pre-strained. In both loading conditions, after initial deformation, a significant change in the cyclic properties of steel described by the parameters of the hysteresis loop was observed. Also, the fatigue life of the pre-strained specimens appeared to be different from unstrained specimens and was affected by the test loading conditions. The reduction in life under controlled stress conditions was attributed to the increase in the extent of plastic deformation and stress and the occurrence of creep.

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Section: Introductionmentioning

confidence: 99%

Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens

Mroziński,

Piotrowski,

Egner

2024

Materials

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Coupling life prediction of bending very high cycle fatigue of completion strings made of different materials using deep wise separable convolution

Zhu,

Chen,

et al. 2024

Fatigue Fract Eng Mat Struct

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This article predicts bending very high cycle fatigue (VHCF) life of three typical nickel‐based alloys SM2550, BG2532, and G3 used for completion strings. Fatigue tests were conducted on the three alloys using an ultrasonic fatigue system at a frequency of 20 kHz. The results showed that the fatigue strength ranges of the three alloys were markedly different, reflecting their different sensitivities to fatigue loading. Scanning electron microscope observations revealed numerous fatigue crack origins with internal decohesion in the fatigue source region. To achieve unified prediction of the fatigue life for the three alloys, a prediction model based on deep learning was built with inputs including fatigue initiation quantity, cleavage facet size, and other fatigue fracture characteristics. It was found that single source feature was insufficient to obtain satisfactory prediction accuracy for all alloys, while multifeature coupling integration could significantly improve the prediction precision, enabling reliable prediction of alloy fatigue life. This study provides new insights into bending VHCF life prediction.

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Origin of prestrain-induced cyclic-strain hardening: Multi-scale experimental characterizations and simulations of 7075 aluminum alloy

Cited by 2 publications

References 47 publications

Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens

Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens

Coupling life prediction of bending very high cycle fatigue of completion strings made of different materials using deep wise separable convolution

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