Short fatigue crack behaviour of LZ50 railway axle steel under multi-axial loading in low-cycle fatigue

Liang, Zongxia; Yang, Bing; Qin, Yuwen; Xiao, Shoune; Yang, Guangwu; Zhu, Tao; Gao, Ning

doi:10.1016/j.ijfatigue.2019.105366

Cited by 20 publications

(10 citation statements)

References 50 publications

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“…Its material properties are shown in Table 1. Referring to the previous studies [13][14][15], the material presents the typical ferrite and pearlite structure and the rich pearlite banded structure distributed along the rolling direction. The specimens employed in this study were machined to a smooth funnel shape with a minimum diameter of 6 mm, and the radius of curvature is 50 mm according to ASTM standard E466-15 [16], which were shown in Figure 1.…”

Section: Materials and Specimensmentioning

confidence: 71%

Study on Short Fatigue Crack Behaviour of LZ50 Steel Under Non-Proportional Loading

et al. 2020

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The low cycle fatigue tests using the replica technique for LZ50 steel under non-proportional cyclic loading were carried out, and eight groups of effective test data were obtained. The evolution behaviour of short cracks was studied based on the effective short cracks criterion. The results show that short cracks generally originate in the grain or along the grain boundary. At the microstructural short crack stage, the crack propagation is influenced strongly by the microstructure of the material, and the growth rate of the short crack slows down several times according to the number of obstacles encountered. At the physical short crack stage, the crack propagation breaks through the banded structure of pearlite. Thus, the dominant effective short fatigue crack is formed, and the crack growth rate increases rapidly. Based on the modified parameters of the uniaxial short crack model, an approach is presented to calculate the growth rate of short cracks under multi-axial non-proportional loadings, and the new model can consider the non-proportional factor F. The fitting results of the multi-axial microstructural obstacles model are compared with test data. The comparison results show that this model can reflect the trend of short fatigue crack propagation rate under non-proportional loadings.

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Section: Materials and Specimensmentioning

confidence: 71%

Study on Short Fatigue Crack Behaviour of LZ50 Steel Under Non-Proportional Loading

et al. 2020

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“…For crack under multiaxial loading conditions, the

normalΔ J

value of the crack propagation direction can be calculated by integrating hysteresis loop 24 . In the study of the

normalΔ J

model in different mixing modes under tension‐torsional loading, research 25–27 considered mixed Mode

normalI

‐

II

normalI

‐

III

, and research 20,28 considered mixed Mode

normalI - II - III

.…”

Section: Introductionmentioning

confidence: 99%

Parameter estimation in multiaxial fatigue short crack growth model using hierarchical Bayesian linear regression

Zhao

Yan

2022

Fatigue Fract Eng Mat Struct

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Multiaxial fatigue failure is the most common problem in engineering structures. It is worth noting that short crack growth accounts for most of the fatigue life. Hence, it is necessary to study the short crack growth models for multiaxial fatigue life assessment. The primary focus of this study is to develop a hierarchical Bayesian linear regression method to estimate parameters in multiaxial fatigue crack growth model. The Bayesian method is used to estimate the intercept and slope of the regression equation for each loading path and ensemble test datasets. The method of this work was demonstrated on three multiaxial fatigue crack growth datasets. The main results obtained in this paper were that the parameters of the multiaxial fatigue crack growth model changed significantly with different loading paths, and the parameters of the model depended on the multiaxial loading path.

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“…In recent years, the interest in the study of fatigue strength of railway axles has significantly increased [1]- [4]. The crack opening load is mostly determined under both low and high cycle fatigue by various experimental techniques [5]- [9] and numerical methods [10]- [14].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation Technique for Evaluation of Opening Stresses Under High Plasticity

Rashid

Imran

Arif

et al. 2021

Journal of Manufacturing Science and Engineering

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The crack closure phenomenon is important to study as it estimates the fatigue life of the components. It becomes even more complex under low cycle fatigue (LCF) since under LCF high amount of plasticity is induced within the material near notches or defects. As a result, the assumptions used by the linear elastic fracture mechanics (LEFM) approach become invalid. However, several experimental techniques are reported on the topic, the utilization of numerical tools can provide substantial cost and time-saving. In this study, the authors present a finite element simulation technique to evaluate the opening stress levels for two structural steels (25CrMo4 and 30NiCrMoV12) under low cycle fatigue conditions. The LCF experimental results were used to obtain kinematic hardening parameters through the Chaboche model. The finite element analysis (FEA) model was designed and validated, following the fatigue crack propagation simulation under high plasticity conditions using ABAQUS. Crack opening displacement vs. stress data was exported from ABAQUS, and 1.5% offset method was employed to define opening stress levels. Numerical simulation results were compared with the experimental results obtained earlier through the digital image correlation (DIC) technique. To conclude, FEA could be a valuable tool to predict crack closure phenomena and, ultimately, the fatigue life of components. However, analysis of opening stresses using crystal plasticity models or extended finite element method (XFEM) tools should be explored for a better approximation in future studies.

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Short fatigue crack behaviour of LZ50 railway axle steel under multi-axial loading in low-cycle fatigue

Cited by 20 publications

References 50 publications

Study on Short Fatigue Crack Behaviour of LZ50 Steel Under Non-Proportional Loading

Study on Short Fatigue Crack Behaviour of LZ50 Steel Under Non-Proportional Loading

Parameter estimation in multiaxial fatigue short crack growth model using hierarchical Bayesian linear regression

Finite Element Simulation Technique for Evaluation of Opening Stresses Under High Plasticity

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