Structural fatigue investigation of transverse surface crack growth in rail steels and thermite welds subjected to in-plane and out-of-plane loading

Liu, Yang; Tsang, Kin Shun; Hoh, Hsin Jen; Shi, Xiaopeng; Pang, J.H.L.

doi:10.1016/j.engstruct.2019.110076

Cited by 22 publications

(15 citation statements)

References 25 publications

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“…Thus, the life for welded joints and components is dominated by fatigue crack growth. Further, it illustrates the reliability and popularity of fatigue strength and fatigue life assessments for different failure modes in welded joints (Zhang et al, 2018;Ahola et al, 2019a;Chapetti and Steimbreger, 2019;Liu et al, 2020). The contribution of either fatigue crack initiation or propagation onto the fatigue life is strongly influenced by the material properties and loading conditions.…”

Section: Introductionmentioning

confidence: 89%

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Song

Liu

et al. 2021

Front. Mater.

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Welding of steel is a technique frequently used in practical engineering applications; however, their mechanical performance is strongly dependent on the physical metallurgical status of the weldments. In the present study, fully reversed, strain-controlled low-cycle fatigue (LCF) tests were conducted on 10CrNi3MoV steel and its undermatched weldments with strain amplitudes varying from Δε = ±0.5 to ±1.2%. Both base metal and weldments exhibited softening behavior at the beginning of the cyclic stage. Numerical investigations of cyclic stress–strain evolutions of the materials have been studied by the cyclic plastic model considering nonlinear hardening. The continuous damage mechanics (CDM) theory based on the experimental hysteresis stress–strain energy concept was employed to illustrate LCF failure, including damage initiation and deterioration. The damage mechanics approach calibrates the material parameters from the measured fatigue life for initiation and growth stages. Afterward, the combination of material cyclic plastic parameters and damage parameters was implemented to predict the LCF life. Good agreement can be observed between the experimental results and the FE results based on the CDM approach. Finally, the damage evolution of the materials under different strain amplitudes by this approach was assessed.

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Section: Introductionmentioning

confidence: 89%

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Song

Liu

et al. 2021

Front. Mater.

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“…However, these analyses of failure mode only aim at specific weld joints size. Details of the fracture mechanics approach and the applications in terms of fatigue failure issues for different types of welded joints and components were exhibited in previous studies, [22][23][24][25][26][27][28][29][30] including the model extension for specific welded joints, residual stress effect, failure mode effect, geometry differences, and loading modes. Some literature works have been devoted to understanding residual stress on fatigue crack growth (FCG) and the fatigue strength of welded joints.…”

Section: Introductionmentioning

confidence: 99%

Fatigue fracture assessment of 10CrNi3MoV welded load‐carrying cruciform joints considering mismatch effect

Song

Liu

et al. 2021

Fatigue Fract Eng Mat Struct

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Fatigue experiments and numerical simulations based on the linear elastic fracture mechanics (LEFM) theory were conducted on the evenmatched (EM) and undermatched (UM) 10CrNi3MoV load-carrying cruciform welded joints (LCWJs). The study firstly experimentally investigated the fatigue crack growth rate (FCGR) of base metal, EM, and UM weldments. The corresponding Paris parameters as essential input data are provided to assess the fatigue crack propagation behavior for weld toe and weld root failure caused by notch stress concentration variations. On the one hand, the stress intensity factors (SIFs) at weld toe and weld root were calculated considering the effects of LCWJ specimen geometries, initial crack types, and sizes. The comparisons between simulated results and standards analytical solutions were executed, which exhibit good accordance. It proved that the fatigue fracture simulation procedure based on LEFM is appropriate for the fatigue assessment of LCWJs. Eventually, it conducted the parametric analysis by predicted S-N curves, which included in the weld length, initial crack shape, initial crack size, penetration length, and materials fracture parameter, to explore some safety assessment reference lines for both failure modes of LCWJ.

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“…It shows that the shape changing of mould will significantly improve the service cycles of thermite welding. The continuously welded joints are the weak points of the rail [28][29][30][31]. The past studies showed that more than 60% of rail failures are resulted from welded joints failures [32] and among these welding failures thermite welding was the most frequent compared with other welding methods [33].…”

Section: Figure 2-10: Test Plan For Mechanical Tests Of Thermite Weld Metalmentioning

confidence: 99%

“…The welding process causes localized changes of material characteristics across the welded joints, causing the assembled rails susceptible to fatigue failures [58]. It is found that around 60~80% of rail weld failures occur at the heat affected zone (HAZ) [28,29], especially at the fusion line [30,31]. Based on the literature review of Chapter 2, the comprehensive material characterizations of thermite welded rail joints have not been clearly revealed.…”

Section: Problem Specificationmentioning

confidence: 99%

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Structural integrity assessment of rail steel failure modes and mechanism

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Structural fatigue investigation of transverse surface crack growth in rail steels and thermite welds subjected to in-plane and out-of-plane loading

Cited by 22 publications

References 25 publications

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Fatigue fracture assessment of 10CrNi3MoV welded load‐carrying cruciform joints considering mismatch effect

Structural integrity assessment of rail steel failure modes and mechanism

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