Experimental investigations of internal and effective stresses during fatigue loading of high-strength steel

Vucko, Flavien; Bosch, Cédric; Delafosse, David

doi:10.1016/j.msea.2014.01.016

Cited by 15 publications

(5 citation statements)

References 45 publications

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“…The stress concentration inside of the bend increases due to tensile loading, resulting in crack initiation [7]. Residual shear strain on the crystallographic slip planes in combination with repeated crack opening conditions, induces persistent slip bands and fatigue striations in this area [3]. Because of a high stress amplitude, multiple crack initiation sites can be observed on the fracture surface shown in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

“…From literature [3] it is found that tensional stresses are generally more critical for fatigue since they result in higher stress intensity and reduced growth resistance near the material surface. For this reason, micro cracks are most likely to initiate from the inside of the bending root.…”

Section: V-fatigue Testmentioning

confidence: 99%

“…The study showed the feasibility of lock-in thermography to monitor the crack growth of low-cycle fatigue tests and finite elements analysis to provide information of the multi-axial stress gradient in the material. Vucko et al [3] investigated the internal and effective stress evolution, on a microstructural level, of S690QL during fatigue loading. They have found that the internal stress depends on the formation of cells whereas athermal effective stress is mainly caused by the reduction of dislocation density.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Model Validation and Fatigue Behaviour of Cold-Formed High Strength Steel

Gothivarekar

Coppieters

Talemi

et al. 2018

The 18th International Conference on Experimental Mechanics

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Abstract:In the present paper, fatigue fracture behaviour of cold-formed High Strength Steel (HSS) S690QL are investigated. S690QL is often employed, in a pre-deformed state, for load-bearing applications, where cyclic service loads can be critical. Bending processes can induce residual plastic strain in bent areas and this changes the fatigue behaviour significantly. Traditional uniaxial dogbone testing cannot represent this multi-axial phenomenon properly and for this purpose a benchmark specimen is proposed, that is first bent and after subjected to fatigue loading. The bending process is modelled with a quasi-static Finite Element (FE) model, performed in the commercial code Abaqus. To validate the numerical model, a stereo Digital Image Correlation (DIC) set-up is used, capable of measuring the residual plastic strains in the specimen. The present article covers the validation of a cold-forming process followed by a preliminary fatigue analysis of S690QL.

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Section: Resultsmentioning

confidence: 99%

Section: V-fatigue Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Model Validation and Fatigue Behaviour of Cold-Formed High Strength Steel

Gothivarekar

Coppieters

Talemi

et al. 2018

The 18th International Conference on Experimental Mechanics

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Section: Microstructure Constituents Influencing Sscunclassified

A Review of the Factors That Can Increase the Risk of Sulfide Stress Cracking in Thermomechanical Controlled Processed Pipeline Steels

Hiew Sze Kei,

van Haaften,

Britton

et al. 2023

Adv Eng Mater

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This review aims to improve our understanding of the important factors which influence the susceptibility of thermomechanical controlled processed (TMCP) steels to sulfide stress cracking (SSC). Mechanisms involved in hydrogen embrittlement (HE) from three perspectives are focused on: the microstructure constituents of TMCP steels; environmental factors; and fracture mechanism of SSC. Microstructures are reviewed as they affect the diffusion and trapping of hydrogen that can reduce the resistance to fracture. Environmental factors discussed highlight that when exposed to an aqueous H2S environment, a sulfide layer can form and influence the ingress of hydrogen, and this is affected by pH, temperature, and H2S partial pressure. Fracture is influenced by the nature of the crack tip and the crack tip plastic zone during crack propagation, and hydrogen can significantly affect crack tip growth. This review provides a critical assessment of the interplay between these three factors and aims to provide understanding to enhance our engineering approaches to manage and mitigate against fracture of TMCP steels.

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“…The NA alloy presented cyclic stability followed by cyclic softening, while the DA alloy firstly showed cyclic hardening and then cyclic softening. The cyclic stress during LCF tests can be separated into effective and internal stress [15], which are two important parameters in characterizing LCF behaviors [35,36]. Figure 13a,b shows the evolution of the effective stress and internal stress of the alloy with the number of cycles (N) at different total strain amplitudes.…”

Section: Effect Of Precipitation States On the Cyclic Hardening/softementioning

confidence: 99%

Tuning Low Cycle Fatigue Properties of Cu-Be-Co-Ni Alloy by Precipitation Design

Tang

Kang

Liu

et al. 2018

Metals

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As material for key parts applied in the aerospace field, the CuBe Co -Ni alloy sustains cyclic plastic deformation in service, resulting in the low cycle fatigue (LCF) failure. The LCF behaviors are closely related to the precipitation states of the alloy, but the specific relevance is still unknown. To provide reasonable regulation of the LCF properties for various service conditions, the effect of precipitation states on the LCF behaviors of the alloy was investigated. It is found that the alloy composed fully of non-shearable γ precipitates has higher fatigue crack initiation resistance, resulting in a longer fatigue life under LCF process with low total strain amplitude. The alloy with fine shearable γ I precipitates presents higher fatigue crack propagation resistance, leading to a longer fatigue life under LCF process with high total strain amplitude. The cyclic stress response behavior of the alloy depends on the competition between the kinematic hardening and isotropic softening. The fine shearable γ I precipitates retard the decrease of effective stress during cyclic loading, causing cyclic hardening of the alloy. The present work would help to design reasonable precipitation states of the alloy for various cyclic loading conditions to guarantee its safety in service.

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Experimental investigations of internal and effective stresses during fatigue loading of high-strength steel

Cited by 15 publications

References 45 publications

Experimental Model Validation and Fatigue Behaviour of Cold-Formed High Strength Steel

Experimental Model Validation and Fatigue Behaviour of Cold-Formed High Strength Steel

A Review of the Factors That Can Increase the Risk of Sulfide Stress Cracking in Thermomechanical Controlled Processed Pipeline Steels

Tuning Low Cycle Fatigue Properties of Cu-Be-Co-Ni Alloy by Precipitation Design

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