Evaluation of residual stress in ferromagnetic steels based on residual magnetic field measurements

Roskosz, Maciej; Bieniek, Michał

doi:10.1016/j.ndteint.2011.09.007

Cited by 115 publications

(55 citation statements)

References 30 publications

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“…The effect of localized stress and yield should be even smaller. This variation is not sufficient to produce stray fields and field gradients reported by [5]. Indeed, the clamps of the tensile test machine were ferromagnetic, and their remanent induction was neither eliminated nor evaluated during the experiments by Roskosz and Bieniek.…”

Section: Discussion Of Resultsmentioning

confidence: 97%

“…The first, further referred to as 'E1', was performed by Roskosz and Bieniek and described in their paper [5]. Roskosz and Bieniek interpreted their results as a proof of a direct bidirectional Fig.…”

Section: Experimental Set-ups and Samplesmentioning

confidence: 99%

“…-it has been applied in various safety-critical components [2][3][4] -it has been claimed as capable of solving the essential problem of structural NDT, namely determining a local stress level from a fast and easily interpretable series of measurements in-situ [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Discussion of Derivability of Local Residual Stress Level from Magnetic Stray Field Measurement

Augustyniak

Usarek

2015

J Nondestruct Eval

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The NDT procedure dubbed 'metal magnetic memory' method and the related ISO 24497 standard has found wide industrial acceptance in some countries, mainly in Russia and China. The method has been claimed by some researchers (Roskosz and Bieniek in NDT&E Int 45:55-62, 2012; Wilson et al. in Sens Actuators A 135:381-387, 2007) as having potential for quantitative determination of local residual stress state in engineering structures, at least for some steel grades. This work presents a critical reexamination of a previous important study by Roskosz and Bieniek, who claimed to have found a direct relationship between local residual equivalent stress levels ranging from 0 to 50 MPa, and the stray field gradients in T/P24 steel sample placed in the Earth's ambient magnetic field. We reconstruct their experiment in a magnetic finite element simulation, computing stray magnetic field and its tangential gradients along the axis of the sample. Different combinations of remanent induction and relative magnetic permeability levels have been modeled, and the influence of geometrical discontinuity is quantified. In order to validate magnetic finite element methodology, a new experiment is presented, along with its numerical counterpart. The magnetic finite element method allowed to obtain a good quantitative correlation with well-controlled stray field measurements. It is demonstrated, that the residual stress level of order of 50 MPa is not the only factor, on which the stray field measurement depends. The geometrical discontinuity and the remanent induction contribute to a higher extent to the field amplitudes. Consequently we prove, that a bidirectional correlation between B Marek Augustyniak maugustyniak@mif.pg.gda.pl 1 Gdansk University of Technology, 80233 Gdansk, Poland 2 DES ART Ltd, 81366 Gdynia, Poland the magnetic field gradient and local stress levels cannot be determined because of at least three concurrent inseparable factors on which the measured stray field and its spatial gradient depends.

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Section: Discussion Of Resultsmentioning

confidence: 97%

Section: Experimental Set-ups and Samplesmentioning

confidence: 99%

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Discussion of Derivability of Local Residual Stress Level from Magnetic Stray Field Measurement

Augustyniak

Usarek

2015

J Nondestruct Eval

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“…The break-through presented in [116] (a function allowing to quantitatively deduce a residual stress from a stray field level) was later shown to be an overinterpretation [113].…”

Section: Research Trendsmentioning

confidence: 99%

Finite Element Method Applied in Electromagnetic NDTE: A Review

Augustyniak

Usarek

2016

J Nondestruct Eval

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The paper contains an original comprehensive review of finite element analysis (FEA) applied by researchers to calibrate and improve existing and developing electromagnetic non-destructive testing and evaluation techniques, including but not limited to magnetic flux leakage (MFL), eddy current testing, electromagnetic-acoustic transducers (EMATs). Premium is put on the detection and modelling of magnetic field, as the vast majority of ENDT involves magnetic induction, either as a primary variable MFL or a complementary phenomenon (EC, EMATs). FEA is shown as a fit-for-purpose tool to design, understand and optimise ENDT systems, or a Reference for other modelling algorithms. The review intentionally omits the fundamentals of FEA and detailed principles of NDT. Strain-stress FEA applications in NDT, especially in ultrasonography and hole-drilling methodology, deserve as well a separate study.

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“…It is assumed, that the distribution of the SMLF highlights areas of potentially pre-cracked and fatigued material zones. In addition, relation was reported between the SMLF and residual stress [3], hardness [4] and elastic/plastic deformation states [5]. Thus the SMLF detection could be a convenient method for evaluating areas of potential crack initiation.…”

Section: Introductionmentioning

confidence: 99%

Self-magnetic-leakage field detection using magneto-optical sensor technique

Stegemann

Sonntag

Kreutzbruck

et al. 2014

MATEC Web of Conferences

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Abstract. Measurement of spontaneous magnetic stray field signals has been reported to be a promising tool for capturing macro-scale information of deformation states, defects and stress concentration zones in a material structure. This paper offers a new method for self-magnetic leakage field detection using a magneto-optical (MO) handheld microscope. Its sensor has a dynamic field range between ±0.05 and ±2 kA/m and a lateral optical resolution of approx. 10 m. We examined flat tensile test specimens of metastable austenitic steel AISI 304. Static tensile tests were repeatedly interrupted at various predetermined states of strain and the magnetic information was measured by the MO system. Comparative measurements using a high-precision magnetic field GMRsensor, verify the outstanding capability of the MO microscope regarding spatial resolution of magnetic fields.

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Evaluation of residual stress in ferromagnetic steels based on residual magnetic field measurements

Cited by 115 publications

References 30 publications

Discussion of Derivability of Local Residual Stress Level from Magnetic Stray Field Measurement

Discussion of Derivability of Local Residual Stress Level from Magnetic Stray Field Measurement

Finite Element Method Applied in Electromagnetic NDTE: A Review

Self-magnetic-leakage field detection using magneto-optical sensor technique

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