Neutron diffraction analysis of the residual stress distribution in a bent bar

Ezeilo, A.N.; Webster, G. A.

doi:10.1243/0309324001514387

Cited by 11 publications

(8 citation statements)

References 10 publications

(7 reference statements)

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“…Residual stress measurements on the same specimen have also been made using the neutron diraction method by our collaborators at Imperial College [15] and these are also plotted in Fig. 6 for comparison.…”

Section: Resultsmentioning

confidence: 99%

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Measurement of residual stresses in beams and plates using the crack compliance technique

Nowell

Tochilin

Hills

2000

The Journal of Strain Analysis for Engineering Design

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The crack compliance method provides a useful extension to the range of techniques available for the measurement of residual stress fields. The method is most suitable for simple geometries where the stresses vary in one direction only (e.g. usually depth). This paper describes the application of the dislocation density method to the calculation of the compliance functions required for the analysis of experimental data (the surface strain changes as a slot is cut). In particular, the kernel functions appropriate to a specimen of finite thickness (i.e. a beam or a plate) are given. The use of the technique for this geometry, including the use of multiple strain gauges, is discussed. Some sample results are given for the case of a plastically bent beam and these are compared with predictions from beam theory and with neutron diffraction measurements.

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Section: Resultsmentioning

confidence: 99%

“…6 Residual stress distribution in the beam obtained from the experimental readings in Fig. 5 using the crack compliance method (ÐÐ), measured by neutron diraction [15] (Â) and predicted by simple beam theory and uniaxial stress±strain data (------)…”

Section: Resultsmentioning

confidence: 99%

Measurement of residual stresses in beams and plates using the crack compliance technique

Nowell

Tochilin

Hills

2000

The Journal of Strain Analysis for Engineering Design

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“…Three techniques are used to measure the residual stresses, deep hole drilling (DHD), 5 incremental centre hole drilling, (ICHD), 4 and neutron diffraction (ND). 9,12,20 The section on 'Reconstruction using finite element simulations' details the finite element analysis to predict the residual stresses and to simulate the measurement processes and to reconstruct the stresses. An analytical reconstruction method is developed also in the section 'Analytical residual stress reconstruction' and applied to the predicted residual stresses, the outcome of which is used as a reference case.…”

Section: Introductionmentioning

confidence: 99%

Measurement, analysis and reconstruction of residual stresses

Faghidian

Goudar

Farrahi

et al. 2012

The Journal of Strain Analysis for Engineering Design

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Residual stresses, created in a steel beam by elastic-plastic bending, are predicted using an approximate analysis and the finite element method. The predictions are compared to experimental measurements obtained from the application of incremental centre hole drilling, deep hole drilling and neutron diffraction methods. Finite element simulations of the incremental centre hole drilling and deep hole drilling methods applied to the predicted residual stresses permitted an assessment of their ability to reconstruct the stresses. An analytical reconstruction analysis using an Airy stress function together with boundary and equilibrium conditions is developed and applied to the predictions and measurements. The reconstruction of the predictions enabled a reference case to be developed and used to assess the application of the reconstruction process to experimental data. It is shown that satisfactory through depth residual stress profiles can be obtained, providing the errors are about the same of those found in the measurement techniques.

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“…Several residual stress measurement techniques exist. They include noninvasive such as the X-ray diffraction (XRD) [1,2] and the neutron diffraction (ND) [3,4] or semi-invasive such as the incremental centre-hole drilling (ICHD) [5][6][7] and the deep-hole drilling (DHD) [8][9][10] technique. The XRD and ICHD measure near surface residual stresses whereas the ND and DHD measure stresses deep into metal parts.…”

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confidence: 99%

Advances in analysis of total uncertainties in a semi‐invasive residual stress measurement method

Hossain

Zheng²,

Goudar

2020

Strain

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The ability to characterise residual stress distribution accurately and over different length scales, particularly deep into an engineering part, plays a significant role in assessing structural integrity. Two most commonly used techniques to measure residual stress fields deep into engineering components include neutron diffraction (ND) and deep‐hole drilling (DHD). As the measurements depend on several physical quantities, they are susceptible to error. The error or uncertainties may turn substantial and compromise the suitability of the results. Although noninvasive, the neutron diffraction technique is neither readily available nor portable and is limited to approximately 60‐mm‐thick specimen; errors associated with results become unacceptable at greater flight paths. Moreover, a mock‐up representing the engineering component is normally used in the ND technique. In contrast, the DHD technique is portable and measures residual stresses with high spatial resolution. An error propagation technique was applied to develop an error analysis procedure taking into consideration various stages of the DHD method and successfully applied to different DHD measurements. An essential feature comprising the effect of plasticity due to the creation of reference hole in the DHD procedure has not yet been taken into account in the error analysis procedure. This paper briefly describes how the uncertainties due to the creation of the initial reference hole can be determined. The effect of plasticity in the drilling procedure is quantified in this study. This error is combined with other sources of error and formulated to determine the total error. An incremental DHD technique was used to measure the complex triaxial residual stress field in an as‐welded circular disc, and the measured data were used to illustrate the total error using the error analysis method developed in the study.

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Neutron diffraction analysis of the residual stress distribution in a bent bar

Cited by 11 publications

References 10 publications

Measurement of residual stresses in beams and plates using the crack compliance technique

Measurement of residual stresses in beams and plates using the crack compliance technique

Measurement, analysis and reconstruction of residual stresses

Advances in analysis of total uncertainties in a semi‐invasive residual stress measurement method

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