Estimation of Residual Stress Field Uniformity when Using the Ring-Core Method

Menda, František; Šarga, Patrik; Trebuňa, František

doi:10.4028/www.scientific.net/amr.996.325

Cited by 10 publications

(11 citation statements)

References 4 publications

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“…Non-uniform steps, for example, as initially proposed by Zuccarello, 6 and recently re-proposed by Menda et al 8,9 and Zuccarello et al, 10 can also be obtained from the large matrices introduced above. However, the depths need to be approximated with the 0.1-mm resolution.…”

Section: Integer Multiple-step Coefficient Determinationmentioning

confidence: 99%

“…Hole-drilling is a well-established procedure defined by internationally accepted standards. 1,2 Ring-core was introduced more than 20 years ago; [3][4][5][6] however, it was deeply investigated and developed only recently, especially in terms of sensitivity and uncertainty analysis, [7][8][9][10] and even applied at the microscale. 11,12 In hole-drilling, the material is removed at the centre of a rosette, and thus the relaxed strains are measured at the periphery of the hole, whereas in ring-core the strains are measured in the central internal region, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…21 Regarding hole-drilling, the calculation of the residual stresses, after having produced a hole in incremental depths and the relieved strains recorded, can be performed with the standard ASTM E837-13a 1 that applies the integral method. The same calculation procedure can be applied to elaborate the relaxed strains produced by ring-core, 8,10,22 since the axial symmetry of the problem and the grid layout according to the 0°-45°-90°scheme are the same. However, other numerical techniques for the residual stress determination have been proposed, such as the incremental strain method 21,23,24 or the influence function analytical technique as proposed by Beghini et al 13,14 for holedrilling.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses

Barsanti

Beghini

Santus

et al. 2018

The Journal of Strain Analysis for Engineering Design

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The ring-core technique allows for the determination of non-uniform residual stresses from the surface up to relatively higher depths as compared to the hole-drilling technique. The integral method, which is usually applied to the hole-drilling, can also be used for elaborating the results of the ring-core test since these two experimental techniques share the axisymmetric geometry and the 0-45-90 degrees layout of the strain gage rosette. The aim of this paper is at providing accurate coefficients which can be used for evaluating the residual stress distribution by the ring-core integral method. The coefficients have been obtained by elaborating the results of a very refined plane harmonic axisymmetric finite element model and verified with an independent 3D model. The coefficients for small depth steps were initially provided, then the values for multiple integer step depths were also derived by manipulating the high resolution coefficient matrices, thus showing how the present results can be practically used for obtaining the residual stresses according to different depth sequences, even non-uniform. This analysis also allowed the evaluation of the eccentricity effect which turned out to be negligible due to the symmetry of the problem. An applicative example was reported in which the input of the experimentally measured relaxed strains were elaborated with different depth resolutions, and the obtained residual stress distributions compared.

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Section: Integer Multiple-step Coefficient Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses

Barsanti

Beghini

Santus

et al. 2018

The Journal of Strain Analysis for Engineering Design

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show abstract

“…9 Recently, the ring core method has been explored by researchers. [10][11][12][13] Calibration coefficients for ring core were determined by Menda et al [10][11][12][13] for a model with 14 mm of the ring core notch inner diameter and 18 mm of outer diameter. 10 Authors also have reported the effect of trepan cutter geometry with respect to the slope at the bottom of cutting teeth on the calculation of residual stress.…”

Section: Introductionmentioning

confidence: 99%

To study the effect of stress magnitude and tool geometry on the calibration coefficients: Ring core technique

Giri

Pandey

Mahapatra

2017

Proceedings of the Institution of Mechanical Engineers, Part E:

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Ring core technique is widely used to measure the subsurface residual stresses in components. In the analytical evaluation of residual stresses by ring core technique, the calibration coefficients play the vital role for the correct estimation of residuals stresses. Calibration coefficients needed to evaluate the residual stresses by dry ring core technique have been determined with respect to varying ring core tool dimensions. The effect of the biaxial stress combinations and trepan tool diameters on the calibration coefficients was investigated. The trepanning effect of dry ring core process was also investigated through 3D finite element models. The finite element analysis was done to prepare a database of strains for the different stress combinations with respect to the depth of cut. After that the regression equations were developed to directly calculate the calibration coefficients for the material SS 304L. Furthermore, this finite element data was also used to develop the mathematical relations to calculate the residual stresses from the strain readings obtained in dry ring core process. Error estimation of residual stress calculation was also done for both analytical and regression models. The database of relations between residual stress and strains developed in the present study with respect to a given dimension of ring core tool was found to be adequate in estimating the residual stresses directly from the strain reading during dry ring coring.

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“…However the connections between experimental measurement and simulation studies is still not sufficient which is showed by lack of some international standard. Prerequisite for experimental usage of the Ring-Core method for evaluation of the residual stress components in material is the determination of adequate calculation coefficients and constants [1,2,3]. Sensing of the stress changes inside the material by the sensor attached at the top of the component is not suitable by using the classic Hook´s law.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Different Simulation Approaches in Ring-Core Method

Menda¹,

Šarga²,

Lipták³

et al. 2014

AJME

Self Cite

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Ring-Core, a semi-destructive method enables measurement of the residual stresses inside the material by the sensor attached at the top of the specimen. Such stress reconstruction requires proper determination of the calculation coefficients. Thus the simulation model for finite elements analyzes is created by means of two different commercial software. Subsequently both simulation results are compared experimentally by measurement on the specimen loaded by known uniaxial state of stress.

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Estimation of Residual Stress Field Uniformity when Using the Ring-Core Method

Cited by 10 publications

References 4 publications

Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses

Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses

To study the effect of stress magnitude and tool geometry on the calibration coefficients: Ring core technique

Comparison of Different Simulation Approaches in Ring-Core Method

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