Analysis of the Geometric Shape of the Cutter in Ring-core Measurement

Menda, František; Šarga, Patrik; Lipták, Tomáš; Trebuňa, František

doi:10.1016/j.proeng.2014.12.156

Cited by 6 publications

(12 citation statements)

References 5 publications

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“…Assuming no equibiaxial strain component, the combined strain t is equal to e 2 , equation 3, thus it is negative too. According to equation (9), the combined stress T, which is equal to the shear stress t 13 , and the combined strain t have opposite sign, thus confirming the accurate definition of the last of equation 3. On the contrary, if the second grid is aligned with the bisector of a quadrant with opposite sign coordinates (second or fourth quadrant), the second grid strain and the shear stress have the same sign, and then the opposite definition of the last of equation (3) is required, in agreement with the ASTM standard.…”

Section: Outline Of the Integral Methodsmentioning

confidence: 67%

“…When matrices a, b are available, the residual stress distribution of any experimental case can be deduced from the measured strains by solving linear systems (9). The elements a ij , b ij of the just defined calibration matrices for ring-core are calculated and provided in the next section.…”

Section: Outline Of the Integral Methodsmentioning

confidence: 99%

“…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%

“…The matrices for the integral method according to 0.5-mm resolution of the 3D model were obtained by applying the procedure introduced in the previous section and reported in Table 3. Equation (9) was inverted to obtain the stresses, assuming as input the strains of the 3D FE analysis which was treated as a virtual residual stress experiment.…”

Section: Validation Of the Calibration Coefficientsmentioning

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%

See 4 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: Outline Of the Integral Methodsmentioning

confidence: 67%

Section: Outline Of the Integral Methodsmentioning

confidence: 99%

Section: Integer Multiple-step Coefficient Determinationmentioning

confidence: 99%

Section: Validation Of the Calibration Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 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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Residual Stress in Engineering Materials: A Review

et al. 2021

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The accurate determination of residual stresses has a crucial role in understanding the complex interactions between microstructure, mechanical state, mode(s) of failure, and structural integrity. Moreover, the residual stress management concept contributes to industrial applications, aiming to improve the product's service performance and life cycle. In this regard, the industry requests rapid, efficient, and modern methods to identify and control the residual stress state. This review article contains three main sections. The first section covers different residual stress determination methods and reports the advancements over the recent decade. The second section includes the role of residual stresses in the performance of a broad range of materials including metallic alloys, polymers, ceramics, composites, and biomaterials. This is presented by classifying different science areas dealing with residual stresses into two main groups, including “origins” and “effects” of residual stresses. The range of topics covered are “welding, machining, curing/cooling, and spray coating processes,” “medical and dental sciences,” and “fatigue and fracture mechanisms.” The third section summarizes various strategies to effectively control residual stresses through different manufacturing procedures. It is hoped that the data provided herein serves as a valuable up‐to‐date reference for engineers and scientists in the field of residual stress.

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Error and Uncertainty Analysis of Non-Uniform Residual Stress Evaluation by Using the Ring-Core Method

2016

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Like other mechanical methods used for the residual stress evaluation on a generic structural component, the Ring-Core Method (RCM) is potentially subjected to various error sources that in some particular experimental conditions can lead to significant errors and/or uncertainties on the computed residual stresses. The accuracy of the residual stresses computed by the RCM can be improved by a proper error analysis that allows the user to correct the systematic errors, as well as to evaluate the remaining stress uncertainty due to the random errors. Therefore, in order to give a contribution to the accuracy of the RCM, in the present work the list of the main error sources is presented and the effects of each source on the computed residual stresses, is examined in detail. Moreover, a systematic procedure for the residual stress uncertainty estimation is implemented. Finally, the application of the proposed procedure for the evaluation of the biaxial residual stresses field simulated by FEM on a simple steel plate, has allowed to detect the quantitative effects of the main error sources on the computed residual stresses, corroborating the usefulness of the procedure proposed for the correction of the systematic errors and the estimation of the uncertainty of the principal residual stress and their orientation

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Analysis of the Geometric Shape of the Cutter in Ring-core Measurement

Cited by 6 publications

References 5 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

Residual Stress in Engineering Materials: A Review

Error and Uncertainty Analysis of Non-Uniform Residual Stress Evaluation by Using the Ring-Core Method

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