Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method

Halabuk, Dávid; Návrat, Tomáš

doi:10.1007/s11340-021-00765-y

Cited by 4 publications

(7 citation statements)

References 6 publications

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“…Practically speaking, these parts are flat enough to have insignificant errors using a flat‐plate assumption. Recently, Halabuk and Návrat [ 43 ] studied the influence of the radius of curvature on the measurement errors, and results in Table 1 show that radius of curvature of 100 mm introduced an average error on the order of 0.5%. In our studied case, the radii of curvature were larger than 2841 mm; therefore, the error of the residual stresses measurement should be less than 0.5% and can be ignored.…”

Section: Resultsmentioning

confidence: 99%

Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses

Faucheux

Miao

Lévesque

et al. 2021

Strain

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Aluminium skins on the lower wings of most commercial aircraft are shaped using shot peen forming. This process, which involves bombarding the skins with hard shot, uses nonuniform plastic flow to induce curvatures—in the same way that differential expansion makes metal bilayers bend when heated. Here, we investigate experimentally how constraining conditions affect the final shape of peen formed parts. We report peen forming experiments for 4.9‐mm‐thick rectangular 2024–T3 aluminium sheets of different aspect ratios uniformly shot peened on one face with a low intensity saturation treatment. Some specimens were free to deform during peening while others were elastically prestressed in a four‐point bending jig. For each aspect ratio and prestress condition, residual stresses were measured near the peened surface with the hole drilling method. Additional residual stress profiles were also obtained with the slitting method. The residual stress measurements show that the progressive deformation of unconstrained specimens had the same effect as an externally applied prestress. For the peening conditions investigated, this progressive deformation caused unconstrained strips to exhibit curvatures 33% larger than identical strips held flat during peening. Furthermore, we found that the relative importance of material anisotropy and geometric effects did determine the bending direction of unconstrained specimens.

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Section: Resultsmentioning

confidence: 99%

Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses

Faucheux

Miao

Lévesque

et al. 2021

Strain

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“…Before training, the data set was randomly divided into two subsets: the training subset, which contained 85% of the states and was used to compute the gradient and update the weights and biases of the network, and the validation subset, which contained 15% of the states and was used to monitor data overfitting. The training process, 3 which involves adjusting network weights and biases to optimize network performance, was performed in MATLAB software by the Levenberg-Marquardt backpropagation training algorithm with the mean squared error performance function [13]. Since each network training session starts with different initial weights and biases and different divisions of the data set into the training and validation subsets, different solutions can be found for the same problem.…”

Section: Neural Network In Correction Proceduresmentioning

confidence: 99%

“…The outputs from the transfer function y (i) k become the inputs of neurons in the next layer. The above-mentioned algorithm can be written in matrix form as: where ( 14) a (1) = w (1) ⋅ X + b (1) (15) a (2) = w (2) ⋅ y (1) + b (2) (16) a (3) = w (3) ⋅ y (2) + b (3)…”

Section: Neural Network In Correction Proceduresmentioning

confidence: 99%

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Universal Procedure for Correction of Plasticity Effect in Hole-Drilling Uniform Residual Stress Measurement

Halabuk

Návrat

2022

Exp Mech

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Background The hole-drilling method is a well-known and widely used technique for the determination of residual stresses, but is limited to materials with linear elastic behaviour. This can be a problem when high residual stresses are measured, since a local yielding can occur due to stress concentration around the drilled hole. Objective If the residual stress exceeds about 80% of the material yield stress, the error caused by the plasticity effect becomes significant. In order to correctly evaluate high uniform residual stresses, a universal procedure for a correction of the plasticity effect is introduced. Methods The procedure uses a neural network and is capable of correcting any combination of uniform residual stresses with magnitudes up to the material yield stress. It also covers a wide range of material parameters, hole diameters, and strain gauge rosettes and it is independent of the orientation of the strain gauge rosette. Results The correction procedure was tested by more than a million randomly generated stress states that covered the entire range of input parameters and performs remarkably well, since the error of the corrected residual stresses is negligible even for the states with residual stress magnitudes equal to the material yield stress. Conclusions The proposed correction extends the application range of the hole-drilling method to high uniform residual stresses and therefore can be very useful for practical measurements.

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“…These methodologies (through-hole and incremental blind hole) are covered by the ASTM E837 standard [4,5], which provides a reference for the implementation of the method, including best practices and calculation instructions to obtain the calibration coefficients. The implementation of this measurement technique can, however, require attention to certain details that are disregarded by the standard, such as the plasticity effect [6][7][8], possible small thickness of the plate in which the residual stress needs to be measured [9], the possibility of a chamfer at the bottom of the hole [10], and imperfect local planarity of the specimen, such as when the residual stress measurement is performed at the external surface of a cylindrical shaft [11]. Another source of uncertainty is the hole's eccentricity; however, this can be corrected provided that the eccentricity itself is accurately known [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Determination with the Hole-Drilling Method on FDM 3D-Printed Precurved Specimen through Digital Image Correlation

Santus,

Neri,

Romoli

et al. 2024

Applied Sciences

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The hole-drilling method (HDM) is a common technique used for the determination of residual stresses, especially for metal alloy components, though also for polymers. This technique is usually implemented with strain gages, though other methods for determining the fields of displacements are quite mature, such as the use of digital image correlation (DIC). In the present paper, this combined methodology is applied to a 3D-printed PLA precurved specimen that is flattened in order to impose a bending distribution which can be considered known with a reasonable accuracy. The back-calculated stress distribution is in agreement with the expected (imposed) bending stress, however, a converging iterative procedure for obtaining the solution is introduced and discussed in the paper.

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Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method

Cited by 4 publications

References 6 publications

Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses

Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses

Universal Procedure for Correction of Plasticity Effect in Hole-Drilling Uniform Residual Stress Measurement

Residual Stress Determination with the Hole-Drilling Method on FDM 3D-Printed Precurved Specimen through Digital Image Correlation

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