Measurement of residual-stress distribution by the incremental hole-drilling method

Niku-Lari, A.; J, Lu; Flavenot, J. F.

doi:10.1016/0378-3804(85)90023-3

Cited by 65 publications

(16 citation statements)

References 7 publications

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“…The calculation steps for the residual stress values were automatically adjusted along the depth of the drilled hole. The stresses are calculated from the measured strain by using the relation [23] , = E…”

Section: Hole-drilling-methodsmentioning

confidence: 99%

Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses

Maqbool

Bambach�

2019

JMMP

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The aim of this study is to analyze the co-relation between the geometrical accuracy of parts formed by single-point incremental forming (SPIF) and the resulting distribution of the residual stresses induced in the material as a function of the different process parameters of the SPIF process. The study was performed for a pyramidal frustum manufactured by varying the process parameters of SPIF, i.e., tool diameter, tool step-down, and wall-angle. The hole-drilling strain gage method was used to determine the residual stresses in the manufactured pyramids. Further, small strips were laser cut from the pyramids, and the curvature of the strips was measured. The curvature of the strips is a result of the intensity and distribution of the residual stresses, which in turn depends on the selected values of the process parameters. A validated numerical model of SPIF was used to determine the residual stresses parallel and perpendicular to the direction of tool motion at the center of a strip cut from the numerical model in clamped, unclamped, and trimmed states. Further, the change in the bending moment of a strip that occurred upon unclamping and trimming was calculated. Experimental and numerical investigations reveal that the most significant parameter in residual stress build-up and the reduction of geometrical accuracy is the wall angle. Upon unclamping, the highest change in the residual stresses and bending moment occurred with the largest tool step-down and tool diameter. Upon trimming, the magnitude of the residual stresses and bending moment changed the most with the largest tool step-down in both directions, whereas the change was highest with the smallest tool diameter in the transverse direction of the tool motion. Furthermore, upon trimming, the geometric deviations were highest with the large wall angles in the transverse direction of the tool motion. Overall, the effect of changing process parameters on the residual stress state and geometrical accuracy was more pronounced in the transverse direction of the tool motion.

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Section: Hole-drilling-methodsmentioning

confidence: 99%

Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses

Maqbool

Bambach�

2019

JMMP

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“…This method required the use of a finite element model of the experimental process to identify the laws connecting the value read at the surface of the part (where the gauge was stuck) with the change in residual stress at the bottom of the drilled hole. It allowed the well‐known coefficients of influence to be determined . Correlation coefficients were specific to each experimental configuration (hole diameter, plate thickness, rosette dimensions, etc.)…”

Section: Assessment Of Stress At the Edge Of A Cold Expanded Holementioning

confidence: 99%

Optimization of the Cold Expansion Process for Titanium Holes

et al. 2016

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Cold expansion of metallic holes is widely used in the aerospace industry for improving the fatigue performance of mechanical assemblies. To increase the efficiency of the process, it is worth considering the possibility of carrying out the expansion twice in succession in the same hole. This paper discusses the consequences of such an operation on a single titanium hole through a numerical and experimental study. More precisely, numerical modeling is developed in order to simulate cases where the expansion is carried out twice: in the same direction and in opposite directions. The residual fields are analyzed and the results compared with experimental results using incremental hole-drilling technique. Results show that double expansion may have a very positive impact on the homogeneity of the compressive fields.

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“…To increase the growth and development of LSP in the material processing industry, it is important to develop diagnostic techniques for in-situ and in-line monitoring and evaluation of the peening process. At present, the residual stresses in the material are measured using the incremental centre holedrilling (ICHD) technique or X-ray diffraction techniques [8,9]. ICHD technique requires the use of three (or six) element strain gauge rosette, precision milling guide, gauge circuits and data-reduction relationships to deduce the principal residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Acoustic signature of laser shock peening for a qualitative evaluation of residual stresses

et al. 2019

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Acoustic signals recorded from laser shock peening (LSP) of aluminium, titanium and stainless steel alloys were analysed for different laser pulse widths, energy and confinement conditions. In this paper, we report that different materials and conditions registered unique acoustic signatures. Further, the acoustic signatures in the time domain were transformed to the frequency domain and were fitted to a lognormal distribution, yielding a unique set of parameters for each material and set of conditions. These parameters were benchmarked using the measurements of residual stress by the incremental centre hole-drilling (ICHD) method. Detailed analysis of the acoustic signal reveals that this method once calibrated with few ICHD data, can identify successful peening of materials.

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Measurement of residual-stress distribution by the incremental hole-drilling method

Cited by 65 publications

References 7 publications

Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses

Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses

Optimization of the Cold Expansion Process for Titanium Holes

Acoustic signature of laser shock peening for a qualitative evaluation of residual stresses

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