Eccentricity Effect in the Hole-Drilling Residual Stress Measurement

Návrat, Tomáš; Halabuk, Dávid; Vlk, Miloš; Vosynek, Petr

doi:10.4028/www.scientific.net/ddf.382.208

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Another factor which needed to be accounted for in the precision of the DIC measurements was the eccentricity of the hole. Measurement of the shape of the final milled shape provided quantitative estimates of this value of +/− 0.05 mm for both points T and C. The influence of this on the resulting stress/strain estimates has been the focus of previous research [65,66], which revealed that this value corresponds to a nominal increase in the relative error of 5%. Accordingly, the confidence limits of the DIC results were modified to account for this effect as shown in Figure 10.…”

Section: Resultsmentioning

confidence: 87%

A Novel Low-Cost DIC-Based Residual Stress Measurement Device

Arabul¹,

Lunt²

2022

Applied Sciences

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Residual stress often has a significant impact on part performance and lifetime. Existing measurement techniques using strain gauges or non-destructive methods are often expensive and time-consuming. This paper presents a low-cost, novel measurement device that uses digital image correlation with the hole-drilling method to quantify the magnitude and preferred orientation of these locked-in forces. A two-axis measurement device that rapidly drills and images the surface around the hole was developed to measure residual stresses as a function of depth with sub-millimetre resolution. Validation of the device and DIC methodology was performed using a four-point bending specimen and comparison with conventional strain gauge methods. The results showed strong correlations between the two measurement techniques, as well as the theoretical estimates. The total cost of production was estimated to be approximately £380, which is significantly cheaper than competitors. The device also substantially reduced the cost per measurement point (less than £1 vs. £50+) and shortened the experiment duration from 2 h per point to 45 min per measurement. A functional, rapid, economical device has been designed and produced, which is currently being used for residual stress analysis of industrial samples. The presented design is completely open-source, and the relevant links are provided.

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Section: Resultsmentioning

confidence: 87%

A Novel Low-Cost DIC-Based Residual Stress Measurement Device

Arabul¹,

Lunt²

2022

Applied Sciences

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“…The accuracy of residual stress evaluation depends on many factors. If the hole is drilled eccentrically, shape or diameter of drilled hole is different from considered ones, or there are extensive plastic deformations the error is produced during evaluation [3,4]. It is important to known which factors influence the evaluation of residual stresses and how strong this influence is.…”

Section: Introductionmentioning

confidence: 99%

The effect of third principal stress in the measurement of residual stresses by hole-drilling method

Halabuk

Návrat

2018

MATEC Web Conf.

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One of the most popular and widely used technique for measuring residual stresses is the hole-drilling method. By this method, it is possible to evaluate only biaxial residual stresses located in plane parallel to the surface, but some processes produce a triaxial stress state. For this reason, the evaluation of triaxial stress state by the method used for biaxial state was assessed in this paper. A hole-drilling experiment was simulated by the finite element method for two different stress states. The first stress state considered constant residual stresses in all directions. The second one considered constant residual stresses in a plane parallel to the surface and the residual stress in a direction perpendicular to the surface was equal to zero on the surface and increased with depth. Both states were simulated for various ratios of stress in a direction perpendicular to the stresses in plane. The obtained results show that residual stress in a perpendicular direction affects the evaluation of residual stresses in plane. If the residual stress in the perpendicular direction is high compared to stresses in plane, the error produced by the evaluation of triaxial stress state by the method for biaxial stress state can also be high. 1 Introduction

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Eccentricity Effect in the Hole-Drilling Residual Stress Measurement

Cited by 2 publications

References 6 publications

A Novel Low-Cost DIC-Based Residual Stress Measurement Device

A Novel Low-Cost DIC-Based Residual Stress Measurement Device

The effect of third principal stress in the measurement of residual stresses by hole-drilling method

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