Hole Drilling and Ring Coring

Schajer, G. S.; Whitehead, Philip S.

doi:10.1002/9781118402832.ch2

Cited by 31 publications

(26 citation statements)

References 34 publications

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“…All the measurements agree within uncertainty and show the factor of 1.4 anisotropy in residual stress near the center of the disk. Uncertainties are plotted for all measurements and were estimated using standard procedures for each technique (Noyan and Cohen, 1987;Prime and Hill, 2006;Schajer and Whitehead, 2013). The residual stresses also show another feature that might not be expected intuitively.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Amplified effect of mild plastic anisotropy on residual stress and strain anisotropy

Prime

2017

International Journal of Solids and Structures

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Highlights Axisymmetric indentation produced residual stresses in a disk of 2024 Aluminum  Mild plastic anisotropy caused severe anisotropy in residual stress and strain  Modeling showed that constraint effects caused the amplified stress anisotropy  Hookean elasticity explained the even more amplified residual strain anisotropy AbstractAxisymmetric indentation of a geometrically axisymmetric disk produced residual stresses by non-uniform plastic deformation. The 2024 aluminum plate used to make the disk exhibited mild plastic anisotropy with about 10% lower strength in the transverse direction compared to the rolling and through-thickness directions. Residual stresses and strains in the disk were measured with neutron diffraction, slitting, the contour method, xray diffraction and hole drilling. Surprisingly, the residual-stress anisotropy measured in the disk was about 40%, the residual-strain anisotropy was an impressive 100%, and the residual stresses were higher in the weaker direction. The high residual stress anisotropy relative to the mild plastic anisotropy and the direction of the highest stress is explained by considering the mechanics of indentation: constraint on deformation provided by the material surrounding the indentation and preferential deformation in the most compliant direction for incremental deformation. By contrast, the much larger anisotropy in residual strain compared to that in residual stress is independent of the fabrication process and is instead explained by considering Hookean elasticity. For Poisson's ratio of 1/3, the relationship simplifies to the residual strain anisotropy equaling the square of the residual stress anisotropy, which matches the observed results (2 ≈ 1.4^2). A lesson from this study is that to accurately predict residual stresses and strains, one must be wary of seemingly reasonable simplifying assumptions such as neglecting mild plastic anisotropy.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Amplified effect of mild plastic anisotropy on residual stress and strain anisotropy

Prime

2017

International Journal of Solids and Structures

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“…Significant residual stresses remained in the clad after heat treatment and this was partly attributed to the difference in thermal expansion between the base and cladding materials (see Table 2). The residual stress in the clad prior to the PTS test was measured using the ring core method [18], [34]. The through-thickness residual stress distribution is shown in Figure 15 for the circumferential stress direction ( ).…”

Section: Supplementary Datamentioning

confidence: 99%

Parametric design of scaled-down pressurised thermal shock test specimens using inelastic analysis

Coules

Orrock²,

Truman³

2017

Engineering Fracture Mechanics

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractPressurised thermal shock tests that simulate fracture conditions relevant to nuclear reactor pressure vessels are difficult to perform and require very large specimens. This study examines the feasibility of scaled-down specimens to allow easier testing. A series of finite element models was used to design scaled-down specimens that produce a crack-driving force, crack tip temperature trajectory and constraint conditions very similar to those which occurred in a previous large-scale spinning cylinder experiment known as NESC-1. It is shown that equivalent conditions can be achieved in much smaller specimens than NESC-1 using a practical set of testing parameters.Keywords: Thermal shock, finite element analysis, pressure vessel, spinning cylinder, J-integral Graphical abstractHighlights  Thermal shock tests for nuclear reactor pressure vessels can be miniaturised.  Models show that scaled-down tests can give equivalent fracture initiation conditions.  Specimens equivalent to the NESC-1 thermal shock test have been designed.

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“…Hole-drilling measurements can be performed in metal, composite and polymer materials [2]. The method also allows the test to be performed in different conditions, both in a laboratory and on field [3,4].…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in the Hole-Drilling Strain-Gage Method for Determining Residual Stresses

Valentini¹,

Bertelli²,

Benincasa³

et al. 2020

New Challenges in Residual Stress Measurements and Evaluation

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The hole-drilling Strain-Gage method is a widely used and cost-effective technique for the evaluation of residual stresses. The test method is standardized by ASTM E837-13a, which defines the scope, measurement range, minimum requirements of instrumentation, test procedure, and algorithms and coefficients for the computation of uniform and non-uniform stress distribution. However, the standardized test method presents some limitations regarding the scope and measurement range; moreover, some typical errors involved in the measurements are not taken into account, i.e., errors due to the hole eccentricity, the local plasticity, the intermediate thickness, and the hole-bottom chamfer, which can affect the results in some cases. Also, the standard does not provide the user with a complete guide regarding the evaluation of the uncertainty connected with this type of measurement. The paper presents a more general approach that allows the correction of some errors and overcomes and some limitations of the ASTM E837-13a test method, contributing to greater accuracy of the test results.

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Hole Drilling and Ring Coring

Cited by 31 publications

References 34 publications

Amplified effect of mild plastic anisotropy on residual stress and strain anisotropy

Amplified effect of mild plastic anisotropy on residual stress and strain anisotropy

Parametric design of scaled-down pressurised thermal shock test specimens using inelastic analysis

Recent Advancements in the Hole-Drilling Strain-Gage Method for Determining Residual Stresses

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