Laser surface-contouring and spline data-smoothing for residual stress measurement

Prime, Michael B.; Sebring, R. J.; Edwards, John; Hughes, D.J.; Webster, Peter J.

doi:10.1007/bf02428177

Cited by 153 publications

(113 citation statements)

References 18 publications

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“…The optimum knot spacing was selected by calculating stresses for spacings of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm. An error was determined by comparison of the stress at each node to that of a coarser spacing, following the methodology detailed by Prime et al (2004).…”

Section: The Contour Methodsmentioning

confidence: 99%

“…The contour method requires clamping of both sides of the specimen securely and symmetrically about the cut plane, to prevent movement of the component as stresses relax during cutting. In addition secure and symmetrical clamping reduces cutting induced plasticity and reduces the elastic cut tip deformation error, which is called the "bulge error" (Prime et al, 2004;Prime and DeWald, 2013).…”

Section: The Contour Methodsmentioning

confidence: 99%

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Quantification of residual stresses in electron beam welded fracture mechanics specimens

Kapadia

Davies

Pirling

et al. 2017

International Journal of Solids and Structures

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Residual stress measurements have been made in a range of electron beam welded samples to study how the weld induced residual stresses redistributed during fabrication of compact tension, C(T), specimens. The samples were manufactured from Type 316H stainless steel in the ex-service material condition and in material which had been preconditioned by inducing 8% plastic strain. Measurements made using neutron diffraction, slitting and the contour method were generally in good agreement and showed residual stress components of up to three times the base material's yield strength existed in the samples. When sectioning a sample to perform the contour method, large elastic deformations occurred at the cut tip due to the large residual stresses present. A correction was applied to the measured surface displacements to account for this deformation. Neutron diffraction measurements were made at various stages of the fabrication process, which showed significant stress redistribution occurred as the welded samples were machined into C(T) specimens.However the tensile stresses near the crack tip of the C(T) specimens remained large and could significantly influence subsequent crack growth tests. Highlights Electron beam welding is shown to produce repeatable residual stress fields in thick samples

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Section: The Contour Methodsmentioning

confidence: 99%

Section: The Contour Methodsmentioning

confidence: 99%

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Kapadia

Davies

Pirling

et al. 2017

International Journal of Solids and Structures

View full text Add to dashboard Cite

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“…Tee-join welded [56,57], quenched and impacted thick plates [58], cold-expanded hole [43] and aluminium alloy forging [8]. It offers improvements over conventional relaxation methods of measuring residual stresses [59,60].…”

Section: Contour Methodsmentioning

confidence: 99%

“…The method was first published in detail in 2001, where the contour method was numerically verified by 2D finite element (FE) simulation and experimentally validated on a bent steel beam having a known residual stress distribution [60]. The potential of the contour method was later demonstrated on a 12-pass TIG BS4360 steel weld to measure a complex 2D stress variation across the weld section [56]. The result obtained from the contour method was in excellent quantitative agreement with the outcome measured by a completely different technique non destructive neutron diffraction.…”

Section: Contour Methodsmentioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

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Residual stresses occur in many manufactured structures and components. Large number of investigations have been carried out to study this phenomenon and its effect on the mechanical characteristics of these components.Over the years, different methods have been developed to measure residual stress for different types of components in order to obtain reliable assessment. The various specific methods have evolved over several decades and their practical applications have greatly benefited from the development of complementary technologies, notably in material cutting, full-field deformation measurement techniques, numerical methods and computing power. These complementary technologies have stimulated advances not only in measurement accuracy and reliability, but also in range of application; much greater detail in residual stresses measurement is now available. This paper aims to classify the different residual stresses measurement methods and to provide an overview of some of the recent advances in this area to help researchers on selecting their techniques among destructive, semi destructive and non destructive techniques depends on their application and the availabilities of those techniques. For each method scope, physical limitation, advantages and disadvantages are summarized. In the end this paper indicates some promising directions for future developments.

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“…The contour method of residual stress measurement is a relatively new method that, whilst destructive, has significant advantages over many other techniques [1][2][3][4][5][6][7]. A stressed component is cut into two parts using wire electro-discharge machining (WEDM).…”

Section: Introductionmentioning

confidence: 99%

Minimization and Mitigation of Wire EDM Cutting Errors in the Application of the Contour Method of Residual Stress Measurement

Ahmad

Fitzpatrick

2015

Metall Mater Trans A

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The contour method of residual stress measurement relies on the careful application of wire electro-discharge machining (WEDM) for the cutting stage. Changes in material removal rates during the cut lead to errors in the final calculated values of residual stress. In this study WEDM cutting parameters have been explored to identify the optimum conditions for contour method residual stress measurements. The influence of machine parameters on the surface roughness and cutting artefact of the contour cut are discussed. It has been identified that the critical parameter in improving the surface finish is the spark pulse duration. A typical cutting artefact and its impact on measured stress values has been identified and demonstrated for a contour cut in a welded marine steel. A procedure is presented to correct contour displacement data from the influence of WEDM cutting artefacts, and is demonstrated on the correction of a measured weld residual stress. The corrected contour method improved the residual stress magnitude up to 150 MPa. The corrected contour method results were validated by X-ray diffraction, incremental centre hole drilling and neutron diffraction.

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Laser surface-contouring and spline data-smoothing for residual stress measurement

Cited by 153 publications

References 18 publications

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Methods of measuring residual stresses in components

Minimization and Mitigation of Wire EDM Cutting Errors in the Application of the Contour Method of Residual Stress Measurement

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