Experimental determination of stress intensity factors due to residual stresses

Schindler, Hans-Jakob; Wan, Cheng; Finnie, I.

doi:10.1007/bf02317418

Cited by 82 publications

(52 citation statements)

References 11 publications

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“…Additional cuts can be made to find other stress components, in which case the overall procedure resembles the sectioning method [86 -88]. The slitting method can also be applied to estimate the stress intensity factor caused by residual stresses, which is very useful for fatigue and fracture studies [89].…”

Section: Other Destructive 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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Section: Other Destructive Methodsmentioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

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“…The deformation response of the structure after each incremental cut is measured using strain gauges placed at optimal locations. The residual stresses acting along the cutting plane are then back-calculated from the measured deformation history using either a series expansion method or a fracture mechanics approach [16,24,25].…”

Section: Slittingmentioning

confidence: 99%

“…Because the stress intensity factor (SIF) distribution in the CT blank was of particular interest for creep crack growth evaluation, the fracture mechanics approach was adopted for the data analysis. The advantage of this approach is that the SIF distribution as a function of the cut length can be directly and precisely determined without prior knowledge of the residual stresses [25] using see equation (5).…”

Section: Stress Back-calculationmentioning

confidence: 99%

Measurement of the Residual Stress Tensor in a Compact Tension Weld Specimen

et al. 2012

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Neutron diffraction measurements have been performed to determine the full residual stress tensor along the expected crack path in an austenitic stainless steel (Esshete 1250) compact tension weld specimen. A destructive slitting method was then implemented on the same specimen to measure the stress intensity factor profile associated with the residual stress field as a function of crack length. Finally deformations of the cut surfaces were measured to determine a contour map of the residual stresses in the specimen prior to the cut. The distributions of transverse residual stress measured by the three techniques are in close agreement. A peak tensile stress in excess of 600 MPa was found to be associated with an electron beam weld used to attach an extension piece to the test sample, which had been extracted from a pipe manual metal arc butt weld. The neutron diffraction measurements show that exceptionally high residual stress triaxiality is present at crack depths likely to be used for creep crack growth testing and where a peak stress intensity factor of 35 MPa√m was measured (crack depth of 21 mm). The neutron diffraction measurements identified maximum values of shear stress in the order of 50 MPa and showed that the principal stress directions were aligned to within~20°of the specimen orthogonal axes. Furthermore it was confirmed that measurement of strains by neutron diffraction in just the three specimen orthogonal directions would have been sufficient to provide a reasonably accurate characterisation of the stress state in welded CT specimens.

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“…Additional cuts can be made to find other stress components, in which case the overall procedure resembles the sectioning method [39][40][41]. The slitting method can also be used to estimate the stress intensity factor caused by residual stresses, which is very useful for fatigue and fracture studies [42].…”

Section: Specimen Shapes and Materials Removal Geometrymentioning

confidence: 99%

Relaxation Methods for Measuring Residual Stresses: Techniques and Opportunities

Schajer

2010

Exp Mech

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Relaxation methods, also called "destructive" methods, are commonly used to evaluate residual stresses in a wide range of engineering components. While seemingly less attractive than non-destructive methods because of the specimen damage they cause, the relaxation methods are very frequently the preferred choice because of their versatility and reliability. Many different methods and variations of methods have been developed to suit various specimen geometries and measurement objectives. Previously, only specimens with simple geometries could be handled, but now the availability of sophisticated computational tools and of high-precision machining and measurement processes has greatly expanded the scope of the relaxation methods for residual stress evaluation. This paper reviews several prominent relaxation methods, describes recent advances, and indicates some promising directions for future developments.

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Experimental determination of stress intensity factors due to residual stresses

Cited by 82 publications

References 11 publications

Methods of measuring residual stresses in components

Methods of measuring residual stresses in components

Measurement of the Residual Stress Tensor in a Compact Tension Weld Specimen

Relaxation Methods for Measuring Residual Stresses: Techniques and Opportunities

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