Effect of Residual Stress on Crack Growth Specimens Fabricated From Weld Metal

Kerr, Matthew; Dunn, Darrell S.; Olsen, Mitchell D.; Alexandreanu, B.; Hill, Michael R.; Willis, Eric

doi:10.1115/pvp2011-57693

Cited by 3 publications

(2 citation statements)

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“…The potential significance of cutting plasticity on the accuracy of the slitting stresses was assessed using the recently published approach of Prime [12] which uses SIF data to estimate a percentage error in apparent measured stress knowing the material yield stress. The stress error is estimated to be about 15 % for a yield stress of 241 MPa (parent material 0.2 % proof stress) and 2 % for a yield stress of 430 MPa (work hardened yield stress in the region of the electron beam weld implied by the neutron diffraction measurements).…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

“…Residual stresses remaining in CT samples extracted from large weldments have been studied in various materials [10][11][12][13][14]. In particular, Davies et al [10] measured residual stresses up to three times the yield strength of the parent material by neutron diffraction in a CT specimen containing a manual metal arc weld.…”

Section: Introductionmentioning

confidence: 99%