Measurement of Creep Deformation in Stainless Steel Welded Joints

Sakanashi, Y.; Güngör, S.; Bouchard, P. J.

doi:10.1007/978-1-4614-0228-2_45

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…True elastic-plastic properties of the base metal (BM) and weld material (WM) obtained from tensile tests measured using the digital image correlation (DIC) technique have been reported in Ref [19] and shown in Figure 6. The material properties were employed in elastic-plastic FE analyses.…”

Section: Mechanical and Creep Propertiesmentioning

confidence: 99%

Prediction of Reheat Cracking Behavior in a Service Exposed 316H Steam Header

Zhou

Mehmanparast

Nikbin

2020

J. Multiscale Modelling

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Reheat cracking in an ex-service Type 316H stainless steel steam header component has been investigated in this study. The examined steam header was in service for 87,790[Formula: see text]h and the cracks in this component were found in the vicinity of the weld toe. The root cause of this type of failure was due to the welding residual stresses. The welding-induced residual stresses had been present in the header at the early stage of the operation and were released during service. In this paper, a novel technique has been proposed to simulate the residual stress distribution normal to the crack direction by applying remote fixed displacement boundary conditions in an axisymmetric model. This approach can simulate the presence of residual stresses in actual components without the need to develop full weld simulation to quantify them. The predicted residual stress levels and distributions normal to the crack direction have been found in good agreement with the measured residual stresses available in the literature for a similar header. The creep crack growth (CCG) rates have been characterized using the fracture mechanics [Formula: see text] parameter and estimated using predictive models.

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Section: Mechanical and Creep Propertiesmentioning

confidence: 99%

Prediction of Reheat Cracking Behavior in a Service Exposed 316H Steam Header

Zhou

Mehmanparast

Nikbin

2020

J. Multiscale Modelling

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“…A three-zone furnace was specially manufactured with a porthole through its wall for the purpose of imaging the specimen surface during testing. A temperature survey of this furnace and assembly was performed by Sakanashi [18] using 8 thermocouples. It was found that the temperature was essentially uniform (within ±1°C) along the sample and hence the temperature of the sample's gauge section could be confidently determined by referencing just two thermocouples.…”

Section: Experimental Set-up For Creep and High Temperature Tensile Tmentioning

confidence: 99%

“…The external creep specimen failed in the parent material, and the internal specimen in the 45 o inclined HAZ region. This diagram also marks the failure location of cross-weld tensile tests conducted at room temperature and 545°C, details of which can be found elsewhere [10,18].…”

Section: Cross-weld Creep Deformation Measurementsmentioning

confidence: 99%

“…Recently the present authors have demonstrated the use of a DIC technique for the measurement of strain during uniaxial tensile and time-dependent creep rupture tests at elevated temperatures [9,10]. The present article describes in detail the test set-up for the DIC measurements and the analysis methods developed to measure spatially resolved creep deformation properties in cross-weld samples extracted from multi-pass weldments.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlation

et al. 2016

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Spatially resolved measurement of creep deformation across weldments at high temperature cannot be achieved using standard extensometry approaches. In this investigation, a Digital Image Correlation (DIC) based system has been developed for long-term high-temperature creep strain measurement in order to characterise the material deformation behaviour of separate regions of a multi-pass weld. The optical system was sufficiently stable to allow a sequence of photographs to be taken suitable for DIC analysis of creep specimens tested at a temperature of 545°C for over 2000 h. The images were analysed to produce local creep deformation curves from two cross-weld samples cut from contrasting regions of a multi-pass V-groove weld joining thick-section AISI Type 316H austenitic stainless steel. It is shown that for this weld, the root pass is the weakest region of the structure in creep, most likely due to the large number of thermal cycles it has experienced during the fabrication process. The DIC based measurement method offers improved spatial resolution over conventional methods and greatly reduces the amount of material required for creep characterisation of weldments.

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“…These are specifically, and not limited to, CFAs, pixel lenses, anti-aliasing filters, and a viewfinder mirror mechanism. However, for long term testing where a camera is in place for months [9,10], the cheaper colour cameras may still be an attractive proposition. With the additional resolution of these cameras, there are other situations in which they may preferable to the monochrome scientific cameras, such as crack detection.…”

Section: Introductionmentioning

confidence: 99%

Demosaicing images from colour cameras for digital image correlation

Forsey

Güngör

2016

Optics and Lasers in Engineering

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Digital Image Correlation is not the intended use for consumer colour cameras, but with care they can be successfully employed in such a role. The main obstacle is the sparsely sampled colour data caused by the use of a colour filter array (CFA) to separate the colour channels. It is shown that the method used to convert consumer camera raw files into a monochrome image suitable for digital image correlation (DIC) can have a significant effect on the DIC output. A number of widely available software packages and two in-house methods are evaluated in terms of their performance when used with DIC. Using an in-plane rotating disc to produce a highly constrained displacement field, it was found that the bicubic spline based in-house demosaicing method outperformed the other methods in terms of accuracy and aliasing suppression.

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Measurement of Creep Deformation in Stainless Steel Welded Joints

Cited by 4 publications

References 8 publications

Prediction of Reheat Cracking Behavior in a Service Exposed 316H Steam Header

Prediction of Reheat Cracking Behavior in a Service Exposed 316H Steam Header

Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlation

Demosaicing images from colour cameras for digital image correlation

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