Incorporation of residual stresses into the SINTAP defect assessment procedure

Stacey, A.; Barthelemy, J. Y.; Leggatt, R.H.; Ainsworth, R.A.

doi:10.1016/s0013-7944(00)00075-8

Cited by 58 publications

(39 citation statements)

References 10 publications

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“…6 that indeed some relaxation of the radial strain field occurs within the first 4 mm, resulting in a redistribution of strain magnitude along the depth in the chord wall thickness. However, this conclusion cannot be extended to transverse and longitudinal strains even if this shakedown effect is often encountered for highcycle fatigue with high stress range [9]. The magnitude of any relaxation in these directions remains to be confirmed.…”

Section: Shakedown Effectmentioning

confidence: 89%

“…This is mainly because of the longer beam path length, leading to poorer counting statistics (lower peak to background ratio). (Table 3) in the area around the weld toe (350e420 MPa for a depth between 2 and 3 mm) and are greater than longitudinal ones, which is not the case for tubular butt welds [9]. Moreover, this particular orientation of the largest residual stresses is also the orientation of the externally applied stresses, as a consequence they will superimpose in a detrimental way.…”

Section: Residual Stresses Mapsmentioning

confidence: 92%

“…In 2000, an extensive review of biaxial residual stress data in tubular joints was made by Stacey [9] on pipe-to-plate joints, tubular T-joints and Y-joints. This showed that mean longitudinal residual stresses (stresses parallel to the weld direction) never exceeded the material yield stress by more than 20 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Neutron diffraction investigations on residual stresses contributing to the fatigue crack growth in ferritic steel tubular bridges

Acevedo

Evans

Nussbaumer

2012

International Journal of Pressure Vessels and Piping

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a b s t r a c tFatigue crack growth observed in tubular K-joint specimens, typical of tubular bridge structures, always initiates at the chord crown toe locations whether the applied stress range is tensile or compressive. Even though other locations around the weld have highest hot-spot stresses, chord crown toe locations are still the most critical. This raises the question about the relevant tensile residual stress level at that location. The results of residual stress investigations, obtained using neutron diffraction measurements highlight that the direction and location of the maximum tensile residual stresses in K-joints is substantially different from those in the more usual tubular butt joints. Indeed, it is shown that the highest tensile residual stresses are oriented perpendicular to the weld direction, which is also the main orientation of the loading stresses applied in K-joints. This paper demonstrates that it is the complex geometry of the K-joint that causes the superposition of critical stresses, making these joints susceptible to fatigue cracking. Therefore, transverse residual stresses play a crucial part in the fatigue crack growth behaviour that applied stresses alone cannot explain.

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Section: Shakedown Effectmentioning

confidence: 89%

Section: Residual Stresses Mapsmentioning

confidence: 92%

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Neutron diffraction investigations on residual stresses contributing to the fatigue crack growth in ferritic steel tubular bridges

Acevedo

Evans

Nussbaumer

2012

International Journal of Pressure Vessels and Piping

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“…In the model, the uncertainties in the residual stress distributions due to the welding and post-weld treatment processes, σ weld (b) and σ pwt (b), are represented by two statistical variables, VAR weld and VAR pwt , which are assigned attributes based on stress measurements reported in [18,23,24].…”

Section: Probabilistic Lefm-based Modelmentioning

confidence: 99%

“…This distribution is based on measurements made on welded tubular joint specimens [23,24]. The assumed post-weld treatment residual stress distribution is:…”

Section: Probabilistic Lefm-based Modelmentioning

confidence: 99%

A probabilistic assessment of the effect of post-weld treatment on the fatigue performance of tubular truss bridges

Walbridge

Nussbaumer

2008

Engineering Structures

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In the design of tubular truss bridges, engineers have found the fatigue performance of the joints to be a critical aspect. In looking for ways to improve this performance, the use of residual stress-based post-weld treatments has been suggested. Although these treatments have been shown to increase the average fatigue lives of welded details under constant amplitude loading conditions in a number of studies, concerns exist regarding their reliability, in particular under realistic, variable amplitude loading conditions. With this in mind, the effect of post-weld treatment on the fatigue performance of tubular truss bridges is assessed herein using a previously developed probabilistic, fracture mechanics-based model, modified to analyze entire bridge structures under realistic, variable amplitude loading conditions. This model uses a systems reliability approach to consider the influences of the various potential crack sites on the overall reliability of the bridge. By analyzing several variants of a typical tubular truss bridge, it is shown that post-weld treatment can result in a significant fatigue performance improvement for this bridge type. This improvement is quantified herein in terms of either a savings in steel weight or an increase in fatigue life. Several additional studies examine the sensitivity of the results of this assessment to variations in the treatment coverage, intensity, and uniformity. These studies show that similar results can be obtained with a partial treatment strategy to those observed when the entire bridge is treated, and that the treatment benefit depends more on the intensity than the uniformity of the treatment.

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References

2023

Welded High Strength Steel Structures

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Incorporation of residual stresses into the SINTAP defect assessment procedure

Cited by 58 publications

References 10 publications

Neutron diffraction investigations on residual stresses contributing to the fatigue crack growth in ferritic steel tubular bridges

Neutron diffraction investigations on residual stresses contributing to the fatigue crack growth in ferritic steel tubular bridges

A probabilistic assessment of the effect of post-weld treatment on the fatigue performance of tubular truss bridges

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