The significance of prior overload on fracture resistance: A critical review

Smith, David J.; Garwood, S.J.

doi:10.1016/0308-0161(90)90120-7

Cited by 35 publications

(12 citation statements)

References 23 publications

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“…There is also some evidence that exposure to low frequency alternating magnetic fields can cause a levelling of the dislocation distributions and thus aid stress relief (Wu et al 2003). It is indisputable that significant local or global plastic straining under external loading can be effective at relaxing residual stress (Sauer 1964, Burdekin 1969, Smith and Garwood 1990, Prime and Hill 2002. This is because the plastic strains typically introduced by such treatments are much larger than the initial eigenstrains (∼tenths of a per cent) associated with residual stresses and so largely control the final stress state.…”

Section: Pre-stretching/stress Levelling and Shakedownmentioning

confidence: 99%

“…transient retarded crack growth (figure 31) (Wheeler 1972, Garwood andBoulton 1979). This effect is exploited in the use of warm pre-stressing to increase fracture toughness of cracked components (Smith and Garwood 1990). High spatial resolution x-ray diffraction measurements have been used to study the state of stress in the vicinity of a fatigue crack tip under plane stress (Croft et al 2005.…”

Section: Fatigue and Thermal Fatiguementioning

confidence: 99%

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Residual stress and its role in failure

2007

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Our safety, comfort and peace of mind are heavily dependent upon our capability to prevent, predict or postpone the failure of components and structures on the basis of sound physical principles. While the external loadings acting on a material or component are clearly important, There are other contributory factors including unfavourable materials microstructure, preexisting defects and residual stresses. Residual stresses can add to, or subtract from, the applied stresses and so when unexpected failure occurs it is often because residual stresses have combined critically with the applied stresses, or because together with the presence of undetected defects they have dangerously lowered the applied stress at which failure will occur. Consequently it is important that the origins of residual stress are understood, opportunities for removing harmful or introducing beneficial residual stresses recognized, their evolution in-service predicted, their influence on failure processes understood and safe structural integrity assessments made, so as to either remove the part prior to failure, or to take corrective action to extend life. This paper reviews the progress in these aspects in the light of the basic failure mechanisms.

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Section: Pre-stretching/stress Levelling and Shakedownmentioning

confidence: 99%

Section: Fatigue and Thermal Fatiguementioning

confidence: 99%

Residual stress and its role in failure

2007

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“…In particular, they exhibit a ductile-to-brittle fracture mode transition from high-temperature micro-void coalescence to low-temperature quasi-cleavage [2]. It is well known that the load bearing capacity of a component with a stress concentrator can be strongly affected (increased or decreased) if a residual stress field is introduced near the stress concentrator: this technique is called warm prestressing WPS [3]. While a great deal of studies on WPS have been done on reactor pressure vessel steel in the brittle regime, there is practically no investigations on WPS published as far as the reduced activation tempered martensitic steels are concerned.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Residual Stresses around the Notch of Tensile Specimens of the High-Cr Tempered Martensitic Steel F82H-Mod

Ilchuk¹,

Spätig²,

Davydov³

et al. 2013

KEM

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Abstract. Residual elastic strains were measured by neutron diffraction using POLDI materials science diffractometer at PSI-Switzerland on pre-loaded notched flat tensile specimens made of the high-chromium tempered martensitic steel F82H-mod steel. To calculate the residual stresses using Hooke's equation, three perpendicular components of the residual strain field were determined. The measured residual strains and stresses were compared with those deduced from finite element simulation calculations. A very good agreement was found for the strains in the loading plane of the specimen while a somewhat larger discrepancy was observed for the out-of-plane residual strain, which was tentatively attributed to an uncertainty in the initial lattice spacing in that direction.

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“…The practice of proof testing a component prior to and during service is well established and has also been applied to bridges, penstocks, and pipelines. It is also known that such proof testing can reduce the risk of subsequent fracture when cracks are present in a component (2). The tensile overstressing and unloading are known to produce a zone of compressive residual stress around the crack tip as a result of local plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of residual stress distributions in previously loaded cracked beams

Smith

Bourke

Hodgson

et al. 1992

The Journal of Strain Analysis for Engineering Design

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The measurement and prediction of residual stress distributions in a fatigue pre-cracked and a plastically overloaded A533B steel beam are described. The residual stresses were obtained experimentally using the neutron diffraction technique. Finite element analysis was employed to predict the elastic-plastic response and residual stresses introduced after overloading. Comparison of the experimental results have been made with the finite element predictions (for both plane stress and strain conditions) averaged over the same sampling volume used to make the neutron diffraction measurements. It has been found that good agreement is achieved away from the near crack tip region. However, close to the crack tip the measured compressive residual stresses are significantly smaller than predicted. This difference is attributed to the A533B steel exhibiting a Bauschinger effect and yielding at a lower stress after a stress reversal.

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The significance of prior overload on fracture resistance: A critical review

Cited by 35 publications

References 23 publications

Residual stress and its role in failure

Residual stress and its role in failure

Measurement of Residual Stresses around the Notch of Tensile Specimens of the High-Cr Tempered Martensitic Steel F82H-Mod

Interpretation of residual stress distributions in previously loaded cracked beams

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