Investigation of residual stress relaxation under cyclic load

Zhuang, Wyman; Halford, Gary R.

doi:10.1016/s0142-1123(01)00132-3

Cited by 360 publications

(189 citation statements)

References 8 publications

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“…This effect is enhanced by the Bauschinger effect which reduces the compressive yield strength after initial tensile cold work (which was required to generate the compressive residual stresses). Analytical models incorporating the Bauschinger effect have been developed for this relaxation [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The degree of relaxation is heavily dependent on the component geometry, specific loading mechanism (the applied cyclic stress distribution) and material characteristics of a particular shot peened system (for example yield strength, cyclic softening characteristics and the modification of these by the intense cold work in the near surface layer [17]). …”

Section: Introductionmentioning

confidence: 99%

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The effect of shot peening on notched low cycle fatigue

Soady

Mellor

Shackleton

et al. 2011

Materials Science and Engineering: A

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The improvement in low cycle fatigue life created by shot peening ferritic heat resistant steel was investigated in components of varying geometries based on those found in conventional power station steam turbine blades. It was found that the shape of the component did not affect the efficacy of the shot peening process, which was found to be beneficial even under the high stress amplitude three point bend loads applied. Furthermore, by varying the shot peening process parameters and considering fatigue life it has been shown that the three surface effects of shot peening; roughening, strain hardening and the generation of a compressive residual stress field must be included in remnant life models as physically separate entities. The compressive residual stress field during plane bending low cycle fatigue has been experimentally determined using X-ray diffraction at varying life fractions and found to be retained in a direction parallel to that of loading and to only relax to 80% of its original magnitude in a direction orthogonal to loading. This result, which contributes to the retention of fatigue life improvement in low cycle fatigue conditions, has been discussed in light of the specific stress distribution applied to the components. The ultimate aim of the research is to apply these results in a life assessment methodology which can be used to justify a reduction in the length of scheduled plant overhauls. This will result in significant cost savings for the generating utility. KeywordsLow cycle fatigue, stress concentration, shot peening, residual stresses, ferritic heat resisting

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of shot peening on notched low cycle fatigue

Soady

Mellor

Shackleton

et al. 2011

Materials Science and Engineering: A

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“…Some work has reported that shot peening stresses relax rapidly during fatigue cycling [7,8], whilst work on residual stresses in FSW butt welds in a work hardening aluminium alloy has indicated that their magnitude may increase during fatigue cycling [1]. This is an important issues in life prediction for shot peened components.…”

Section: Introductionmentioning

confidence: 99%

Residual stresses and fatigue performance

James

Hughes²,

Chen³

et al. 2007

Engineering Failure Analysis

176

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Residual stresses are an inescapable consequence of manufacturing and fabrication processes, with magnitudes that are often a high proportion of the yield or proof strength. Despite this, their incorporation into life prediction is primarily handled through sweeping assumptions or conservative application of statistics. This can lead to highly conservative fatigue design methodologies or unforeseen failures under dynamic loading. The push from the desire for higher levels of materials performance, coupled with the pull of more sophisticated techniques for residual stress measurement, favours a reassessment of the accuracy of assumptions made about residual stresses and the modification during fatigue cycling. A viewpoint is also emerging that the fatigue performance of welded joints might be optimised through careful process control, coupled with understanding of the relative positions of, and interaction between, residual stress peaks, weld defects, hardness and microstructure. This paper will present information regarding the residual stress profiles in aluminium and steel welds obtained via synchrotron and neutron diffraction at the ESRF/ILL in Grenoble. Specimens were then subjected to specific cases of fatigue loading and the residual stress field was again measured. Difficulties associated with determining the strain-free lattice spacing will be mentioned, and the import of these data for life prediction modelling will be considered.

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“…1. Typically, shot peening produces compressive residual stress to depths of between 100 and 500 µm accompanied by high levels of cold work (15-40%) [8]. In UIT, a high-frequency acoustic force (20-30 kHz) is applied, often by means of a portable tool, to the surface in order to introduce beneficial compressive stresses [4,9].…”

mentioning

confidence: 99%

Engineering the residual stress state and microstructure of stainless steel with mechanical surface treatments

et al. 2010

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Four mechanical surface treatments have been considered for the application to austenitic stainless steel structures. Shot peening (SP), laser shock peening (LSP), ultrasonic impact treatment (UIT) and water jet cavitation peening (WJCP), also known as cavitation shotless peening (CSP), have been applied to 8 mm thick Type 304 austenitic stainless steel coupons. This study considers the merits of each of these mechanical surface treatments in terms of their effect on the surface roughness, microstructure, level of plastic work and through thickness residual stress distribution. Microstructural studies have revealed the formation of martensite close to the treated surface for each process. Residual stress measurements in the samples show compressive stresses to a significantly greater depth for the LSP, UIT and WJCP samples compared to the more conventional SP treated sample.

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Investigation of residual stress relaxation under cyclic load

Cited by 360 publications

References 8 publications

The effect of shot peening on notched low cycle fatigue

The effect of shot peening on notched low cycle fatigue

Residual stresses and fatigue performance

Engineering the residual stress state and microstructure of stainless steel with mechanical surface treatments

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