Fatigue crack initiation and propagation on shot-peened surfaces in A316 stainless steel

Rios, E. R. de los; Walley, A.; Milan, Marcelo; Hammersley, G.

doi:10.1016/0142-1123(95)00044-t

Cited by 160 publications

(99 citation statements)

References 2 publications

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“…While hammer and shotpeening of welds have long been practiced, similar treatments such as needle, ultrasonic and laser shock peening are becoming more widespread [90,91]. As in many other applications, peening is used to improve the fatigue life of welded joints, since the compressive residual stresses which it introduces inhibit fatigue crack propagation from the material's surface [92,93,94]. Impact indentations can also smooth imperfections in the shape of the weld toe (see Figure 8), reducing stress concentrations and hence further increasing fatigue life [95].…”

Section: Peeningmentioning

confidence: 99%

Contemporary approaches to reducing weld induced residual stress

Coules

2013

Materials Science and Technology

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractSelf-equilibrating residual stresses may occur in materials in the absence of external loading due to internal strain inhomogeneity. While favourable distributions of residual stress can bestow an object with the appearance of superior material properties, most welding processes leave behind residual stresses in particularly unfavourable patterns, causing a greater susceptibility to fracture-based failure mechanisms and unintended deformation. Currently, heat treatment is the primary means of removing these stresses, but since the formation of residual stress is dependent upon many material and process factors, there are several other viable mechanisms (using thermal, mechanical or phase transformation effects) by which it may be modified. It is only now, using relevant advances in numerical and experimental methods, that these techniques are being fully explored. This article gives a brief introduction to weld-induced residual stresses and reviews the current state-of-the-art with regard to their reduction. Emphasis is placed on the recent development of unconventional techniques, and the mechanisms by which they act.

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Section: Peeningmentioning

confidence: 99%

Contemporary approaches to reducing weld induced residual stress

Coules

2013

Materials Science and Technology

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“…It is well known 4,5) that fatigue cracking normally initiates at the surface, and cracks will not initiate or propagate in a compressively stressed zone and the extent of mitigation depends strongly upon the residual stress magnitude and distribution. The maximum compressive residual stress produced at or under the surface of a part by SP treatment is at least as great as half the yield strength of the material being peened.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Relaxation of Shot Peened Deformation Surface Layer on S30432 Austenite Steel under Applied Loading

Zhan

Jiang

2012

Mater. Trans.

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The relaxation of residual stress in shot peened surface layer on S30432 austenite steel under static and cyclic loading was investigated. The results revealed that the compressive residual stresses were relaxed under applied tensile stress. The relaxation of residual stresses in longitudinal direction was more obvious than that in transverse direction. And when applied stress was beyond the yield strength of the materials, the relaxation of the compressive residual stress was drastic. Under cyclic loading, the results showed that the relaxation behavior was determined by the applied loading and the number of cycles. And the fast relaxation of the compressive residual stress took place in the first few cycles then became stable gradually. Finally, a model was used to quantitatively predict the compressive residual stress under cyclic loading with different applied tensile stresses.

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“…The beneficial effect of shot peening is a result of coupling of the residual stresses and strain hardening [7] although the relative beneficial contributions of each are still controversial [13]. It has been reported that the beneficial effect of strain hardening is in increasing the initiation life since high dislocation densities in the cold worked region result in higher yield stresses [7,14] and thus lower plastic strain amplitudes under stress controlled cycling [15];…”

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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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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Fatigue crack initiation and propagation on shot-peened surfaces in A316 stainless steel

Cited by 160 publications

References 2 publications

Contemporary approaches to reducing weld induced residual stress

Contemporary approaches to reducing weld induced residual stress

Residual Stress Relaxation of Shot Peened Deformation Surface Layer on S30432 Austenite Steel under Applied Loading

The effect of shot peening on notched low cycle fatigue

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