A comprehensive experimental and numerical study on redistribution of residual stresses by shot peening

Mahmoudi, A.H.; Ghasemi, Ali; Farrahi, G.H.; Sherafatnia, K.

doi:10.1016/j.matdes.2015.10.162

Cited by 86 publications

(32 citation statements)

References 46 publications

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“…The process of the creation of this layer with superior mechanical properties is characterized by three main mechanisms: work-hardening (increase in the dislocation density); introduction of compressive residual stresses; and grain refinement [1,2,4,5,8,[14][15][16][17][18]28].…”

Section: Discussionmentioning

confidence: 99%

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Trško

Fintová

Nový

et al. 2018

Metals

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Shot peening is a well-known surface treatment method used for fatigue life improvement of cyclically loaded structural components. Since three main variables are considered in the peening process (peening intensity, coverage and peening media type), there is no direct way to choose the best combination of treatment parameters for the best performance, thus it has to be based on experience and laboratory tests. When shot peening is performed with inadequate parameters, or the peening process is not stable in time (decrease of the peening pressure, deterioration of the peening media and so on), it can result in significant degradation of the treated component fatigue properties, what is commonly called as the "overpeening" effect. When a premature fatigue fracture occurs in operation, the fracture surface analysis is usually the most important method of revealing the damage mechanism. This work is aimed at the study of the relation between the shot peening parameters and the fatigue fracture surface character on an AW 7075 aluminium alloy with an objective of identifying marks of overpeening and investigating the fatigue crack initiation mechanism. After performing the tests, it was observed that shot peening with optimized parameters creates a surface layer that is able to change the mechanism of the fatigue crack propagation and improve fatigue strength. On the other hand, using extensive peening parameters decrease the fatigue strength due to the creation of surface cracks and surface layer delamination.

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Section: Discussionmentioning

confidence: 99%

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Trško

Fintová

Nový

et al. 2018

Metals

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“…High carbon [3], Ti-6Al-4V [4], and high-strength alloy steel [5] have been shown to transition between surface failure in short-life region and interior failure in long life region and form typical double S-N curves. In the long-life regime, although some factors relating to the fatigue properties of materials have been previously studied, such as load type [6,7], environment [8], defect size [6,9], surface conditions [10,11], and frequency [12], the development of a fatigue strength prediction model has still not been intensively studied.…”

Section: Introductionmentioning

confidence: 99%

Long-Life Fatigue of Carburized 12Cr2Ni Alloy Steel: Evaluation of Failure Characteristic and Prediction of Fatigue Strength

Deng¹,

Liu²,

Liu³

et al. 2018

Metals

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In this study, the fatigue failure behaviors of carburized 12Cr2Ni alloy steel were examined in the long-life regime between 10 4 and 10 8 cycles with about 100 Hz under R = 0. Results showed that this alloy steel exhibited the double S-N characteristics with surface failure and interior failure. From a statistical point of view, the correlation coefficient further proved that the fine granular area (FGA) governed the fatigue performance of carburized 12Cr2Ni alloy steel. Based on the generalized extreme values (GEV) distribution and test data, the predicted maximum defect size was about 23.4 µm. Considering the effect of tensile limit, material hardness, and crack size characteristics, the fatigue strength prediction model under stress ratio of 0 could be established. The predicted fatigue limit for carburized 12Cr2Ni alloy steel at 10 8 cycles under R = 0 was 507.86 MPa, and the prediction error of fatigue limit was within 0.04. Therefore, the results were extremely accurate.

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“…2,3 Many studies were carried out in the past to investigate the effect of shot peening on crack initiation, propagation, and fatigue strength in different materials. 9 Yang et al used finite element simulations to study the effect of the initial surface finish of the target on shot peening effectiveness and found that the initial rough surface leads to a major reduction in the effectiveness of shot peening. 4 In another independent study, Yang et al created a nanostructured surface layer in H13 steel by shot peening and noticed that the hightemperature wear resistance was improved due to peening, and enhanced fatigue crack initiation and propagation behaviour was observed in the nanostructured layer due to compressive residual stresses.…”

Section: Introductionmentioning

confidence: 99%

“…Mahmoudi et al studied the effect of initial compressive residual stress on subsequent compressive residual stress induced by shot peening and found that the initial residual stress was wiped out by shot peening up to the maximum compressive residual stress point. 9 Yang et al used finite element simulations to study the effect of the initial surface finish of the target on shot peening effectiveness and found that the initial rough surface leads to a major reduction in the effectiveness of shot peening. 10 Takahashi et al investigated the effect of shot peening on the torsional fatigue limit in specimens containing artificial defects in highstrength steel specimens and found that the defect with specific dimensions could be rendered harmless by shot peening.…”

Section: Introductionmentioning

confidence: 99%

The influence of partial surface shot peening on fatigue crack growth behaviour of a high‐strength ferritic steel

Al-Turaihi

Mehmanparast

2017

Fatigue Fract Eng Mat Struct

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The effects of partial surface shot peening on the fatigue crack growth behaviour of a ferritic steel have been experimentally investigated in this paper. Dog‐bone specimens fabricated from Optim700QL were tested under tension‐tension fatigue loads. Three distinct extents of partial shot peening, with respect to the crack tip and specimen symmetry line, were tested. The fatigue crack growth results from these experiments have been compared with those obtained from the same specimen geometry but with no peening. The results show that the residual stress fields formed ahead of the initial notch tip due to the partial peening process play a significant role in the fatigue crack growth behaviour of the material and effectively result in accelerated crack propagation at the midwidth of the specimens. It has been shown in this study that partial peening can lead to a fatigue crack growth rate around twice as fast as that of the unpeened specimen.

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A comprehensive experimental and numerical study on redistribution of residual stresses by shot peening

Cited by 86 publications

References 46 publications

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Long-Life Fatigue of Carburized 12Cr2Ni Alloy Steel: Evaluation of Failure Characteristic and Prediction of Fatigue Strength

The influence of partial surface shot peening on fatigue crack growth behaviour of a high‐strength ferritic steel

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