Improvement in Fatigue Limit By Shot Peening for High-strength Steel Containing Crack-like Surface Defect (Influence of Surface Crack Aspect Ratio)

NAKAGAWA, Makiko; Takahashi, Koji; Osada, Toshio; Okada, Hideki; Koike, Hitonobu

doi:10.5346/trbane.2014.13

Cited by 14 publications

(22 citation statements)

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“…It is surprising that the fatigue limit of the pre-crack + SP specimens with a ≅ 35 or 50 µm were close to that of the smooth specimen. Similar results have been reported for metals; [6][7][8][9]12 however, this is the first report with regard to ceramics.…”

Section: Surface Texture After Shot Peeningsupporting

confidence: 88%

“…If the fatigue test result of a pre-crack + SP specimen meets either one of the following two conditions, the pre-crack is considered to be rendered harmless by shot peening. 8,9 Condition (a): The fatigue limit increased to more than 95% of that of the smooth + SP specimen.…”

Section: Experimental Evaluation Of the Pre-crack Size Rendered Harmlmentioning

confidence: 99%

“…The main purpose of shot peening is to increase the fatigue strength and prevent the stress corrosion cracking of metals. It has been reported that shot peening on the steels containing cracklike surface defects improves the fatigue limit by increasing the acceptable defect size, in spring steels, [6][7][8][9] low-alloy steels 10 and carbon steels. 11,12 In other words, the surface defects are rendered harmless by shot peening, from the viewpoint of the fatigue limit.…”

Section: Introductionmentioning

confidence: 99%

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Increased fatigue strength of partially stabilised zirconia achieved by shot peening

Takahashi

Iwanaka

Koike

2017

Materials Science and Technology

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The effects of shot peening (SP) on the fatigue strength of partially stabilised zirconia were studied. Smooth specimens and specimens containing a surface pre-crack with depths in the range 35–110 μm were subjected to SP. The cyclic fatigue tests were performed using a three-point bending setup. SP introduced compressive residual stresses on the specimens and improved their fatigue strengths. The shot peened specimens with pre-crack depths ≤ 50 μm fractured outside the pre-crack area and exhibited considerably high fatigue limits, equivalent to those of the shot peened smooth specimens. Therefore, the pre-cracks with depths ≤ 50 μm could be rendered harmless by SP, which was confirmed by the theoretical estimations based on fracture mechanics.

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Section: Surface Texture After Shot Peeningsupporting

confidence: 88%

Section: Experimental Evaluation Of the Pre-crack Size Rendered Harmlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Increased fatigue strength of partially stabilised zirconia achieved by shot peening

Takahashi

Iwanaka

Koike

2017

Materials Science and Technology

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“…Recently, many papers examining the fatigue fracture behavior of peened crack materials have been published. [15][16][17][18][19][20] Typical examples of the experimental results are shown in Figures 1-3. 15 The material is spring steel of HV470, and the width (2W ) and thickness (t ) of the specimen are 10mm and 3mm, respectively.…”

Section: Wmmentioning

confidence: 99%

Proposal for a New Threshold Stress Intensity Factor Range Equation for Fatigue Crack Propagation and a Study on the Analysis of Peculiar Fracture Behavior of Shot Peened Materials by its Application

Nam

ANDO

Kim

2020

Preprint

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An equation of the threshold stress intensity factor range was proposed for the fatigue crack growth using a nonlinear region of unique fatigue fracture. The following phenomena, peculiar to the peening specimen with a pre-crack, were analyzed using previous experiment results based on the proposed equation. As a result, the following to phenomena could be evaluated quantitatively whereas was evaluated qualitatively. Pre-crack size that can be rendered harmless by peening; Fatigue limit of pre-crack specimen that cannot be rendered harmless; A phenomenon that fatigue fracture appears from outside the pre-cracked part on most of the harmless pre-crack specimen; Non-propagating crack condition of stage II (tensile type), observed in most specimen showing fatigue limit; and Qualitative analysis for initiation of non-propagating stage II crack (tensile type) in the peening specimen based on the reference regarding to a micro distribution of residual stress due to peening.

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“…between the stress intensity factor and the crack size based on the acting stress and compressive residual stress (Nakagawa et al, 2014;Ando et al, 2021;Nam et al, 2021). Each stress intensity factor is evaluated using the Newman-Raju equation (Newman and Raju, 1981) and API-RP579's equation (American Petroleum Institute, API, 2000).…”

mentioning

confidence: 99%

Reliability Improvement of Offshore Structural Steel F690 Using Surface Crack Nondamaging Technology

Lee¹,

Kim

et al. 2021

J. Ocean Eng. Technol.

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Offshore construction generally refers to the installation of structures and facilities in the marine environment for the production and transportation of electricity, petroleum, gas, and other resources.The shipbuilding industry is growing globally owing to the increasing freight volume, and drilling rigs are also actively being constructed for the development of marine resources (Lee et al., 2011;Song et al., 2013;Kim and Kim, 2018). High-strength steels are used to construct these offshore structures as they are becoming increasingly large and the environments in which they are used are becoming increasingly harsh. However, the possibility of microcracks developing in high-strength steels is high in harsh environments (variable load action), and cracks that have formed can grow rapidly. Microcracks can develop when processing materials and when transporting and installing these structures. To ensure the safety and reliability of offshore structures, initial defects that lead to microcracking should be rendered harmless.Recently, many researchers have been actively attempting to render cracks harmless using peening. Peening effectively induces a compressive residual stress in high-strength steel (Al-Hassani, 1982;Al-Obaid, 1990;Harada et al., 2007) and increases its fatigue life and strength (Lee and Kim, 1997;Benedetti et al., 2002). As the heat-affected zone of welds is prone to cracking, studies have been conducted on improving fatigue life and rendering cracks harmless by peening the weld toe (Houjou et al., 2013a;Fueki et al., 2015;. Furthermore, studies simulating the behavior of steels with existing microcracks have been conducted to investigate the use of peening to render cracks harmless (Takahashi et al., 2012;Houjou et al., 2013b). A crack is determined to be harmless using the relationship

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Improvement in Fatigue Limit By Shot Peening for High-strength Steel Containing Crack-like Surface Defect (Influence of Surface Crack Aspect Ratio)

Cited by 14 publications

References 0 publications

Increased fatigue strength of partially stabilised zirconia achieved by shot peening

Increased fatigue strength of partially stabilised zirconia achieved by shot peening

Proposal for a New Threshold Stress Intensity Factor Range Equation for Fatigue Crack Propagation and a Study on the Analysis of Peculiar Fracture Behavior of Shot Peened Materials by its Application

Reliability Improvement of Offshore Structural Steel F690 Using Surface Crack Nondamaging Technology

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