Application of the Eigenstrain Theory to Predict Residual Stress around Curved Edges after Laser Shock Peening

Coratella, Stefano; Toparli, M. Burak; Fitzpatrick, Michael E.

doi:10.4028/www.scientific.net/msf.768-769.185

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…b, which shows a 25–30% underestimation of σ xx in the T0 notched sample by directly using the equi‐biaxial eigenstrain profiles determined from the T0 plain sample. Other examples showing unsatisfactory modelling results using similar assumptions can be found in .…”

Section: Numerical Modelling and Discussionmentioning

confidence: 81%

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

You

Achintha

Soady³

et al. 2016

Fatigue Fract Eng Mat Struct

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In this study, the residual stress relaxation behaviour occurring during low-cycle fatigue in shot-peened specimens with either a flat or a notched geometry has been studied. A representative low-pressure steam turbine material, FV448, was used. The residual stress and strain hardening profiles caused by shot peening were measured experimentally and were then incorporated into a finite element model. By allowing for both effects of shot peening, the residual stress relaxation behaviour was successfully simulated using this model and correlated well with the experimental data. Although more modelling work may be required to simulate the interaction between shot peening effects and external loads in a range of notched geometries, the model predictions are consistent with the specimens tested in the current study. The novelty of this study lies in the development of such a modelling approach which can be used to effectively simulate the complex interaction between shot peening effects and external loads in notched regions. Compared with the un-notched geometry, the notched geometry was found to be more effective in retaining the improvement in fatigue life resulting from shot peening, by restricting the compressive residual stress relaxation during fatigue loading.

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Section: Numerical Modelling and Discussionmentioning

confidence: 81%

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

You

Achintha

Soady³

et al. 2016

Fatigue Fract Eng Mat Struct

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show abstract

“…Because of the environment in which it works, corrosion, erosion and cracks initiation are things to consider in the structural design. According to (Coratella: 2014), aircrafts are designed to withstand maximum load since the invention of the aviation industry in 1903. Cracks are due to imperfection of materials used in the design of airplanes.…”

Section: Introductionmentioning

confidence: 99%

Variation in the Mechanical properties of Extruded Al-2099 after laser shock peening

Jige¹,

Teryima²,

Malgwi³

et al. 2018

IJSRP

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Laser shock peening (LSP) is an industrial process which creates rapid pressure rise in material surfaces giving rise to shock waves by using a high energy laser pulse. It offers 10 times increased life time as compared to the traditional mechanical shot peening. In other to understand how strengthening precipitates are distributed in aluminum 2099 after been treated with Laser Shock Peening (LSP), hardness test was applied to an axially extruded T-shape of Al-2099. The result obtained from the hardness test showed variation in the hardness values of specimens extracted at different sections of the T shaped Al 2099. The initial average hardness value of the flange was 140Hv while that of the web was 130 Hv. That was before laser shock peening was applied. After the application of laser shock peening, the initial softer part (Web) showed a higher value of hardness value of up to 170 Hv. The flange which was initially harder than the web before laser shock peening showed a hardness increment value of up to 160Hv. By implication, it means the softer web developed more residual stress meaning better response to laser shock peening. The findings also showed that Al 2099 extruded T shaped exhibit different crystallographic textures at differing locations within the extruded cross section. This was reflected in the hardness variation. There was evidence of fibrous texture in the web and rolling texture in the flange. Inhomogeneous texture showed influence on mechanical properties such as hardness value. An average depth of laser shock penetration based on the peened condition for Al 2099 was recorded at 2 mm from the surface in to the material. Approximately 18 % and 21 % increment in maximum surface hardness was recorded for the flange and web specimens respectively after treating them with Laser shock peening. Hence, the users of software's solvers such as finite element analysis and eigen strain analysis for modelling should bear in mind the assumption of such geometry as continuum and assumption of homogeneous material properties and assumption of homogeneous material properties.

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Rekonstruktion von Eigenspannungstiefenverläufen aus Messungen von Maß- und Formänderungen und oberflächennahen Eigenspannungen

Frerichs

Lübben

Zoch

2016

HTM Journal of Heat Treatment and Materials

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KurzfassungEigenspannungen spielen bei der Bewertung der Güte von Bauteilen eine große Rolle. Der Aufwand für die Messungen der Eigenspannungen, insbesondere von Eigenspannungstiefenverläufen, ist aber oft sehr groß. So müssen z. B. bei röntgenografischen Methoden sukzessive oberflächennahe Schichten aufwendig abgetragen werden. Bei Tiefen größer als ca. 1 mm muss oftmals sogar mit thermischen Neutronen oder Synchrotronstrahlung gearbeitet werden. Aus diesem Grund sind einfachere Verfahren, mit denen man auf die Spannungstiefenverläufe schließen kann, von großem Nutzen. In diesem Zusammenhang können Dehnungsmessungen bzw. Messungen von Maß und Formänderungen eine Hilfe sein. Ursachen für Verzüge sind nicht elastische Dehnungen, die durch z. B. Drehen, Schleifen, Wärmebehandlungen etc. verursacht werden. Sind am Ende des Prozesses die nicht elastischen Dehnungen asymmetrisch im Werkstück verteilt, führen sie zu charakteristischen Eigenspannungsverteilungen und Maß- und Formänderungen. Dieser Beitrag betrachtet Eigenspannungstiefenverläufe, die beim Schleifen und induktivem Erwärmen generiert werden. Im Falle von rechteckig geformten Prismen mit geringer Dicke und im Vergleich großer Länge, die nur von einer Seite bearbeitet werden, sind die Hauptverzugseffekte Biegung und Längenänderung. Diese einfach zu messenden Werte können sehr hilfreich sein, um auf die nicht elastischen Dehnungen und damit auf die korrelierenden elastischen Dehnungen bzw. Eigenspannungen 1. Art innerhalb des Werkstücks zu schließen. Da die genannten Werte sich gegenseitig beeinflussen, stellt sich die Frage, inwieweit man den Aufwand bei der Messung von Eigenspannungen durch eine Kombination von Verzugs- und röntgenografischen Messungen optimieren kann. Welche und wie viele Eigenspannungsmessungen sind notwendig, um Eigenspannungstiefenverläufe in Bereichen tiefer als 1 mm unterhalb der Oberfläche des Werkstücks abschätzen zu können?

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Application of the Eigenstrain Theory to Predict Residual Stress around Curved Edges after Laser Shock Peening

Cited by 3 publications

References 10 publications

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

Variation in the Mechanical properties of Extruded Al-2099 after laser shock peening

Rekonstruktion von Eigenspannungstiefenverläufen aus Messungen von Maß- und Formänderungen und oberflächennahen Eigenspannungen

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