DEM/FEM simulation of the shot peening process on sharp notches

Published on Aug 15, 2021in International Journal of Mechanical Sciences4.631
· DOI :10.1016/J.IJMECSCI.2021.106547
Abstract null null The residual stress field produced by shot peening on Al-7075-T651 prismatic samples carrying V-edge notches is evaluated through combined Discrete Element Modeling (DEM) and Finite Element Modeling (FEM) simulations. Special care is paid to faithfully model the interaction between peening nozzle, shots and notched target through DEM analyses and to understand the coverage level at the notch root. The simulated stream of shots with randomly distributed size, location and velocity is imported into an explicit dynamic FE model of a neighborhood of the notch tip. The resulting residual stress (RS) field is compared to the RS field computed using thermal fields in a FEM simulation, calibrated with experimental data collected through Micro-hole Drilling, Micro-slot Cutting and Micro-X-ray Diffraction techniques. The obtained results are in good agreement with experimentally reconstructed RS and suggests the hypothesis that the notch tip RS field is dictated only by impacts occurring in the very vicinity of the notch apex.
In last decades, many alleviation measures were proposed in order to improve the life of fretting fatigue affected components. The aim of such palliatives is that to counteract the high stress gradients that arise near the contact surface. In such a context, the shot peening treatment is worth noting. Therefore, in the present paper, the fatigue life of shot-peened aluminium and titanium alloy specimens, subject to fretting fatigue under partial slip regime, is assessed by means of the Carpinter...
3 CitationsSource
#1Matteo Benedetti (University of Trento)H-Index: 22
#2Filippo Berto (NTNU: Norwegian University of Science and Technology)H-Index: 68
Last. Vigilio Fontanari (University of Trento)H-Index: 23
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Abstract The Strain Energy Density (SED) based fatigue criterion proposed in Benedetti et al. Int. J. Fatigue 2020;133:105397 is further developed to incorporate residual stresses (RS). Mechanical and residual stresses are treated separately. The formers are encapsulated in the form of SED associated to stress range and maximum SED. The work done when tensile mechanical strains fluctuate in the presence of compressive RS is added to the equivalent SED of the fatigue criterion. This is calibrated...
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#1Michal JamborH-Index: 7
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The severe shot peening process was applied to the notched specimens from an AW 7075 alloy with the aim to improve fatigue endurance in the very-high cycle fatigue region. To reveal the stress state in the notch vicinity, finite element analysis was performed, simulating the conditions of the used 20 kHz ultrasonic fatigue loading. Modified surface characteristics by the severe shot peening process were analyzed in terms of residual stress distribution measured by X-ray diffraction methods and n...
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#1Shun Yang (THU: Tsinghua University)H-Index: 3
#1Shun Yang (THU: Tsinghua University)H-Index: 1
Last. Jishen YangH-Index: 1
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Abstract In this paper, the stress relaxation behavior and fatigue performance of SS304 materials treated with three shot peening intensities (0.1 mmA, 0.25 mmA and 0.4 mmA) were studied and a life prediction model was proposed. The model can describe the stress relaxation process and fatigue failure process of shot peening specimens completely combined with the surface morphology of the specimens treated with different shot peening intensities. The predicted fatigue lives of three kinds of shot...
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#1Liang Tan (NPU: Northwestern Polytechnical University)H-Index: 7
#2Changfeng Yao (NPU: Northwestern Polytechnical University)H-Index: 14
Last. Zhang Jiyin (NPU: Northwestern Polytechnical University)H-Index: 5
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#1Magnus Kahlin (Linköping University)H-Index: 3
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Abstract A major challenge for additively manufactured structural parts is the low fatigue strength connected to rough as-built surfaces. In this study, Ti6Al4V manufactured with laser powder bed fusion (L-PBF) and electron beam powder bed fusion (E-PBF) have been subjected to five surface processing methods, shot peening, laser shock peening, centrifugal finishing, laser polishing and linishing, in order to increase the fatigue strength. Shot peened and centrifugal finished L-PBF material achie...
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#1M. Marini (University of Trento)H-Index: 3
#2F. Piona (University of Trento)H-Index: 1
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Abstract Shot peening (SP) is used to enhance the fatigue life of metallic components. The knowledge of the resulting residual stress (RS) field in the vicinity of geometrical features working as stress raisers is essential to fully integrate SP into the design stage, but is of very difficult achievement, both from a numerical and experimental standpoint. Finite elements (FE) proved to be a powerful tool for tuning the SP process and predicting the RSs, and Discrete element (DE) simulations can ...
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#1Karl Jakob Winkler (TUM: Technische Universität München)H-Index: 1
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This paper contains data of the research project FVA 293 III by Schurer et al. and investigates the tooth root bending strength and the fatigue fracture characteristics of case-carburized and shot-peened gears of different sizes. The investigated carburized and shot-peened gears are made out of high-purity steel batches of the materials 20MnCr5 and 18CrNiMo7-6. Three different gear sizes with the normal modules mn = 1.5, 5, and 10 mm are examined in pulsator test rigs. Additionally, gear running...
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#1T. Klotz (École Polytechnique de Montréal)H-Index: 5
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Abstract Shot peening on part edges is a critical operation in aerospace manufacturing. Edges are plastically deformed by the shot peening media, which can create stress concentration features known as “rolled edges”. The detrimental impact of rolled edges on fatigue life has already been observed in the literature. However, the effects of the geometries of the unpeened edges on rolled edge formation and on the resulting fatigue life have never been published in the open literature. This study p...
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