Optimizing the Process Parameters and Investigating the Influence of Shot Peening and Roller Burnishing On Surface Layer Properties and Fatigue Performance of Al 6061 T4

2016 ◽  
Vol 1 (1) ◽  
pp. 65-68
Author(s):  
Othman Ahmed Othman Mohamed ◽  
Lothar Wagne
Keyword(s):  
Surface Layer ◽  
Process Parameters ◽  
Shot Peening ◽  
Fatigue Performance ◽  
Al 6061 ◽  
Roller Burnishing

Influence of Mechanical Surface Treatments on the Fatigue Performance of the Gamma TiAl Alloy Ti-45Al-9Nb-0.2C

2007 ◽  
Vol 539-543 ◽  
pp. 1553-1558 ◽  
Author(s):  
Janny Lindemann ◽  
Anja Kutzsche ◽  
Michael Oehring ◽  
Fritz Appel
Keyword(s):  
Surface Roughness ◽  
Shot Peening ◽  
Tial Alloy ◽  
Elevated Temperatures ◽  
Lower Surface ◽  
Fatigue Performance ◽  
Ambient Temperatures ◽  
Roller Burnishing ◽  
Compressive Stresses ◽  
Wide Range

The effect of shot peening and roller burnishing on the fatigue performance of the γ(TiAl) alloy Ti-45Al-9Nb-0.2C was investigated over a wide range of processing intensities. At optimized conditions shot peening and roller burnishing can markedly improve the fatigue strength at ambient temperatures. For temperatures above 650 °C, the residual compressive stresses induced by shot peening and roller burnishing quickly relax. This indicates that, at elevated temperatures, surface roughness and dislocation strengthening become more important for the fatigue performance of mechanically surface-treated components. Roller burnishing leads to much lower surface roughness than shot peening, resulting in more effective improvement of high temperature fatigue performance. However, surface strengthening by shot peening can also be beneficial for the fatigue performance at elevated temperatures, when the surface roughness is reduced by subsequent polishing.

Robust Design for Fatigue Performance: Shot Peening

1996 ◽  
Author(s):  
Marcos Esterman ◽  
Ivan M. Nevarez ◽  
Kosuke Ishii ◽  
Drew V. Nelson
Keyword(s):  
Fatigue Life ◽  
Surface Treatment ◽  
Robust Design ◽  
Process Parameters ◽  
Material Properties ◽  
Shot Peening ◽  
Fatigue Performance ◽  
Quality Characteristic ◽  
Design Parameters ◽  
Line Production

Abstract Fatigue data usually display substantial scatter. The goal of this paper is to demonstrate how simulated variation in surface treatment processing parameters and material properties affect the predicted fatigue life (mean and scatter) of a component. This is achieved by applying robust design principles to fatigue life evaluation methods, using shot peening as the representative manufacturing process for this study. Analyzing changes in the appropriate fatigue performance quality characteristic due to variations in the process parameters and material properties will identify levels of the controllable process parameters which maximize the mean fatigue performance and minimize its scatter. The simulation predictions of this study are consistent with past experimental observations which show that compressive residual stress distributions tend to increase mean fatigue life and reduce its scatter for a component. Our results extend these observations by relating the increase in mean life and the reduction in scatter to the controllable manufacturing and design parameters. In addition, the intermediate measure of compressive zone depth is identified as a possible off-line production quality check that relates directly to the component fatigue performance (mean and scatter), as well as an aid to the designer to identify an appropriate surface treatment process. This study serves as an initial step in the development of a generalized methodology that can aid engineers with design for robust fatigue performance for other manufacturing processes.

scholarly journals A FEM-Based 2D Model for Simulation and Qualitative Assessment of Shot-Peening Processes

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2784
Author(s):  
Georgios Maliaris ◽  
Christos Gakias ◽  
Michail Malikoutsakis ◽  
Georgios Savaidis
Keyword(s):  
Process Parameters ◽  
Material Properties ◽  
Shot Peening ◽  
Qualitative Assessment ◽  
Experimental Investigations ◽  
Elastoplastic Material ◽  
Size Distributions ◽  
User Friendly ◽  
The Impact ◽  
2D Model

Shot peening is one of the most favored surface treatment processes mostly applied on large-scale engineering components to enhance their fatigue performance. Due to the stochastic nature and the mutual interactions of process parameters and the partially contradictory effects caused on the component’s surface (increase in residual stress, work-hardening, and increase in roughness), there is demand for capable and user-friendly simulation models to support the responsible engineers in developing optimal shot-peening processes. The present paper contains a user-friendly Finite Element Method-based 2D model covering all major process parameters. Its novelty and scientific breakthrough lie in its capability to consider various size distributions and elastoplastic material properties of the shots. Therewith, the model is capable to provide insight into the influence of every individual process parameter and their interactions. Despite certain restrictions arising from its 2D nature, the model can be accurately applied for qualitative or comparative studies and processes’ assessments to select the most promising one(s) for the further experimental investigations. The model is applied to a high-strength steel grade used for automotive leaf springs considering real shot size distributions. The results reveal that the increase in shot velocity and the impact angle increase the extent of the residual stresses but also the surface roughness. The usage of elastoplastic material properties for the shots has been proved crucial to obtain physically reasonable results regarding the component’s behavior.

Improvement in Fatigue Performance of 2024-T3 Al Alloy Via Single Toroidal Roller Burnishing

2021 ◽  
Vol 30 (3) ◽  
pp. 2256-2266
Author(s):  
G. V. Duncheva ◽  
J. T. Maximov ◽  
V. P. Dunchev ◽  
A. P. Anchev ◽  
T. P. Atanasov
Keyword(s):  
Fatigue Performance ◽  
Al Alloy ◽  
Roller Burnishing

Elasto-plastic pseudo-dynamic numerical model for the design of shot peening process parameters

2009 ◽  
Vol 30 (8) ◽  
pp. 3112-3120 ◽  
Author(s):  
Rajiv Shivpuri ◽  
Xiaomin Cheng ◽  
Yongning Mao
Keyword(s):  
Numerical Model ◽  
Process Parameters ◽  
Shot Peening

Surface Modification Analysis after Shot Peening of AA 7075 in Different States

2013 ◽  
Vol 768-769 ◽  
pp. 519-525 ◽  
Author(s):  
Sebastjan Žagar ◽  
Janez Grum
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Shot Peening ◽  
Fatigue Testing ◽  
Stress Profile ◽  
Treatment Conditions ◽  
Stress Profiles ◽  
Compressive Residual Stresses

The paper deals with the effect of different shot peening (SP) treatment conditions on the ENAW 7075-T651 aluminium alloy. Suitable residual stress profile increases the applicability and life cycle of mechanical parts, treated by shot peening. The objective of the research was to establish the optimal parameters of the shot peening treatment of the aluminium alloy in different precipitation hardened states with regard to residual stress profiles in dynamic loading. Main deformations and main residual stresses were calculated on the basis of electrical resistance. The resulting residual stress profiles reveal that stresses throughout the thin surface layer of all shot peened specimens are of compressive nature. The differences can be observed in the depth of shot peening and the profile of compressive residual stresses. Under all treatment conditions, the obtained maximum value of compressive residual stress ranges between -200 MPa and -300 MPa at a depth between 250 μm and 300 μm. Comparison of different temperature-hardened aluminium alloys shows that changes in the Almen intensity values have greater effect than coverage in the depth and profile of compressive residual stresses. Positive stress ratio of R=0.1 was selected. Wöhler curves were determined in the areas of maximum bending loads between 30 - 65 % of material's tensile strength, measured at thinner cross-sections of individual specimens. The results of material fatigue testing differ from the level of shot peening on the surface layer.

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