Effect of initial surface finish on effectiveness of shot peening treatment using enhanced periodic cell model

2014 ◽  
Vol 11 (4) ◽  
pp. 463-478 ◽  
Author(s):  
Fan Yang ◽  
Zhuo Chen ◽  
S. A. Meguid
Keyword(s):  
Surface Finish ◽  
Shot Peening ◽  
Cell Model ◽  
Initial Surface ◽  
Periodic Cell ◽  
Periodic Cell Model

scholarly journals Effect of microstructure on dynamic compressive behavior of cellular materials

2021 ◽  
Vol 250 ◽  
pp. 02026
Author(s):  
Kohei Tateyama ◽  
Keiko Watanabe
Keyword(s):  
Numerical Analysis ◽  
Cell Shape ◽  
Cell Model ◽  
Cellular Materials ◽  
Cell Models ◽  
The Finite Element Method ◽  
Analysis Model ◽  
Compressive Properties ◽  
Periodic Cell ◽  
Periodic Cell Model

It is known that the microstructure of cellular materials has a significant impact on their compressive properties. To study these phenomena, a hierarchical Poisson disk sampling algorithm and Voronoi partitioning were used to create a 3D numerical analysis model of cellular materials. In this study, we prepared random, periodic, and ellipsoidal cell models to investigate the effects of cell shape randomness and oblateness. Numerical experiments were performed using the finite element method solver RADIOSS. In the numerical analysis, an object collided with the cellular materials at a velocity of 25 m/s. The results showed that the flow stress of the random cell model was higher than that of the periodic cell model. Further, it was found that the aspect ratio of the cell shape has a significant impact on the mechanical properties of cellular materials.

A new periodic cell model of aerosol diffusion deposition in a fibrous filter

2021 ◽  
Vol 257 ◽  
pp. 117848
Author(s):  
R.F. Mardanov ◽  
S.K. Zaripov ◽  
V.F. Sharafutdinov
Keyword(s):  
Cell Model ◽  
Fibrous Filter ◽  
Periodic Cell ◽  
Periodic Cell Model

Simulation on Residual Stress of Shot Peening Based on a Symmetrical Cell Model

2017 ◽  
Vol 30 (2) ◽  
pp. 344-351 ◽  
Author(s):  
Cheng WANG ◽  
Jiacheng HU ◽  
Zhenbiao GU ◽  
Yangjian XU ◽  
Xiaogui WANG
Keyword(s):  
Residual Stress ◽  
Shot Peening ◽  
Cell Model ◽  
Symmetrical Cell

Surface texture improvement of magnetic and non magnetic materials using magnetic abrasive finishing process

2020 ◽  
pp. 095440622097059
Author(s):  
Kamepalli Anjaneyulu ◽  
Gudipadu Venkatesh
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Surface Texture ◽  
Magnetic Particles ◽  
Supply Voltage ◽  
Initial Surface ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Change In Mean ◽  
Al 2024

The present study focused on surface texture characteristics of magnetic material, Mild steel (MS) as well as nonmagnetic material, Aluminum 2024 (Al 2024) alloy with the application of a laboratory-developed magnetic abrasive finishing (MAF) process. MAF is one of the unconventional finishing processes to attain a satisfactory finishing level up to nanoscale. In MAF, the surface finish is controlled by a flexible magnetic abrasive brush (FMAB) which has a combination of abrasives (Al2O3, SiC, etc.) and magnetic particles (iron powder). The experiments were planned using (L27) full factorial design, different levels of weight percentage of abrasives (20–30%), speed of the electromagnet (180–2100rpm), and electromagnet supply voltage (30–50 V) were varied to enhance the surface responses. The responses considered were % improvements of change in the surface finish (%ΔRa), change in average peak to valley height (%ΔRz), change in total profile height (%ΔRt), and change in mean square root surface finish (%ΔRq). Analysis of variances (ANOVA) was evaluated and discussed. It is observed that the speed of the electromagnet and voltage are the most influencing variable parameters that most impacted on the responses. Surface roughness was measured before and after the MAF processing of MS and Al 2024 using a Suftronic S-100 surface roughness tester. The obtained surface morphology was examined by Scanning Electron Microscopy (SEM). It was observed that MS has %ΔRa = 83, %ΔRz = 65, %ΔRt = 65.5 and %ΔRq = 72.6 while Al 2024 has %ΔRa = 65, %ΔRz =50, %ΔRt = 51 and %ΔRq = 55 with noticeable surface texture improvement compared to the initial surface roughness obtained using surface grinding process.

Effect of Electrolyte on the Surface Smoothness Obtained by Electropolishing of Stainless Steel

2012 ◽  
Vol 713 ◽  
pp. 55-60 ◽  
Author(s):  
M. Hernando ◽  
Pedro Jose Núñez López ◽  
Eustaquio García Plaza ◽  
R. Trujillo
Keyword(s):  
Stainless Steel ◽  
Surface Finish ◽  
Chromic Acid ◽  
Bath Temperature ◽  
Surface Finishing ◽  
Initial Surface ◽  
Surface Finishes ◽  
Finishing Process ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Electropolishing is a surface finishing process of metals and alloys that enhances brilliant surface finishes with low surface roughness values. The most widely used electrolytes for the electropolishing of stainless steel are varying concentrations of phosphoric and sulphuric acid, and occasionally additives such as chromic acid. The objective of this study was to assess the performance of three commonly used industrial electrolytes in terms of the surface finish of electropolished stainless steel AISI 316L. Each electrolyte had varying sulphuric-phosphoric acid combinations with or without chromic acid. The following electropolishing conditions were assessed: current density, bath temperature, electropolishing time, and initial surface texture. The results revealed that adding chromic acid to the electrolyte did not significantly enhance surface finish, and electropolishing ranges were quite similar for all three electrolytes.

Effect of Nitriding Cold Roled and Shot Peening on Automotive Component Fatigue Life

2013 ◽  
Vol 471 ◽  
pp. 324-328
Author(s):  
Nawar A. Kadhim ◽  
N. Nik Abdullah ◽  
S. Abdullah ◽  
A.K. Arrifin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Surface Finish ◽  
Shot Peening ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
The Finite Element Analysis ◽  
Cold Rolled ◽  
Better Than

The finite element modeling and analysis have been performed to investigate the effects of nitriding, cold rolled and shot peening on fatigue life of an automotive lower suspension arm component which fabricated of SAE1045 steel. The finite element analysis (FEA) results indicate a great effect for all surface finish parameters on fatigue life. It shows that nitriding increased the fatigue life of the component better than shot peening, while cold rolled effect was between them. In a nut shell, nitriding can be considered as the best surface treatment to improve the fatigue life of the automotive lower suspension arm which fabricated of SAE1045 steel.

Fretting Fatigue – An Integral Simulation Approach to Strengthening by Shot Peening

2021 ◽  
Author(s):  
Patrick Gerken ◽  
Christoph H. Richter
Keyword(s):  
Shot Peening ◽  
Cell Model ◽  
Fretting Fatigue ◽  
Rotor Blades ◽  
Integral Approach ◽  
Limiting Factor ◽  
Simulation Approach ◽  
Surface Waviness ◽  
Free Surfaces ◽  
Fatigue Endurance

Abstract Fretting fatigue is a limiting factor in blade attachment design for turbomachinery. Shot peening is known to be a strength increasing measure against fatigue. It is applied not only to free surfaces of components under fatigue but also to contacting surfaces subject to fretting fatigue. The present work examines the effect of shot peening on fretting fatigue resistance in fixtures of rotor blades. The chosen integral approach allows the consideration of shot peening and subsequent fretting loading in one simulation. Thus, the residual stresses and material strengthening as well as the surface waviness due to the shot peening process are included in the fretting fatigue simulation. To achieve reasonable computation times a 2D model, calibrated to a 3D unit cell model, is employed. A comparative study on fatigue endurance limits is presented for the cases with and without shot peening. With view to the different failure mechanisms met in these two cases, an initiation evaluation is carried out with the Sines criterion for the un-peened condition; a fracture mechanics approach is shown to be necessary for the evaluation of the shot peened condition.

Fretting Fatigue - An Integral Simulation Approach to Strengthening by Shot Peening

2021 ◽  
Author(s):  
Patrick Gerken ◽  
Christoph H. Richter
Keyword(s):  
Shot Peening ◽  
Cell Model ◽  
Fretting Fatigue ◽  
Rotor Blades ◽  
Integral Approach ◽  
Limiting Factor ◽  
Simulation Approach ◽  
Unit Cell Model ◽  
Free Surfaces ◽  
Fatigue Endurance

Abstract Fretting fatigue is a limiting factor in blade attachment de sign for turbomachinery. Shot peening is known to be a strength increasing measure against fatigue. It is applied not only to free surfaces of components under fatigue but also to contacting surfaces subject to fretting fatigue. The present work examines the effect of shot peening on fretting fatigue resistance in fixtures of rotor blades. The chosen integral approach allows the consideration of shot peening and subsequent fretting loading in one simulation. Thus, the residual stresses and material strengthening as well as the surface wavi ness due to the shot peening process are included in the fretting fatigue simulation. To achieve reasonable computation times a 2D model, calibrated to a 3D unit cell model, is employed. A comparative study on fatigue endurance limits is presented for the cases with and without shot peening. With view to the differ ent failure mechanisms met in these two cases, an initiation eval uation is carried out with the Sines criterion for the un-peened condition; a fracture mechanics approach is shown to be neces sary for the evaluation of the shot peened condition.

Surface Optimisation by Engineering the Stress and Roughness

1996 ◽  
Author(s):  
Peter O’Hara
Keyword(s):  
Fatigue Strength ◽  
Surface Finish ◽  
Shot Peening ◽  
Surface Condition ◽  
Turbine Blades ◽  
Flow Characteristics ◽  
Mean Stress ◽  
Corrosion Pitting ◽  
The Mean ◽  
Damage Tolerant

Performance of turbine components can significantly be affected by surface/subsurface characteristics. Techniques applied today and being developed further entail introducing into a components surface a residual compressive stress of predictable magnitude and depth followed by superfinishing to improve the surface finish. The effect will be to lower the mean stress which will increase component life and fatigue strength or enable higher loads through present designs; develop a damage tolerant layer capable of withstanding corrosion pitting or strike damage while in service and produce a final roughness capable of improving flow characteristics on turbine blades/buckets. The processes to achieve the above include Controlled Shot Peening and Superfinishing. In combination, an optimised surface condition will result.

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