Effect of the confinement on the properties of ultrasonic vibrated granular gases

Badreddine, Jawad; Micoulaut, Matthieu; Rouhaud, Emmanuelle; Remy, Sébastien; Retraint, Delphine; François, Manuel

doi:10.1007/s10035-013-0397-9

Cited by 7 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The vibration amplitude influences the normal speed of the impacts. In this case, doubling of the vibration amplitude doubles the velocity of the steel balls which leads to their approximately four-time higher kinetic energy [ 36 ]. After SMAT, the plate was cut into smaller samples 10 mm × 10 mm in size.…”

Section: Methodsmentioning

confidence: 99%

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment in Grade 2 Titanium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

et al. 2021

View full text Add to dashboard Cite

Microstructural changes in grade 2 titanium generated by surface mechanical attrition treatment (SMAT) were studied using positron annihilation lifetime spectroscopy and complementary methods. A significant increase in the mean positron lifetime indicated many lattice defects introduced by SMAT. Two positron lifetime components were resolved in the positron lifetime spectra measured. The longer lifetime revealed the presence of vacancy clusters containing about 3 or 4 vacancies, while the shorter one was attributed to the annihilation of positrons trapped at dislocations. The changes of the positron lifetime indicated a decreasing dislocation density and the presence of a deeper layer with a higher concentration of vacancy clusters at the distance from the treated surface for which the microhardness approached the value for the strain-free matrix. Electrochemical impedance spectroscopy showed the positive effect of SMAT on the corrosion resistance of the titanium studied in a saline environment also after removal of the original oxide layer that was formed during the SMAT.

show abstract

Section: Methodsmentioning

confidence: 99%

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment in Grade 2 Titanium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The vibration amplitude controls the normal speed of the impacts. A higher amplitude leads to a higher impact velocity [ 61 ]. In this case, doubling the vibration amplitude will lead to doubling the velocity of the shots, i.e., to approximately factor 4 in the kinetic energy increase.…”

Section: Methodsmentioning

confidence: 99%

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

et al. 2020

View full text Add to dashboard Cite

Surface mechanical attrition treatment (SMAT) was used to generate a gradient microstructure in commercial grade magnesium. Positron annihilation lifetime spectroscopy and variable energy positron beam measurements, as well as microhardness tests, electron backscatter diffraction, X-ray diffraction, and electrochemical corrosion tests, were used to investigate the created subsurface microstructure and its properties. It was found that SMAT causes an increase in dislocation density and grain refinement which results in increased hardness of the subsurface zone. The mean positron lifetime values indicate trapping of positrons in vacancies associated with dislocations and dislocation jogs. The increase of the SMAT duration and the vibration amplitude influences the depth profile of the mean positron lifetime, which reflects the defect concentration profile. Electrochemical measurements revealed that the structure induced by SMAT increases the susceptibility of magnesium to anodic oxidation, leading to the enhanced formation of hydroxide coverage at the surface and, as a consequence, to the decrease in corrosion current. No significant effect of the treatment on the residual stress was found.

show abstract

“…Based on the experimental results, a physical model describing the behaviour of the shot was given. And a mathematical model was proposed to simulate the behaviour of the shot during the USP by introducing the restitution coefficient [56,58-60]. The results indicate that the proposed calculation model is reasonable to predict the shot velocity during the USP.…”

Section: Modelling Of Kinetics Of a Single Shotmentioning

confidence: 99%

Overview of ultrasonic shot peening

Yin

Rakita

et al. 2017

Surface Engineering

View full text Add to dashboard Cite

Ultrasonic shot peening (USP) is acknowledged as an effective surface treatment method to enhance the mechanical performance of materials by inducing compressive residual stress in solid metals and alloys. This article overviews recent researches from our group at Purdue University on the USP in the aspects of modelling the kinetics of the shots, predicting the surface topography of the peened samples and producing the nanostructured grains on the solid metals and alloys. Research results suggest that finite element method and the developed calculation algorithm can be used for the surface morphology prediction and the USP is capable of surface nanocrystallisation and grain refinement on solid metals. For instance, the topic of the biological enhancement for metallic bio-implant materials via the USP was discussed as well according to our preliminary investigations. The related researches in these topics are discussed and some possible addresses for future study in these fields are drawn and underlined.

show abstract

Effect of the confinement on the properties of ultrasonic vibrated granular gases

Cited by 7 publications

References 27 publications

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment in Grade 2 Titanium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment in Grade 2 Titanium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Overview of ultrasonic shot peening

Contact Info

Product

Resources

About