scholarly journals The Application of Acoustic Method for the Determination of Uniaxial Mechanical Stress Profile

2016 ◽  
Vol 0 (6) ◽  
pp. 101-106
Author(s):  
Григорій Семенович Тимчик ◽  
Марина В'ячеславівна Філіппова ◽  
Марія Олександрівна Демченко
Keyword(s):  
Mechanical Stress ◽  
Acoustic Method ◽  
Stress Profile

Research of the Wood’s Alloy Crystallization Process Using the Acoustic Method

2021 ◽  
Vol 410 ◽  
pp. 855-861
Author(s):  
Aleksandr Yu. Yaroslavkin ◽  
Eugene A. Tyurin ◽  
Darya A. Melnikova
Keyword(s):  
Speed Of Sound ◽  
Crystallization Process ◽  
Ultrasonic Method ◽  
Single Pulse ◽  
Acoustic Method ◽  
The State ◽  
Sound Signal ◽  
Frequency Range ◽  
Wood’S Alloy

The article examines the process of crystallization of Wood alloy using the ultrasonic method. The dependence of the determination of the speed of sound in three aggregate states of the alloy (liquid, solid, transition (liquid-solid)) was derived. The relation-ship with the amplitude values of the sound signal, a single pulse in determining the speed of sound, as well as in determining the state of the alloy is carried out. The data obtained allow us to analyze the state of the alloy and the measurement time and the specified frequency range directly in the process of crystallization.

The Estimation of Long-Range Internal Stress Fields by Spectral-Acoustic Method

2014 ◽  
Vol 1013 ◽  
pp. 121-126 ◽  
Author(s):  
Aleksandr Smirnov ◽  
Nikolai Ababkov ◽  
Aleksandra Glinka
Keyword(s):  
Conceptual Model ◽  
Physical And Mechanical Properties ◽  
Acoustic Method ◽  
Electron Microscopic ◽  
Limiting State ◽  
Acoustic Characteristics ◽  
Complex Criterion ◽  
Microscopic Studies ◽  
Hazardous Production

A conceptual model consisting of diagrams, text and terminology dictionary, made in a formalized way and representations of functions, each of which reflects the real state of the long-running metal at all stages of the life cycle. Based on the developed conceptual model, analysis of the results of electron microscopic studies measuring the acoustic characteristics and determination of physical and mechanical properties of the complex criterion limiting state long working metal technical devices hazardous production facilities.

Residual Stresses and Differential Deformation of Electroplated Structures

1989 ◽  
Vol 33 ◽  
pp. 161-169
Author(s):  
G. Sheikh ◽  
I. C. Noyan
Keyword(s):  
Residual Stresses ◽  
Lattice Parameter ◽  
Stress Profile ◽  
X Ray ◽  
Residual Stress Profile ◽  
Cyclic Loading And Unloading ◽  
Nickel Substrates ◽  
Loading And Unloading

AbstractWe report the results of a recent study where nickel substrates electroplated with chromium were loaded in-situ on an x-ray diffractometer. This technique allows determination of lattice spacings in the vicinity of the interface for both the film and the substrate as a function of the applied load. We used such lattice parameter data, SEM observations of the surface and x-ray peak breadth data to study the partitioning of deformation between the film and the substrate. The data indicates progressive loss of adhesion between the film and the substrate with increasing deformation. We observe significant effect of electroplating residual stresses on the mechanical behavior of the system. The loss of adhesion between the film and the substrate coupled with the initial residual stress profile causes an apparent 'negative Poisson's ratio' for the film during initial stages of the loading. This effect disappears with cyclic loading and unloading.

Calculation of Optical Characteristics for Si1-xGExAlloy

1995 ◽  
Vol 379 ◽  
Author(s):  
V. G. Litovchenkoe ◽  
S. I. Frolov ◽  
B. N. Shkarban ◽  
D. Kruger
Keyword(s):  
Crystal Lattice ◽  
Mechanical Stress ◽  
Measurement Technique ◽  
Lattice Strain ◽  
Uniaxial Stress ◽  
Material Composition ◽  
Optical Transitions ◽  
Virtual Crystal Approximation ◽  
Pseudopotential Theory

ABSTRACTIn the framework of virtual crystal approximation using the empirical pseudopotential theory optical transitions of Si1 -xGexhave been calculated. The effects of hydrostatic and uniaxial stress, and alloy stoichiometry on the optical gaps were investigated. Since the mechanical stress and material composition affect the distinctive behaviour of different optical transitions it allows to put forward a spectral measurement technique for determination of crystal lattice strain and alloy parameter x simultaneously.

scholarly journals Acoustic Method for Determination of the Thermal Properties of Nanofluids

2019 ◽  
Vol 58 (42) ◽  
pp. 19719-19731
Author(s):  
Bashar Mahmoud ◽  
Hugh P. Rice ◽  
Lee Mortimer ◽  
Michael Fairweather ◽  
Jeffrey Peakall ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Acoustic Method
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