On the nature of acoustic emission and internal friction during cyclic deformation of metals

2014 ◽  
Vol 70 ◽  
pp. 8-18 ◽  
Author(s):  
A. Vinogradov ◽  
I.S. Yasnikov
Keyword(s):  
Acoustic Emission ◽  
Internal Friction ◽  
Cyclic Deformation

Correlation between Acoustic Emission and Internal Friction in Materials

2006 ◽  
Vol 13-14 ◽  
pp. 313-322 ◽  
Author(s):  
Alexei Vinogradov
Keyword(s):  
Acoustic Emission ◽  
Stress Relaxation ◽  
Internal Friction ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Strain Accumulation ◽  
Strain Fracture ◽  
The Difference ◽  
The Relationship ◽  
Good Agreement

The relationship between acoustic emission and internal friction is investigated during cyclic deformation of copper single- and poly-crystals at intermediate amplitudes. Good agreement between these two phenomena has been demonstrated in all materials tested as long as the stress relaxation occurs uniformly within the sample whereas the difference between them becomes pronounced when strain/fracture localisation takes place. The similarity between acoustic emission and internal friction can be extended to materials deforming without appreciable plastic deformation, such as metal matrix composites where the main source of stress relaxation and strain accumulation is the particle breakage. The significance of the relation between internal friction and acoustic emission for understanding of fundamentals of AE is discussed.

Internal friction in α- iron after cyclic deformation

1983 ◽  
Vol 17 (5) ◽  
pp. 581-585 ◽  
Author(s):  
S. Zajωc ◽  
J. Pietrzyk
Keyword(s):  
Internal Friction ◽  
Cyclic Deformation

Cyclic deformation of a magnesium alloy investigated by the acoustic emission technique

2004 ◽  
Vol 378 (1-2) ◽  
pp. 202-206 ◽  
Author(s):  
Torbjørn T. Lamark ◽  
František Chmelı́k ◽  
Yuri Estrin ◽  
Pavel Lukáč
Keyword(s):  
Acoustic Emission ◽  
Magnesium Alloy ◽  
Cyclic Deformation ◽  
Acoustic Emission Technique

scholarly journals Накопление повреждений при статическом деформировании твердого тела регулярного строения: микротрещины, неотрелаксированные напряжения

2020 ◽  
Vol 46 (23) ◽  
pp. 51
Author(s):  
А.М. Лексовский ◽  
Б.Л. Баскин ◽  
Г.Н. Губанова ◽  
В.Е. Юдин
Keyword(s):  
Acoustic Emission ◽  
Internal Friction ◽  
Elastic Deformation ◽  
Metastable State ◽  
Equilibrium Composition ◽  
Nonlinear Mechanism ◽  
Microcrack Formation ◽  
Heterogeneous Solid

Abstract: Using the methods of acoustic emission in the variant of linear location and internal friction, it is shown that when an initially equilibrium composition of the CFRP type is stretched, unrelaxed stresses accumulate in the places of intense microcrack formation. This is due to the incomplete completeness of the relaxation redistribution of the accumulated energy / elastic deformation by a nonlinear mechanism. The increasing level of unrelaxed stresses inevitably transforms the heterogeneous solid into a metastable state. As a result, the dissipative capacity of the system as a whole is reduced and the probability of a nonequilibrium crack appears.

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