Elementary Models for Frequency-Independent Internal Friction

2021 ◽  
pp. 94-117
Author(s):  
A.I. Tseitlin ◽  
A.A. Kusainov
Keyword(s):  
Internal Friction ◽  
Frequency Independent

On: “Frequency‐independent background internal friction in heterogeneous solids” by Baxter H. Armstrong (GEOPHYSICS, June 1980, p. 1042–1054).

Geophysics ◽  
1981 ◽  
Vol 46 (9) ◽  
pp. 1314-1314 ◽  
Author(s):  
Gábor Korvin
Keyword(s):  
Internal Friction ◽  
Frequency Dependence ◽  
Attenuation Coefficient ◽  
Thermal Conduction ◽  
Heterogeneous Solids ◽  
Low Frequencies ◽  
Novel Approach ◽  
Frequency Independent ◽  
Inherent Frequency

In his recent paper Dr. Armstrong proposes a novel approach based on considerations of thermal conduction and thermoelastic dissipation to explain the observed nearly constant Q behavior toward low frequencies in randomly heterogeneous solids. I feel, however, the fluctuation coefficient R defined by his equation (22) does have an inherent frequency dependence introduced through the [Formula: see text] factors so that the attenuation coefficient A might be a more complicated function of frequency than suggested by equation (24).

DYNAMIC CALCULATION OF PRISMATIC SYSTEMS TAKING INTO ACCOUNT INTERNAL FRICTION

2017 ◽  
Vol 7 (3) ◽  
pp. 24-27
Author(s):  
Elena S. VRONSKAYA
Keyword(s):  
Internal Friction ◽  
Composite Structures ◽  
Separation Of Variables ◽  
Erential Equation ◽  
Dynamic Problems ◽  
Dynamic Calculation ◽  
Calculation Algorithm ◽  
Distributed Parameters ◽  
Frequency Independent ◽  
Design Resistance

The paper shows a possibility of including a frequency-independent viscoelastic design resistance in calculation models representing composite structures with distributed parameters. Diff erential equations of the system motion include parameters of complex rigidity. The research puts forward a solution which helps solve stationary and non-stationary dynamic problems taking internal friction into account. This solution is found by using the calculation algorithm for prismatic shells involving the use of topological matrices. In the process of separation of variables, this approach yields a diff erential equation of linear oscillator motion with frequency-independent viscoelastic resistance.

Internal friction in a martensitic high-carbon steel

2001 ◽  
Vol 81 (12) ◽  
pp. 2797-2808
Author(s):  
Rustem Bagramov, Daniele Mari, Willy Benoi
Keyword(s):  
Carbon Steel ◽  
Internal Friction ◽  
High Carbon Steel ◽  
High Carbon

A simple system to measure internal friction and creep

1992 ◽  
Vol 2 (9) ◽  
pp. 1779-1786
Author(s):  
A. M. Bastawros ◽  
M. Z. Said
Keyword(s):  
Internal Friction ◽  
Simple System

Internal friction and some other properties of shape memory Fe-Mn-Si based alloys

2003 ◽  
Vol 112 ◽  
pp. 397-400 ◽  
Author(s):  
P. G. Yakovenko ◽  
O. Söderberg ◽  
K. Ullakko ◽  
V. K. Lindroos
Keyword(s):  
Internal Friction ◽  
Shape Memory

LOW TEMPERATURE INTERNAL FRICTION OF COLD WORKED ZIRCONIUM

1971 ◽  
Vol 32 (C2) ◽  
pp. C2-209-C2-213 ◽  
Author(s):  
E. J. SAVINO ◽  
E. A. BISOGNI
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Cold Worked

INTERNAL FRICTION IN RHENIUM

1971 ◽  
Vol 32 (C2) ◽  
pp. C2-179-C2-181
Author(s):  
M. RAADSCHELDERS ◽  
R. DE BATIST
Keyword(s):  
Internal Friction
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