Temperature variation of modulus of rigidity and internal friction: An experiment with torsional oscillator

1985 ◽  
Vol 53 (12) ◽  
pp. 1192-1195
Author(s):  
Gauri Shanker ◽  
V. K. Gupta ◽  
B. Saraf ◽  
N. K. Sharma
Keyword(s):  
Internal Friction ◽  
Temperature Variation ◽  
Torsional Oscillator

scholarly journals Thermal Variation of Elastic Modulus on Nanocrystalline NiCuZn Ferrites

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
S. R. Murthy
Keyword(s):  
Particle Size ◽  
Internal Friction ◽  
Curie Temperature ◽  
Temperature Variation ◽  
Room Temperature ◽  
Elastic Moduli ◽  
Anisotropy Constant ◽  
Initial Permeability ◽  
Elastic Behaviour ◽  
Thermal Variation

The nanopowders of Ni0.38Cu0.12Zn0.5Fe2O4 with particle size, 20 nm have been synthesised using Microwave-Hydrothermal method and characterized. Then the ferrite samples were microwave sintered at different temperatures in an air atmosphere and characterized. The magnetic properties were measured at room temperature. The dielectric constant (ɛ), initial permeability (μi) and quality factor (Q) has been measured on sintered samples at 1 MHz. Thermal variation of initial permeability has been measured over temperature range of 300 K–600 K. A detailed study of elastic behaviour of NiCuZn ferrites has been under taken using a composite piezoelectric oscillator method over a temperature of 300 K–600 K. The room temperature elastic moduli is found to be slightly sample dependent and decreases with increasing the temperature, except near the Curie temperature, TC, where a small anomaly is observed. The internal friction at room temperature is also found to be more particle size dependent. The temperature variation of internal friction exhibits a broad maximum around 500 K, just below Curie temperature TC 530 K. The above observations were carried on in the demagnetized state; on the application of a 400 mT magnetic field allowed us to reach the saturated state of the sample at any of the measuring temperature. The anomaly observed in the thermal variation of elastic moduli and internal friction is explained with the help of temperature variation of magneto-crystalline anisotropy constant.

Torsional oscillator for internal friction data at 100 kHz

1989 ◽  
Vol 60 (8) ◽  
pp. 2706-2710 ◽  
Author(s):  
David G. Cahill ◽  
J. E. Van Cleve
Keyword(s):  
Internal Friction ◽  
Torsional Oscillator

scholarly journals Nanocrystalline Pb(Zr0.52Ti0.48)O3Ferroelectric Ceramics: Mechanical and Electrical Properties

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
M. Venkata Ramana ◽  
M. Penchal Reddy ◽  
N. Ramamanohar Reddy ◽  
K. V. Siva Kumar ◽  
V. R. K. Murthy ◽  
...  
Keyword(s):  
Internal Friction ◽  
Temperature Variation ◽  
Perovskite Phase ◽  
Structural Phase ◽  
High Energy ◽  
Nanocrystalline Powders ◽  
Polaron Hopping ◽  
Sharp Stress ◽  
Friction Measurements ◽  
Longitudinal Modulus

Nanocrystalline powders of the composition were obtained by Mechanical alloying (high-energy ball milling). X-ray diffraction studies show that these compounds are completely into the perovskite phase. Detailed studies of electrical and mechanical properties of PZT as a function of temperature (and frequency) showed the high permittivity of 20653 at Curie transition temperature. Temperature variation of longitudinal modulus and internal friction of these ceramics at 104 kHz frequency were studied in the wide temperature range of C–C. The internal friction measurements showed sharp stress induced relaxation peaks in the present composition corresponding to those temperatures where the minima were noticed in temperature variation of longitudinal modulus behavior. This dielectric and internal friction behaviour was explained in the light of polaron hopping mechanism and structural phase transitions in the present piezoelectric compositions.

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
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