High-Temperature Mechanical Spectrometer for Internal Friction Measurements

2009 ◽  
Vol 423 ◽  
pp. 89-95 ◽  
Author(s):  
P. Simas ◽  
José San Juan ◽  
Robert Schaller ◽  
M.L. Nó
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Internal Friction ◽  
Torsion Pendulum ◽  
Dynamic Shear ◽  
Shear Elastic Modulus ◽  
Computer Controlled ◽  
Friction Measurements ◽  
Structural Intermetallic ◽  
Different Parts

A new high temperature mechanical spectrometer, based on an inverted torsion pendulum, has been constructed for the measurement of the internal friction and the dynamic shear elastic modulus in two different working modes: (a) as a function of temperature (300 – 1800 K) at imposed frequency, during heating or cooling; and (b) as a function of frequency (10-3 – 10 Hz) in isothermal conditions. The whole installation is computer controlled by a dedicated software specifically developed. We describe the different parts of this new installation, as well as its performances in both temperature and frequency through an original example study on a high temperature structural intermetallic of Fe-Al.

High-Temperature Isothermal Internal Friction Measurements in NiCoCrAlY Alloys

M ◽  
2009 ◽  
pp. 447-447-10
Author(s):  
P Gadaud ◽  
A Rivière ◽  
J Woirgard
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Friction Measurements

Comparison of Test Methods for High-Temperature Performance of Asphalt Mixtures

2013 ◽  
Vol 361-363 ◽  
pp. 1629-1634 ◽  
Author(s):  
Guo Xiong Wu ◽  
Xiao Ke Zhang ◽  
Rui Lin Wang
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Shear Test ◽  
Asphalt Mixture ◽  
Test Methods ◽  
Asphalt Mixtures ◽  
Penetration Test ◽  
Shear Elastic Modulus ◽  
Temperature Performance ◽  
Slant Shear

Through a comparative study of high-temperature asphalt mixture performance by three methods: the standard rutting test, uniaxial penetration test on cylindrical specimens, and slant shear test, this paper displays that the shear elastic modulus gained by both cylindrical uniaxial penetration test and slant shear test can reflect well the properties of shear deformation of asphalt mixture under high temperature. However, there are certain limitations in these test methods.

Investigation of High Temperature Elastic Modulus and Internal Friction of SOFC Electrolytes Using Resonance Method

2019 ◽  
Vol 25 (2) ◽  
pp. 1673-1677 ◽  
Author(s):  
Takuto Kushi ◽  
Kazuhisa Sato ◽  
Atsushi Unemoto ◽  
Koji Amezawa ◽  
Tatsuya Kawada
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Internal Friction ◽  
Resonance Method ◽  
Sofc Electrolytes

S0305-3-2 Investigation of Elastic Modulus and Internal Friction of SOFC Electrolytes at High Temperature Using Resonance Method

2009 ◽  
Vol 2009.1 (0) ◽  
pp. 235-236
Author(s):  
Takuto KUSHI ◽  
Kazuhisa SATO ◽  
Atsushi UNEMOTO ◽  
Koji AMEZAWA ◽  
Tatsuya KAWADA
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Internal Friction ◽  
Resonance Method ◽  
Sofc Electrolytes

scholarly journals Effects of Precipitation Hardedning in Co-Ni-Cr Alloy on Dissipative Motion of Dislocations by Amplitude-Dependent Internal Friction Measurements / Wpływ Utwardzenia Wydzieleniowego Stopu Co-Ni-Cr Na Rozpraszający Ruch Dyslokacji Badany Przez Zależne Od Amplitudy Pomiary Tarcia Wewnętrznego

2015 ◽  
Vol 60 (4) ◽  
pp. 3077-3082 ◽  
Author(s):  
R. Cosimati ◽  
Daniele Mari
Keyword(s):  
Elastic Modulus ◽  
Internal Friction ◽  
Thermoelectric Power ◽  
Phenomenological Model ◽  
Precipitation Hardening ◽  
Thermal Cycles ◽  
Mechanical Spectroscopy ◽  
Threshold Strain ◽  
Hardness Increase ◽  
Friction Measurements

The effects of precipitation hardening occurring in a Co-Ni-Cr alloy after annealing treatments have been studied by using mechanical spectroscopy. The amplitude-dependent internal friction (ADIF) due to the dissipative motion of dislocations reveals the presence of a threshold strain for weakly pinned dislocations. The change of ADIF curves and the increase of the elastic modulus after thermal cycles producing precipitates suggest that dislocations motion is hindered leading to increasing strength of the material. Precipitation is confirmed by the changes of thermoelectric power (TEP) and by hardness measurements showing a hardness increase at the same temperature as the maximum in TEP curve. The ADIF spectra as well as the interaction between dislocations and precipitates are interpreted by proposing a phenomenological model based on the Granato-Lücke theory.

Torsion pendulum method to evaluate the internal friction and elastic modulus of films

2003 ◽  
Vol 74 (4) ◽  
pp. 2477-2480 ◽  
Author(s):  
Z. S. Li ◽  
Q. F. Fang ◽  
S. Veprek ◽  
S. Z. Li
Keyword(s):  
Elastic Modulus ◽  
Internal Friction ◽  
Torsion Pendulum

Damping Capacity of Fe-Ga Alloys

2011 ◽  
Vol 228-229 ◽  
pp. 937-941 ◽  
Author(s):  
Fang Mei Ling ◽  
Jie Zhu ◽  
Li Ji Heng ◽  
Gao Xue Xu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Wide Temperature Range ◽  
Room Temperature ◽  
Damping Capacity ◽  
Torsion Pendulum ◽  
Temperature Peak ◽  
Temperature Range ◽  
Computer Controlled ◽  
Increasing Temperature

The damping capacity of Fe-Ga rods and sheets has been studied using a computer-controlled automatic inverted torsion pendulum instruments in a wide temperature range in a series of frequency. The frequency and temperature has different influence on the damping capacity of solidified Fe83Ga17 rods and (Fe83Ga17)97.25Cr2B0.75 sheets. The damping capacity of all specimens increased with frequencies. The solidified Fe-Ga rods showed an obvious low-temperature peak and a potential high-temperature peak with increasing temperature. However, the damping capacity of Fe-Ga sheets kept steady in a wide temperature range and then rapidly increased on further heating above 400°C. Damping capacity of about 0.02 was obtained in both Fe-Ga rods and sheets at temperatures from room temperature to 500°C. Thus, The Fe-Ga alloys are considered to be a class of promising high damping alloys.

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