Impulse excitation apparatus to measure resonant frequencies, elastic moduli, and internal friction at room and high temperature

1997 ◽  
Vol 68 (12) ◽  
pp. 4511-4515 ◽  
Author(s):  
G. Roebben ◽  
B. Bollen ◽  
A. Brebels ◽  
J. Van Humbeeck ◽  
O. Van der Biest
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Elastic Moduli ◽  
Resonant Frequencies ◽  
Impulse Excitation

On the Measurement of Dynamic Elastic and Internal Friction Properties of Nickel Based Super Alloys up to 650°C Temperature

2015 ◽  
Vol 830-831 ◽  
pp. 203-206 ◽  
Author(s):  
K. Saravanan ◽  
V.M.J. Sharma ◽  
P. Ramesh Narayanan ◽  
S.C. Sharma ◽  
Koshy M. George
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Shear Modulus ◽  
Elastic Moduli ◽  
Test Facility ◽  
Stressed Condition ◽  
Heating And Cooling ◽  
Test Methodology ◽  
Impulse Excitation ◽  
Nickel Base

Elastic constants are the fundamental key parameters to understand the mechanical behaviour of engineering materials under stressed condition. This paper explains the test methodology and provides results of experiments carried out using resonance based high temperature impulse excitation technique test facility for the measurement of technical elastic moduli i.e., Young’s modulus (E), Shear modulus (G), Poisson’s ratio (ν) and internal friction (Q-1) of two nickel-base polycrystalline super alloys IN718 and Haynes 214 from ambient to 650°C temperature in argon environment during heating and cooling.

Recent Advances in Material Characterization Using the Impulse Excitation Technique (IET)

2007 ◽  
Vol 333 ◽  
pp. 235-238 ◽  
Author(s):  
Akhilesh Kumar Swarnakar ◽  
S. Giménez ◽  
Sedigheh Salehi ◽  
Jef Vleugels ◽  
Omer Van der Biest
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Free Vibration ◽  
Deformation Behaviour ◽  
In Situ Monitoring ◽  
Mechanical Spectroscopy ◽  
Recent Advances ◽  
Standard Procedures ◽  
Impulse Excitation ◽  
Non Destructive

The Impulse Excitation Technique (IET) is a non-destructive technique for evaluation of the elastic and damping properties of materials. This technique is based on the mechanical excitation of a solid body by means of a light impact. For isotropic, homogeneous materials of simple geometry (prismatic or cylindrical bars), the resonant frequency of the free vibration provides information about the elastic properties of the materials. Moreover, the amplitude decay of the free vibration is related to the damping or internal friction of the material. At present, IET is a well-established non-destructive technique for the calculation of elastic moduli and internal friction in monolithic, isotropic materials. Standard procedures are described in ASTM E 1876-99 and DIN ENV 843-2. IET can also be performed at high temperature (HT-IET) using a dedicated experimental setup in a furnace and constitutes a valuable tool in the field of mechanical spectroscopy. In the present work, the most recent advances in high temperature characterization using IET at K.U. Leuven are presented: the deformation behaviour of WC-Co hard metals, softening phenomena in TiB2, relaxation mechanisms in ZrO2 composites and “in-situ” monitoring of the damage evolution in uniaxially pressed metallic green compacts during delubrication.

Search for High Damping Metallic Glasses

2006 ◽  
Vol 319 ◽  
pp. 151-156 ◽  
Author(s):  
Y. Hiki ◽  
M. Tanahashi ◽  
Shin Takeuchi
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Internal Friction ◽  
Metallic Glass ◽  
Room Temperature ◽  
Temperature Stability ◽  
Temperature Peak ◽  
High Temperature Side ◽  
Side Slope ◽  
Temperature Side

In a hydrogen-doped metallic glass, there appear low-temperature and high-temperature internal friction peaks respectively associated with a point-defect relaxation and the crystallization. The high-temperature-side slope of low-temperature peak and also the low-temperature-side slope of high-temperature peak enhance the background internal friction near the room temperature. A hydrogen-doped Mg-base metallic glass was proposed as a high-damping material to be used near and somewhat above the room temperature. Stability of the high damping was also checked.

A Study on Influence of Annealing and Aging on High Temperature Internal Friction in Al-Zr Alloy

2012 ◽  
Vol 535-537 ◽  
pp. 1027-1030
Author(s):  
Xiao Hui Cao ◽  
Yu Wang
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Grain Boundary ◽  
Low Frequency ◽  
Grain Boundary Sliding ◽  
High Temperature Side ◽  
Internal Friction Peak ◽  
Average Grain Size ◽  
Lower Temperature ◽  
Zr Alloy

By using a low frequency inverted torsion pendulum, the high temperature internal friction spectra of Al-0.02wt%Zr and Al-0.1wt%Zr alloys were investigated respectively. In Al-0.02wt%Zr alloy, the conventional grain boundary internal friction peak (Pg) is observed with some small unstable peaks. In Al-0.1wt%Zr alloy, the bamboo peak is observed to appear at the high temperature side of the conventional grain boundary internal friction peak. The conventional grain boundary internal friction peak decreased and moved to higher temperature. The bamboo peak owns an activation energy of 1.75eV. When average grain size exceeded the diameter of samples, Pb strength was reduced and its position was shifted to a lower temperature. Based on the grain boundary sliding model, Pg and Pb peaks were explained. Their dependence on annealing temperature and time was determined by considering the effects of contained Ce atoms and other impurities on the relaxation across grain boundary.

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
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