Internal friction mechanism in improper ferroelectric-ferroelastic Gd2(MoO4)3

1983 ◽  
Vol 48 (1) ◽  
pp. 169-173 ◽  
Author(s):  
S. A. Gridnev ◽  
B. M. Darinskii ◽  
B. N. Prasolov
2021 ◽  
Vol 315 ◽  
pp. 43-49
Author(s):  
Si Bin Zhang ◽  
Ze Chao Jiang ◽  
Qing Chao Tian

Vibration systems require the damping materials operating at high service temperature. In this paper, damping performance of HT100, M2052 and S316L at 350K were evaluated by applying different frequencies, strain amplitudes and heating rates. It is found that the internal friction dependence of frequency of HT100, M2052 and S316L all show a characteristic of Check function, and the resonance frequency has a negative linear correlation with the material physical parameters. The strain amplitude as well as heating rate has no obvious effect on the resonance frequencies of the materials, but significantly enhance the internal friction of the interface damping alloys such as M2052 and HT100, but small on single-phase alloys such as S316L. The internal friction mechanism for HT100 and M2052 are of static hysteresis at 350K, and HT100 and M2052 are applicable candidates for working at temperatures around 350K from the viewpoint of vibration reduction.


2009 ◽  
Vol 614 ◽  
pp. 175-180 ◽  
Author(s):  
Fu Xing Yin ◽  
Li Ming Yu ◽  
De Hai Ping ◽  
Satoshi Iwasaki

The Snoek relaxation, a specific point-defect induced anelastic relaxation phenomenon, is characteristic of an internal friction peak in bcc metals with interstitial solutes. Such internal friction mechanism has not been applied in the development of high damping alloy while grain boundary and twin boundary featured anelastic relaxations are applied in some high damping alloys. In this paper, the fundamental principles and experimental results concerning the Snoek relaxation are reviewed, and the feasibility to apply the Snoek relaxation mechanism into high damping alloys is discussed. Due to the peak-shape behavior in the Snoek relaxation type damping, composition design of a high damping alloys should takes temperature position, broadness and also peak height into account. Ti-Nb-O and Ti-V-Cr-O alloys are designed and fabricated by CCLM casting in our laboratory. It is conformed that the damping behaviors of the alloys are of Snoek relaxation type showing obvious frequency and temperature dependence. While the broadened damping peak caused by the substitutional solutes is advantage to improve the temperature stability of damping capacity, a large concentration of interstitial solute and texture control are required to improve the reduced damping capacity.


2013 ◽  
Vol 560 ◽  
pp. 837-840 ◽  
Author(s):  
Shuke Huang ◽  
Wenrong Huang ◽  
Jianhui Liu ◽  
Jin Teng ◽  
Ning Li ◽  
...  

2009 ◽  
Vol 16-19 ◽  
pp. 84-87 ◽  
Author(s):  
Yun Nan Teng ◽  
Xiao Peng Li ◽  
Hui Ma ◽  
Bang Chun Wen

Friction of two objects or inner friction of loose materials in vibration case can present different characteristics that are different from conventional conditions. The practice shows that vibration can reduce friction coefficient and friction force between two objects, lighten abrasion of objects, reduce energy consumption and increase greatly working efficiency. The mechanism of friction in vibration case was revealed in this paper. The Curve of vibration intensity to internal friction of soil was given. The investigation indicated that friction converts from static to sliding in vibration case. The internal friction is reduced with frequency increasing and there exists the optimal vibration intensity to make internal friction least. At last, nonlinear dynamic model of vibration friction system about compaction equipment was established and its resonance response was obtained.


Vacuum ◽  
2019 ◽  
Vol 168 ◽  
pp. 108833 ◽  
Author(s):  
Fuyuan Wang ◽  
Laifei Cheng ◽  
Shuhua Liang

2001 ◽  
Vol 81 (12) ◽  
pp. 2797-2808
Author(s):  
Rustem Bagramov, Daniele Mari, Willy Benoi

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

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

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