Dynamic Young’s modulus and internal friction in polycrystalline copper

2003 ◽  
Vol 9 (5) ◽  
pp. 439-445 ◽  
Author(s):  
Chang-Seog Kang ◽  
Si-Young Chang ◽  
Sung-Kil Hong
Keyword(s):  
Internal Friction ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Polycrystalline Copper ◽  
Dynamic Young’S Modulus ◽  
Dynamic Young's Modulus

Anelastic Properties of Polycrystalline Copper

2004 ◽  
Vol 449-452 ◽  
pp. 673-676
Author(s):  
Chang Seog Kang ◽  
Sung Kil Hong
Keyword(s):  
Internal Friction ◽  
Young’S Modulus ◽  
Fatigue Testing ◽  
Young's Modulus ◽  
Testing Machine ◽  
Grain Boundary Sliding ◽  
Polycrystalline Copper ◽  
Mechanical Spectroscopy ◽  
Dynamic Young’S Modulus ◽  
Dynamic Young's Modulus

An attempt has been made to measure the temperature dependence of dynamic Young's modulus together with the related variation of internal friction in polycrystalline copper. A mechanical spectroscopy study was used a standard servo hydraulic fatigue testing machine equipped with a scanning laser extensometer. Dynamic Young’s modulus and internal friction are measured over a temperature range of 298 to 873K at very low frequencies of 0.1, 0.05 and 0.01Hz. One internal friction peak was observed over the ranges 450K to 700K, together with marked decreases in the dynamic Young.s modulus in the same temperature ranges. From a quantitative analysis of the experimental data with the relaxation strength, relaxation time and activation energy, it is concluded that the peak phenomenon is due to grain-boundary sliding relaxation.

Dynamic Young’s Modulus and Internal Friction in Composite Materials

1986 ◽  
pp. 143-151 ◽  
Author(s):  
Shigehiro Nishijima ◽  
Kenichi Matsushita ◽  
Toichi Okada ◽  
Taira Okamoto ◽  
Takeshi Hagihara
Keyword(s):  
Composite Materials ◽  
Internal Friction ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Dynamic Young’S Modulus ◽  
Dynamic Young's Modulus

Internal Friction and Young's Modulus of 9Al2O3 2B2O3 Whisker Reinforced Aluminum Matrix Composite

2007 ◽  
Vol 539-543 ◽  
pp. 997-1003
Author(s):  
Chang Seog Kang ◽  
Ik Hyun Oh ◽  
Jae Ik Cho ◽  
Jae Seol Lee ◽  
Cheol Ho Yun ◽  
...  
Keyword(s):  
Internal Friction ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Testing Machine ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Phase Lag ◽  
Aluminum Composite ◽  
Dynamic Young’S Modulus ◽  
Dynamic Young's Modulus

Anelastic behavior of a 9Al2O3·2B2O3 (AlBw) whisker reinforced aluminum composite has been examined through the measurements of the dynamic Young’s modulus and internal friction over a temperature range of 25 to 500°C at frequencies of 0.01, 0.05 and 0.1 Hz. A standard servo-hydraulic mechanical testing machine equipped with an infrared lamp heater was employed, but the dynamic measurement system therein was especially designed by assembling a scanning laser extensometer and a frequency response analyzer for detecting the amplitude and phase lag of strain in response to a sinusoidal time-varying stress. Two peaks of internal friction were observed over the ranges 100 to 250°C (LT peak) and 250 to 400°C (HT peak), together with marked decreases in the dynamic Young's modulus in the same temperature ranges. From a quantitative analysis of the experimental data, it is concluded that the HT peak phenomenon is due to grain-boundary relaxation, whereas the LT peak phenomenon is ascribable to the relaxation caused by stress-directed interfacial diffusion of Al atoms along the whisker-matrix interface.

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