scholarly journals Determination of dynamic elastic moduli and shear moduli of aged wood by means of ultrasonic devices

2013 ◽  
Vol 47 (6) ◽  
pp. 925-936 ◽  
Author(s):  
Katalin Kránitz ◽  
Markus Deublein ◽  
Peter Niemz
Keyword(s):  
Elastic Moduli ◽  
Shear Moduli ◽  
Dynamic Elastic Moduli ◽  
Ultrasonic Devices

MEASURING OF ELASTIC MODULI BY MEANS OF SUB-SURFACE SOUNDING METHOD

2020 ◽  
pp. 44-53
Author(s):  
A. V. Kozlov
Keyword(s):  
Elastic Moduli ◽  
Point Contact ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Surface Measurement ◽  
Longitudinal And Shear Waves ◽  
Material Sample ◽  
Dynamic Elastic Moduli ◽  
Table Data

The method of determination of elastic moduli for different materials by means of measuring of longitudinal and shear waves’ velocities is discussed in the paper. The velocities are measured by obtaining the time of flight between a pair of low frequency ultrasonic dry point contact transducers installed on the surface of the studied material sample. Factors defining the accuracy of such measurement are indicated which mainly consist of physical velocity frequency dispersion, fundamental although small differences between static and dynamic elastic moduli measurements, velocity dependence on temperature etc. Comparison between Young’s modulus and Poisson’s ratio, obtained experimentally and from table data, is given for various plastics and steel samples. It shows good agreement of different methods’ data and demonstrates the applicability of the suggested elastic moduli ultrasonic sub-surface measurement method.

scholarly journals A symmetrical method to obtain shear moduli from microrheology

Soft Matter ◽  
2018 ◽  
Vol 14 (19) ◽  
pp. 3716-3723 ◽  
Author(s):  
Kengo Nishi ◽  
Maria L. Kilfoil ◽  
Christoph F. Schmidt ◽  
F. C. MacKintosh
Keyword(s):  
Elastic Moduli ◽  
Direct Determination ◽  
Analysis Method ◽  
Shear Moduli ◽  
Mean Squared Displacement ◽  
The Mean ◽  
Symmetrical Method ◽  
Probe Particles

Passive microrheology deduces shear elastic moduli from thermally fluctuating motion of probe particles. We introduce and test an analysis method for direct determination of these moduli from the mean-squared displacement of a probe.

Attenuation of elastic waves in a cracked, fluid-saturated solid

1980 ◽  
Vol 88 (3) ◽  
pp. 547-561 ◽  
Author(s):  
A. K. Chatterjee ◽  
A. K. Mal ◽  
L. Knopoff ◽  
J. A. Hudson
Keyword(s):  
Viscoelastic Material ◽  
Elastic Waves ◽  
Elastic Moduli ◽  
Shear Waves ◽  
Elastic Solid ◽  
Attenuation Coefficients ◽  
Low Frequencies ◽  
Specific Attenuation ◽  
Dynamic Elastic Moduli

AbstractThe problem of the determination of the overall dynamic elastic moduli of an elastic solid permeated by uniformly distributed penny-shaped cracks is considered. The cracks are assumed to be filled with a viscoelastic material. The orientations of the cracks may be either parallel or perfectly random. The overall velocities as well as the specific attenuation coefficients of plane harmonic compressional and shear waves are calculated for low frequencies and dilute concentration of the cracks.

scholarly journals Experimental Determination of Static And Dynamic Elastic Moduli of Rc Slabs

2020 ◽  
Vol 23 (2) ◽  
pp. 535-545
Author(s):  
Mezgeen Ahmed ◽  
◽  
Abdulhameed Yaseen ◽  
Yaman Al-kamaki ◽  
Fouad Mohammad ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Elastic Moduli ◽  
Dynamic Elastic Moduli ◽  
Rc Slabs

scholarly journals Comparison Study of Dynamic Elastic Moduli of Cement Mortar and No-cement Slag Based Cementitious Mortar Activated with Calcined Dolomite with Impulse Excitation Technique

2018 ◽  
Vol 186 ◽  
pp. 02004
Author(s):  
Herry Suryadi Djayaprabha ◽  
Ta-Peng Chang ◽  
Jeng-Ywan Shih
Keyword(s):  
Compressive Strength ◽  
Shear Modulus ◽  
Elastic Moduli ◽  
Cement Mortar ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Shear Moduli ◽  
Dynamic Young’S Modulus ◽  
Impulse Excitation ◽  
Dynamic Elastic Moduli

This paper presents the comparison of an experimental investigation on compressive strength and dynamic elastic moduli of mortars made of Ordinary Portland Cement (OPC) and ground granulated blast furnace slag (GGBFS) incorporating with calcined dolomite. Dolomite powder calcined at temperature 900°C emerged as a GGBFS activator for producing cementitious mortar binder. In this study, no-cement mortar is made by activating GGBFS with calcined dolomite by a fixed amount of 20 wt%. The compressive strengths and dynamic elastic moduli were measured at 7 and 28 days. Comparing with cement mortar, the compressive strength of no-cement mortar was found about 54.4 and 46.9% lower at ages of 7 and 28 days, respectively. Non-destructive evaluation of the dynamic elastic moduli was investigated by impulse excitation technique (IET). It measures the resonant frequencies of induced vibration signal in the flexural and torsional mode for determining the dynamic Young's modulus and the dynamic shear modulus. The Poisson's ratio was calculated by the dynamic Young's modulus and the dynamic shear modulus relationship. The results showed that the 28-day dynamic Young's and shear moduli of cement mortar were 31.91 and 14.43 GPa, respectively. The dynamic Young's and shear moduli of no-cement mortar were lower by 23.3 and 15.2% than that of cement mortar at the age of 28 days. The obtained results showed that the 28-day Poisson's ratio of no-cement mortar had a wider range between 0.177 and 0.209 than that of cement mortar which ranged from 0.180 to 0.185.

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