The determination of poisson's ratio and the dynamic modulus of elasticity from the frequencies of natural vibration in thick circular plates

1965 ◽  
Vol 2 (2) ◽  
pp. 116-127 ◽  
Author(s):  
Gustáv Martinček
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Poisson’S Ratio ◽  
Natural Vibration ◽  
Poisson's Ratio ◽  
Circular Plates ◽  
Dynamic Modulus Of Elasticity

Influence of the Poisson’s Ratio on the Value of the Dynamic Modulus of Elasticity of Cement Materials in the Early Stage of Ageing

2019 ◽  
Vol 292 ◽  
pp. 50-55 ◽  
Author(s):  
Romana Halamová ◽  
Dalibor Kocáb ◽  
Barbara Kucharczyková ◽  
Petr Misák ◽  
Martin Alexa
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Poisson’S Ratio ◽  
Cement Mortar ◽  
Early Stage ◽  
Ultrasonic Measurement ◽  
Poisson's Ratio ◽  
Cementitious Composite ◽  
Degree Of Hydration ◽  
Dynamic Modulus Of Elasticity

The paper deals with the influence of the Poisson’s ratio on the calculated modulus of elasticity of a cementitious composite in the early stage of its ageing. The dynamic modulus of elasticity was determined in the first 24 hours of ageing of the material using the Vikasonic ultrasonic device. Within the experiment, two types of cementitious composites were mixed - cement paste and cement mortar, both having the same water/cement ratio. It is presumed that the value of the dynamic modulus of elasticity calculated on the basis of ultrasonic measurement is closely related to the value of the Poisson’s ratio, which is not constant during ageing of the cementitious composite but varies depending on the degree of hydration of the material. The output of the paper is a comparison of the development of the dynamic modulus of elasticity calculated using different values of the Poisson’s ratio.

Experimental Research on the Dynamic Young’s Modulus of Specified Density Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 164-167
Author(s):  
Xiao Er Zhou ◽  
Yan Kun Zhang ◽  
De Min Jiang
Keyword(s):  
Young’S Modulus ◽  
Experimental Research ◽  
Vibration Frequency ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Natural Vibration ◽  
Young's Modulus ◽  
Natural Vibration Frequency ◽  
Dynamic Modulus Of Elasticity ◽  
Static Young’S Modulus

From the experimental research, the relations between the dynamic modulus of elasticity and natural vibration frequency of specified density concrete are studied, the static Young’s modulus and dynamic modulus are compared. Based on regression analysis, the influence of different Substitution ratio of lightweight aggregate, age of concrete and cement water ratio is studied. According to the test results, the formula of natural vibration frequency and the dynamic modulus of elasticity of Specified density concrete is given, which provide theory basis for the nondestructive detector of the specified density concrete.

Pulse Method Used for Non-Destructive Assessment of Glued Laminated Timber Beams

2016 ◽  
Vol 827 ◽  
pp. 231-234 ◽  
Author(s):  
Pavel Klapálek ◽  
Lenka Melzerová ◽  
Tomáš Plachy
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Pulse Method ◽  
Dynamic Modulus Of Elasticity ◽  
Glued Laminated Timber ◽  
Non Destructive ◽  
Timber Beams ◽  
The Way

This text is focused on GLULAM (glued laminated timber) beams and determination of their properties. This text is mainly focused just on part of more complex research of glued laminated timber beams. This text is focused on pulse method, which is used to determine the dynamic modulus of elasticity of GLULAM beams. This text will describe how the pulse method works, with basic description, describes the tested material and compare the results of testing. In the conclusion we discuss the results, make conclusions and describe the way of our further research of glued laminated timber beams.

Usage of Digital Image Correlation (DIC) in Determination of Modulus of Elasticity and Poisson's Ratio of Special Concrete

2018 ◽  
Vol 272 ◽  
pp. 154-159
Author(s):  
Vladimír Suchánek ◽  
Tomáš Bednarz ◽  
Tomáš Svojanovský
Keyword(s):  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Poisson’S Ratio ◽  
Vertical Direction ◽  
High Strength ◽  
Image Correlation ◽  
Poisson's Ratio ◽  
Fibre Reinforced Concrete ◽  
Steel Fibre Reinforced Concrete

This paper deals with an evaluation of long-term experimental work carried out in cooperation with concrete suppliers and a specific company (named Sobriety). The key part of this work is focused on the experimental determination of secant modulus of elasticity and Poisson's Ratio of special concrete (self-compacting concrete, steel fibre reinforced concrete, polymer fibre reinforced concrete, specific high-strength concrete). Two different real-time approaches were used to detect modulus of elasticity. In parallel, both approaches - the (European) standard approach and the DIC (2D DIC; 3D DIC with varying lengths in the vertical direction) - were applied.

Determination of the Dynamic Modulus of Elasticity and the Thickness of Concrete Structures by Non-Destructive Methods

2016 ◽  
Vol 691 ◽  
pp. 344-355
Author(s):  
Milan Pokorny ◽  
Norbert Jendzelovsky ◽  
Lenka Konecna
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Ultrasonic Method ◽  
Concrete Structures ◽  
Measuring Devices ◽  
Dynamic Modulus Of Elasticity ◽  
Non Destructive ◽  
Good Coincidence ◽  
Destructive Methods

This paper deals with the determination of selected parameters (the thickness and the dynamic modulus of elasticity) of concrete structures by non-destructive methods. Short overview of the literature, the description of used methods, measuring devices used during the tests, the descriptions of examined structures, and obtained results are mentioned. Two independent methods (the Ultrasonic Method and the Resonant Method, in some case with the combination of the Phase Velocity Method), had been used for determination of required parameters of structures. The results had been in good coincidence with the values mentioned in the literature. At the end of the paper, obtained results are summarized and future plans are presented.

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