scholarly journals A new experimental device for rapid measurement of the trunk equivalent modulus of elasticity on standing trees

2000 ◽  
Vol 57 (4) ◽  
pp. 361-359 ◽  
Author(s):  
Jean Launay ◽  
Philippe Rozenberg ◽  
Luc Paques ◽  
Jean-Marc Dewitte
Keyword(s):  
Modulus Of Elasticity ◽  
Experimental Device ◽  
Rapid Measurement ◽  
Standing Trees ◽  
Equivalent Modulus

scholarly journals Non-Destructive Measurement of the Modulus of Elasticity of Wood Using Acoustical Stress Waves

2016 ◽  
Vol 42 (4) ◽  
Author(s):  
Gregory Dahle ◽  
Aaron Carpenter ◽  
David DeVallance
Keyword(s):  
Stress Wave ◽  
Modulus Of Elasticity ◽  
Flexural Modulus ◽  
Testing Machine ◽  
Prediction Equation ◽  
Biomechanical Models ◽  
Standing Trees ◽  
Acoustic Testing ◽  
Destructive Measurement ◽  
Non Destructive

Many biomechanical models include modulus of elasticity (E) but it is not always available in the literature. It would be useful to directly measure E for species, and one of the standard techniques for doing so is to utilize a universal testing machine (UTM). While laboratory testing can determine static flexural modulus of elasticity using a UTM, it requires destructive sampling and therefore is only useful after a tree or limb has been removed. Acoustic testing can be used to estimate the dynamic modulus of elasticity (DMOE) of wood, by measuring the speed of sound through a sample of wood without the need to remove any wood samples. This research investigated if acoustic testing can be used to accurately estimate the modulus of elasticity of green wood. Stump sprouts arising after a shelterwood harvest were cut and left at room temperature (21.1°C, warm) or conditioned to -6.7°C (frozen). The modulus of elasticity was measured using a stress-wave timer (DMOE) and a UTM (ES). The DMOE was higher in the frozen samples, but temperature did not affect ES. While the stress-wave timer used in the study found a slightly higher E than a UTM, a simple prediction equation was determined for converting the results. Researchers believe tools such as this can be successfully utilized by the arboriculture industry to rapidly assess the modulus of elasticity of standing trees in the field.

scholarly journals Rapid measurement of trunk MOE on standing trees using RIGIDIMETER

2002 ◽  
Vol 59 (5-6) ◽  
pp. 465-469 ◽  
Author(s):  
Jean Launay ◽  
Milosh Ivkovich ◽  
Luc P�ques ◽  
Catherine Bastien ◽  
Pascal Higelin ◽  
...  
Keyword(s):  
Rapid Measurement ◽  
Standing Trees

A Note on the Equivalent Modulus of Elasticity of Stay Cables

2011 ◽  
Vol 255-260 ◽  
pp. 1266-1269
Author(s):  
Yi Xiao ◽  
Wei Dong Zhuo ◽  
Li Chu Fan
Keyword(s):  
Modulus Of Elasticity ◽  
Proper Choice ◽  
Stay Cables ◽  
Equivalent Modulus

A new equivalent modulus of elasticity of stay cables is derived based on previous research works. The result of the proposed formula is close to Ernst’s formula and can be regarded as a theoretical supplement of existing works. Compared with the preset formula and other related works, Ernst’s formula is a proper choice for the equivalent modulus of elasticity of stay cables.

scholarly journals Proposal of Design Formulae for Equivalent Elasticity of Masonry Structures Made with Bricks of Low Modulus

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Muhammad Ridwan ◽  
Isamu Yoshitake ◽  
Ayman Y. Nassif
Keyword(s):  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Elastic Moduli ◽  
Masonry Structures ◽  
Quadrilateral Elements ◽  
Fe Simulations ◽  
Low Elastic Modulus ◽  
Low Modulus ◽  
Equivalent Modulus ◽  
Simplified Formula

Bricks of low elastic modulus are occasionally used in some developing countries, such as Indonesia and India. Most of the previous research efforts focused on masonry structures built with bricks of considerably high elastic modulus. The objective of this study is to quantify the equivalent elastic modulus of lower-stiffness masonry structures, when the mortar has a higher modulus of elasticity than the bricks, by employing finite element (FE) simulations and adopting the homogenization technique. The reported numerical simulations adopted the two-dimensional representative volume elements (RVEs) using quadrilateral elements with four nodes. The equivalent elastic moduli of composite elements with various bricks and mortar were quantified. The numerically estimated equivalent elastic moduli from the FE simulations were verified using previously established test data. Hence, a new simplified formula for the calculation of the equivalent modulus of elasticity of such masonry structures is proposed in the present study.

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