Measurement of Dynamic and Static Modulus for Thin Particleboard

2011 ◽  
Vol 217-218 ◽  
pp. 402-406
Author(s):  
Hai Cheng Yan ◽  
Hou Jiang Zhang ◽  
Lei Zhu ◽  
Yan Liang Sun
Keyword(s):  
Cantilever Beam ◽  
Modulus Of Elasticity ◽  
Traditional Method ◽  
Bending Test ◽  
Small Samples ◽  
Wood Composites ◽  
Static Modulus ◽  
Bending Modulus ◽  
Beam Bending ◽  
Linear Correlations

This document explains and demonstrates a new means of dynamic and static bending evaluation of modulus of elasticity for small samples of thin wood composites. This means is based on the principle of cantilever-beam bending and free vibration, and a cantilever beam testing apparatus has been developed according to this principle. Three kinds of thin particleboard obtained from market were processed and tested. The testing results show that there are significant linear correlations between the cantilever dynamic modulus and the static bending modulus. Through this method, it is feasible to measure the modulus of elasticity for thin wood composites, and compared with traditional method, the static bending test; it can save more time and reduce damage.

Relativity Analysis between Dynamic and Static Modulus of Elasticity on Different Thickness Wood-Plastic Structural Plates

2011 ◽  
Vol 121-126 ◽  
pp. 4254-4258 ◽  
Author(s):  
Gui Wen Yu ◽  
Ying Cheng Hu ◽  
Ji You Gu
Keyword(s):  
Mechanical Properties ◽  
Nondestructive Testing ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Bending Test ◽  
Three Point Bending ◽  
Static Modulus ◽  
Dynamic Modulus Of Elasticity ◽  
Static Modulus Of Elasticity ◽  
Different Thickness

The relativity was evaluated between dynamic modulus of elasticity (MOE) and static MOE, in order to assess the potential of using nondestructive testing (NDT) method as a checking tool for mechanical properties of wood-plastic structural plates. The dynamic MOE was evaluated on a FFT system, and the static MOE was determined by three point bending test. All of specimens were made of polyethylene（PE）and poplar flour. A significant correlation between the dynamic MOE and the static MOE was obtained from relativity analysis. These results suggest that the NDT method could be appropriate to estimate the dynamic MOE of specimens with different thickness.

scholarly journals Ethylene Propylene Diene Monomer (EPDM) Effect on Asphalt Performance

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 315
Author(s):  
Amin Chegenizadeh ◽  
Minn-Oo Aung ◽  
Hamid Nikraz
Keyword(s):  
Modulus Of Elasticity ◽  
Bending Test ◽  
Dissipated Energy ◽  
Ethylene Propylene Diene Monomer ◽  
Initial Stiffness ◽  
Ethylene Propylene ◽  
Stone Mastic Asphalt ◽  
Wheel Tracking Test ◽  
Beam Bending ◽  
Wheel Tracking

The asphalt industry is increasingly developing with greater focus on sustainability. This study focuses on the benefits of a binder modification of stone mastic asphalt (SMA) by adding a rubber—ethylene propylene diene monomer (EPDM)—into a class 320 bitumen. This study observes the advantages that occur for the rutting and fatigue performance of the samples. The binder modification was made by incorporating 0, 2, 4 and 6% binder weight into each sample. The tests performed on the samples were the wheel-tracking test and the four-point beam bending test. The results revealed varied outcomes, with the four-point beam bending test showing the 6% sample having the highest initial stiffness and modulus of elasticity but the lowest cycle to failure. Therefore, the best performer was determined as the 4% sample, which performed consistently throughout, having the highest cumulative dissipated energy and second-highest initial flexural stiffness, modulus of elasticity and cycle to failure results. There was a clear indication of the best performer for the wheel-tracking test, with the 4% sample having the lowest rut depth, although there were signs of further improvement to be achieved within the 4–6% range. In addition, drain-off tests were conducted on the mixtures, and the addition of EPDM significantly reduced the SMA drain-off values. Overall, the best improvements through binder modification for an SMA mix with EPDM concerning fatigue and rutting resistance came from a 4% incorporation.

scholarly journals Durability and Mechanical Performance of Differently Treated Glulam Beams during Two Years of Outdoor Exposure

2020 ◽  
Vol 71 (3) ◽  
pp. 243-252
Author(s):  
Davor Kržišnik ◽  
Miha Humar ◽  
Aleš Straže ◽  
Milan Šernek ◽  
Bogdan Šega ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Mechanical Performance ◽  
Longitudinal Vibration ◽  
Wood Preservative ◽  
Outdoor Exposure ◽  
Bending Test ◽  
Adhesive Bonds ◽  
Static Modulus ◽  
Outdoor Application ◽  
Static Modulus Of Elasticity

The performance of the composites is influenced by the service life of input raw wood material and used adhesives. The aim of the study was to assess the durability and mechanical performance of glulam beams treated in a different way (thermally modified and/or treated with copper-based wood preservative) and exposed in an outdoor application. Glulam beams (83 mm × 68 mm × 1100 mm), made of three layers of Norway spruce (Picea abies) with PUR adhesives used have been exposed in use class 3.2 in a horizontal position since 4th November 2016. Part of the specimens was equipped with MC sensors. Every year, the degradation was evaluated visually. The dynamic modulus of elasticity was determined by longitudinal vibration, and the static modulus of elasticity using a 4-point bending test. On the smaller specimens, cut from glulams, compressive strength, delamination, and shear strength of adhesive bonds were determined. After two years of exposure, the results indicate that the performance of glulams is determined by the wood modification and applied wood preservative.

scholarly journals Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1962
Author(s):  
Przemysław Mania ◽  
Mateusz Gąsiorek
Keyword(s):  
Heat Treatment ◽  
Modulus Of Elasticity ◽  
Acoustic Properties ◽  
Bending Test ◽  
Acoustic Parameters ◽  
Static Modulus ◽  
Spruce Wood ◽  
Before And After ◽  
Different Temperatures ◽  
The Mean

Wedge-shaped boards of spruce wood (Picea abies Karst.) are used to make violin fronts, also known as soundboards. Oil-heat treatment (OHT) can influence the acoustic properties of resonant wood, such as spruce. In this study, the effect of OHT on spruce wood was evaluated, using palm oil as a heating medium, at four different temperatures: 140, 160, 180 and 200 °C. Physical, mechanical and acoustic properties of spruce wood were evaluated before and after OHT and included the following: density, modulus of elasticity in the static bending test, and wood sound velocity. The acoustic parameters after OHT improved; however, the samples bent after modification had a higher modulus of elasticity, with a simultaneous deterioration of the acoustic parameters. The dynamic modulus of elasticity increased by 11%, and the musical constant by 5%. The static modulus increased by more than 3.5%, but the acoustic parameters calculated on the basis of these results indicated a deterioration of the acoustic properties of completely oven-dried wood. The increase in moisture content to air-dried condition contributed to a slight increase in the mean musical constant at the highest modification temperature.

The Effect of Knots on Bending Modulus of Elasticity of Dimension Lumber

2012 ◽  
Vol 517 ◽  
pp. 677-682
Author(s):  
Yong Zhong ◽  
Hai Qing Ren ◽  
Wan Li Lou ◽  
Xia Zhen Li
Keyword(s):  
Regression Analysis ◽  
Modulus Of Elasticity ◽  
Multivariate Regression ◽  
Predictive Accuracy ◽  
Multivariate Regression Analysis ◽  
Average Density ◽  
Full Scale ◽  
Bending Test ◽  
Bending Modulus ◽  
Dimension Lumber

The defects, especially for knot, seriously affect the bending properties of wood. In this paper, full scale specimens and clear specimens for bending test, cut from dimension lumbers of Larix gmelinii with different kinds of knots, aimed to predictive accuracy of the modulus of elasticity (MOE) in bending and to improve the accuracy of MOE by multivariate regression analysis with density and knot information. According to the regression analysis results, the [(IK/Ig)·(MK/Mo)] of all knots and the average density ρa showed the best predictive accuracy of MOE for full scale specimen (Efull), with 0.674 of R2 and 1.15 of RMSE. Based on the ratio of regression parameter B/A of independent variables for density and knots information, the knots had less influential than density on influencing Efull. Finally, a simplified theoretical model that can be used to calculate MOE for dimension lumber, was defined as Efull/Eclear = B[(IK/Ig)·(MK/Mo)]+C .

Nondestructive Evaluation of Red Oak and White Oak Species

2020 ◽  
Vol 70 (3) ◽  
pp. 370-377
Author(s):  
Cristian Grecca Turkot ◽  
Roy Daniel Seale ◽  
Edward D. Entsminger ◽  
Frederico José Nistal França ◽  
Rubin Shmulsky
Keyword(s):  
Modulus Of Elasticity ◽  
Longitudinal Vibration ◽  
Mechanical Tests ◽  
Modulus Of Rupture ◽  
Red Oak ◽  
Quercus Alba ◽  
White Oak ◽  
Static Modulus ◽  
Static Modulus Of Elasticity ◽  
The Relationship

Abstract The objective of this article is to evaluate the relationship between the dynamic modulus of elasticity (MOEd), which was obtained with acoustic-based nondestructive testing (NDT) methods, and static bending properties of two domestic hardwood oak species. The mechanical properties were conducted using static modulus of elasticity (MOE) and modulus of rupture (MOR) in radial and tangential directions. Mechanical tests were performed according to ASTM D143 on small clear, defect-free specimens from the two tree species: red oak (Quercus rubra) and white oak (Quercus alba). The MOEd was determined by two NDT methods and three longitudinal vibration methods based on the fast Fourier transform. The destructive strength values obtained in this study were within the expected range for these species. The MOE was best predicted by NDT methods for both species but also had a strong capability to predict MOR.

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