scholarly journals Dynamic testing of the elastic modulus and shear modulus of full-scale laminated veneer lumber

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 8273-8288
Author(s):  
Yujie Huang ◽  
Si Chen ◽  
Assima Dauletbek ◽  
Xiaojun Yang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Shear Modulus ◽  
Dynamic Testing ◽  
Full Scale ◽  
Test Method ◽  
Modal Frequency ◽  
Laminated Veneer Lumber ◽  
Modal Test ◽  
Excitation Method ◽  
Do So

The feasibility of the dynamic testing was explored for the elastic modulus and shear modulus of full-scale laminated veneer lumber in batches at the production site. In order to do so, dynamic testing and analysis, involving a hammer blow and detection of frequencies, were carried out on the laminated veneer lumber free-plate placed in two ways: suspended and placed on a sponge. The results showed that the mode shape and modal frequency value of the suspended laminated veneer lumber free-plate obtained from the modal test were consistent with those of the specimens placed on the sponge. The elastic modulus and shear modulus values of the laminated veneer lumber free-plate obtained in sponge mode based on the transient excitation method were 3.99% and 3.08% higher than the elastic modulus and shear modulus values of the laminated veneer lumber obtained in suspension mode obtained based on the modal test method. The feasibility and reliability of the elastic modulus and shear modulus values obtained by the laminated veneer lumber free-plate in sponge mode were verified.

Impulse Testing of Brickwork Sewers

1995 ◽  
Vol 14 (1) ◽  
pp. 43-54 ◽  
Author(s):  
A. Sibbald ◽  
C. A. Fairfield Beng ◽  
M. C. Forde Beng
Keyword(s):  
Dynamic Testing ◽  
Frequency Domain Analysis ◽  
Full Scale ◽  
Test Method ◽  
Scale Model ◽  
Integrity Assessment ◽  
Analysis Techniques ◽  
Non Destructive ◽  
Investigation Procedure

This paper describes a study into the application of dynamic testing to the assessment of egg shaped brickwork sewer rings. An investigation procedure using impulsive force hammer excitation with various time and frequency domain analysis techniques is proposed for the location of structural discontinuities in such sewers. The experimental results from a full scale model sewer, and a full scale, in-situ field test on a similar sewer are presented. The chosen non-destructive test method proved to be a convenient tool for the integrity assessment of brickwork sewers.

Comparison on Three Computational and Experimental Schemes on Vibration Modal Frequency

2011 ◽  
Vol 121-126 ◽  
pp. 1697-1701
Author(s):  
Xue Feng Huang ◽  
Ning Ding ◽  
Dan Luo ◽  
Guan Qing Wang ◽  
Yan Liu ◽  
...  
Keyword(s):  
Numerical Method ◽  
Test Method ◽  
Test Scheme ◽  
Ansys Software ◽  
Modal Frequency ◽  
Modal Test ◽  
Analytical Scheme ◽  
Test Platform ◽  
Analysis System ◽  
Vibration Modal

This paper discussed three schemes to obtain vibration modal frequency. First, theoretical numerical method was introduced to simulate the vibration modal by ANSYS software. Second, one kind of traditional experimental modal analytical scheme was designed to obtain modal frequency by computer random signal and vibration analysis system (CRAS). Third, a new experimental modal test scheme was proposed by FBG test platform. A completed case on modal frequency of the cantilever was carried out by three different schemes, in order to evaluate their merits and drawbacks by comparison. Accordingly, computational modal numerical method in combination with experimental modal test method can meet the analytical demand of modal parameters in practice engineering.

Numerical evaluation of contaminants mixing uniformity in a full-scale test chamber with mixing fan

2020 ◽  
pp. 1420326X2097902
Author(s):  
Hai-Xia Xu ◽  
Yu-Tong Mu ◽  
Yin-Ping Zhang ◽  
Wen-Quan Tao
Keyword(s):  
Concentration Distribution ◽  
Test Chamber ◽  
Full Scale ◽  
Numerical Results ◽  
Test Method ◽  
Test Accuracy ◽  
Full Scale Test ◽  
Concentration Region ◽  
Airflow Field ◽  
Scale Test

Most existing models and standards for volatile organic compounds emission assume that contaminants are uniform in the testing devices. In this study, a three-dimensional transient numerical model was proposed to simulate the mass transport process based on a full-scale test chamber with a mixing fan, and the airflow field and contaminants concentration distribution were obtained within the chamber under airtight and ventilated conditions. The model was validated by comparing the numerical results with experimental data. The numerical results show that the contaminant source position and the airflow field characteristics have significant impact on the contaminant mixing, and the fan rotation has an important role in accelerating mixing. In the initial mixing stage, the concentration distribution is obviously uneven; as the mixing progresses, it gradually reaches acceptable uniformity except for some sensitive regions, such as high concentration region at the injection point of the contaminants and low concentration region at the air inlet. To ensure test accuracy, the monitor should avoid above sensitive regions; and some special regions are recommended where contaminant concentration uniformity can be reached sooner. The ventilated chamber results indicate that the mixture of contaminants in the chamber is actually better than the results shown by conventional test method.

scholarly journals Shear modulus and yield stress of foams: contribution of interfacial elasticity

Soft Matter ◽  
2021 ◽  
Vol 17 (14) ◽  
pp. 3937-3944
Author(s):  
Annika R. Völp ◽  
Norbert Willenbacher
Keyword(s):  
Elastic Modulus ◽  
Block Copolymer ◽  
Shear Modulus ◽  
Yield Stress ◽  
Protein Food ◽  
General Correlation

A general correlation of foam shear modulus G0 and yield stress τy with the interfacial elastic modulus of foaming solutions in shear and dilation E∞ was found for surfactant, block-copolymer, protein, food, and particle-stabilized foams.

Full-scale dynamic testing and modal identification of a coupled floor slab system

2012 ◽  
Vol 37 ◽  
pp. 167-178 ◽  
Author(s):  
S.K. Au ◽  
Y.C. Ni ◽  
F.L. Zhang ◽  
H.F. Lam
Keyword(s):  
Dynamic Testing ◽  
Full Scale ◽  
Modal Identification ◽  
Floor Slab

Comportement de pieux d'essais instrumentés sous charge horizontale

1993 ◽  
Vol 30 (1) ◽  
pp. 1-11
Author(s):  
R. Frank ◽  
H. Zervogiannis ◽  
S. Christoulas ◽  
V. Papadopoulos ◽  
N. Kalteziotis
Keyword(s):  
Pile Foundation ◽  
Bending Moment ◽  
Standard Penetration Test ◽  
American Petroleum Institute ◽  
Full Scale ◽  
Test Method ◽  
Cohesionless Soil ◽  
Penetration Test ◽  
Cohesionless Soils ◽  
Final Design

This paper describes the behaviour of two test piles (one bored and postgrouted and one simply bored, both 31.7 m long and 0.75 m in diameter) subjected to horizontal loads. These full-scale pile tests were carried out for the actual design of the pile foundation of a pier of the Evripos cable-stayed bridge. This bridge will link the Euboea Island to mainland Greece. The two piles have already been subjected to bearing capacity tests under axial loadings. The inclinometer measurements, taken during the present tests, yielded, in particular, the deformed shape of the piles as well as the bending moments. Conclusions could be drawn for the final design of the pile foundation with respect to horizontal loadings. Furthermore, various calculation methods using p–y reaction curves for cohesionless soils have been checked: the Ménard pressuremeter method, the method of the American Petroleum Institute recommendations, and the Standard penetration test method of Christoulas. These pile tests show that simple measurements, taken on construction sites, can yield interesting results on the actual behaviour of horizontally loaded piles. Key words : pile, horizontal loading, full-scale test, horizontal loads, bending moment, subgrade reaction modulus, p–y curve, cohesionless soil, Standard penetration test, pressuremeter test.

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