scholarly journals YOUNG'S MODULUS ESTIMATION OF TIMBER BY NON-DESTRUCTIVE TEST BASED ON STRESS WAVE VELOCITY MEASUREMENT

2013 ◽  
Vol 78 (686) ◽  
pp. 833-838
Author(s):  
Kazutaka NAMIE ◽  
Jian JIAO ◽  
Mina SUGINO ◽  
Noriko TAKIYAMA ◽  
Yasuhiro HAYASHI
Keyword(s):  
Young’S Modulus ◽  
Wave Velocity ◽  
Stress Wave ◽  
Velocity Measurement ◽  
Young's Modulus ◽  
Destructive Test ◽  
Stress Wave Velocity ◽  
Non Destructive

scholarly journals Influence of moisture content on estimating Young’s modulus of full-scale timber using stress wave velocity

2017 ◽  
Vol 63 (3) ◽  
pp. 225-235 ◽  
Author(s):  
Mariko Yamasaki ◽  
Chika Tsuzuki ◽  
Yasutoshi Sasaki ◽  
Yuji Onishi
Keyword(s):  
Moisture Content ◽  
Young’S Modulus ◽  
Wave Velocity ◽  
Stress Wave ◽  
Young's Modulus ◽  
Full Scale ◽  
Stress Wave Velocity

One-Sided Stress Wave Velocity Measurement in Concrete

1998 ◽  
Vol 124 (12) ◽  
pp. 1346-1353 ◽  
Author(s):  
J. S. Popovics ◽  
W. Song ◽  
J. D. Achenbach ◽  
J. H. Lee ◽  
R. F. Andre
Keyword(s):  
Wave Velocity ◽  
Stress Wave ◽  
Velocity Measurement ◽  
Stress Wave Velocity

scholarly journals Inspection and Evaluation of Decay Damage in Japanese Cedar Trees Through Nondestructive Techniques

2016 ◽  
Vol 42 (3) ◽  
Author(s):  
Cheng-Jung Lin ◽  
Chia-Ju Lee ◽  
Ming-Jer Tsai
Keyword(s):  
Wave Velocity ◽  
Stress Wave ◽  
Japanese Cedar ◽  
Stress Wave Velocity ◽  
Nondestructive Techniques ◽  
Standard Values ◽  
Wood Deterioration ◽  
The Difference ◽  
Non Destructive ◽  
Evaluation Parameters

The purpose of this study was to investigate the standard values of living, undamaged Japanese cedar (Cryptomeria japonica) trees through different nondestructive techniques. This study also detects the stress wave velocity (V) and tomogram (VT), and resolves corresponding V maps of Japanese cedar trees with and without decay damage for tree risk assessment. A visual tree inspection form, with seven categories of tree damage, is proposed for tree hazard assessment. Different nondestructive evaluation parameters can serve as an index for diagnosing standard values (with or without decay). The VT and corresponding stress wave velocity maps of decay-damaged and damaged Japanese cedar trees can detect the general location and area of wood deterioration. The transversal acoustic velocity values increased with increasing diameter in undamaged trees, and the difference between the maximum and minimum V value of the trunks in undamaged trees fell within a range of constants. The proposed approach can be combined with other non-destructive techniques to better examine and confirm the situation of trees.

FEM Stress Analysis and Strength of Scarf Adhesive Joints of Similar Adherend Subjected to Impact Tensile Loadings

2007 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Yuya Hirayama ◽  
He Dan
Keyword(s):  
Young’S Modulus ◽  
Principal Stress ◽  
Stress Wave ◽  
Young's Modulus ◽  
Three Dimensional ◽  
Maximum Principal Stress ◽  
Adhesive Joints ◽  
Stress Wave Propagation ◽  
Adhesive Thickness ◽  
Three Dimensional Finite Element

The stress wave propagation and stress distribution in scarf adhesive joints have been analyzed using three-dimensional finite element method (FEM). The FEM code employed was LS-DYNA. An impact tensile loading was applied to the joint by dropping a weight. The effect of the scarf angle, Young’s modulus of the adhesive and adhesive thickness on the stress wave propagations and stress distributions at the interfaces have been examined. As the results, it was found that the point where the maximum principal stress becomes maximum changes between 52 degree and 60 degree under impact tensile loadings. The maximum value of the maximum principal stress increases as scarf angle decreases, Young’s modulus of the adhesive increases and adhesive thickness increases. In addition, Experiments to measure the strains and joint strengths were compared with the calculated results. The calculated results were in fairly good agreements with the experimental results.

Propagation velocity model of stress waves in larch wood (Larix gmelinii) three-dimensional space with different moisture contents

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6680-6695
Author(s):  
Xiwen Wei ◽  
Liping Sun ◽  
Hongjv Zhou ◽  
Yang Yang ◽  
Yifan Wang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Wave Velocity ◽  
Stress Wave ◽  
Propagation Velocity ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Stress Waves ◽  
Moisture Contents ◽  
Direction Angle ◽  
Stress Wave Velocity

Based on the effects of stress wave propagation in larch (Larix gmelinii) wood, the propagation mechanism of stress wave was explored, and a theoretical model of the propagation velocity of stress waves in the three-dimensional space of wood was developed. The cross and longitudinal propagation velocities of stress wave were measured in larch wood under different moisture contents (46% to 87%, 56% to 96%, 20% to 62%, and 11% to 30%) in a laboratory setting. The relationships between the propagation velocity of stress waves and the direction angle or chord angle with different moisture contents were analyzed, and the three-dimensional regression models among four parameters were established. The analysis results indicated that under the same moisture content, stress wave velocity increased as the direction angle increased and decreased as chord angle increased, and the radial velocity was the largest. Under different moisture contents, stress wave velocity gradually decreased as moisture content increased, and the stress wave velocity was more noticeably affected by moisture content when moisture content was below the fiber saturation point (FSP, 30%). The nonlinear regression models of the direction angle, chord angle, moisture content, and the propagation velocity of stress wave fit the experiment data well (R2 ≥ 0.97).

Sign in / Sign up

Export Citation Format

Share Document