scholarly journals Use of Stress Wave to Evaluate The Repair Quality of Concrete Crack

2017 ◽  
Vol 138 ◽  
pp. 02019 ◽  
Author(s):  
Keng-Tsang Hsu ◽  
Chia-Chi Cheng ◽  
Chih-Hung Chiang ◽  
Hung-Hua Wang
Keyword(s):  
Stress Wave ◽  
Concrete Crack

scholarly journals Development of Testing Platform and Comparison Studies for Wood Nondestructive Testing

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Jian Li ◽  
Yiming Fang ◽  
Jiyong Tang ◽  
Hailin Feng ◽  
Xiongwei Lou
Keyword(s):  
Nondestructive Testing ◽  
Stress Wave ◽  
Virtual Instrument ◽  
Wood Properties ◽  
Time Interval ◽  
Peak Time ◽  
Testing Platform ◽  
Time Interval Measurement ◽  
Nondestructive Testing Methods

Stress wave based techniques have been developed for evaluating the quality of the wooden materials nondestructively. However the existing techniques have some shortcomings due to the significant variation of the wood properties and are now in need of updating. There are also stress wave based instruments which have been widely used for nondestructive testing of wood. But most of them are inflexible and unsuitable for the tentative studies. This paper proposed and implemented a wood nondestructive testing platform based on NI virtual instrument. Three wood nondestructive testing methods, including peak time interval measurement, cross-correlation, and spectrum analysis, were also tested on this platform with serious decay sample, early decay sample, and defect-free sample. The results show that new methods can be verified easily and the researches of wood nondestructive testing will be accelerated with the designed platform.

Application of Stress Wave Reflection Method in Nondestructive Testing of Bolt

2012 ◽  
Vol 446-449 ◽  
pp. 2229-2233 ◽  
Author(s):  
Xian Kai Bao ◽  
Yi Li
Keyword(s):  
Nondestructive Testing ◽  
Stress Wave ◽  
Wave Reflection ◽  
Reflection Method ◽  
Testing Technique ◽  
The World ◽  
History Of ◽  
Estimate Quality

Bolt has been used widely in geoengineering all over the world in recent years, the testing technique of bolt develops quickly too. This paper summarizes simply the history of bolt testing technique, describes in detail stress wave reflection method. It is useful and valuable nondestructive.Testing method is verified with several parameters which estimate quality of bolting integrity.

Evaluating the Compaction Quality of Backfills by Stress Wave Velocities

2011 ◽  
Vol 39 (5) ◽  
pp. 103428
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Jiunnren Lai ◽  
Shengmin Wu ◽  
Chih-Hung Chiang
Keyword(s):  
Stress Wave ◽  
Wave Velocities

Experimental Study of Pile Foundation Dynamic Testing Used in the Anchor Rod Nondestructive Testing

2012 ◽  
Vol 166-169 ◽  
pp. 559-562
Author(s):  
Li Wei Zhang ◽  
Wei Shi ◽  
Yu Na Zou ◽  
De Sheng Zhu
Keyword(s):  
Nondestructive Testing ◽  
Stress Wave ◽  
Pile Foundation ◽  
Dynamic Testing ◽  
Solid Material ◽  
Wave Theory ◽  
Small Strain ◽  
Elastic Rod ◽  
Testing Technology

The dynamic testing of stress wave reflection method is an easy, economical, rapid and reliable nondestructive testing technology and has been perfected used in the pile foundation dynamic testing. Anchor rod is more in line with the wave theory of one-dimensional elastic rod than pile foundation whether to theory or the geometric solid, material, stress state and other factors. The quality of anchor rod is determined by using small strain method (hammering method) of pile foundation dynamic measurement. Four testing anchor rods with different length and integrity were made in project of "China Marine Sport School", stress wave time domain curve of anchor rod was obtained by ZK-7E portable intelligent testing of piles instrument, defect location, length of anchor rod and integrity reflected by measured waveform are consistent with the actual situation, the method using pile foundation dynamic testing technology for anchor rod nondestructive testing is proved feasible and reliable.

Experimental Study on Slab Track Passenger Transportation Special Line Roadbed Power Response

2010 ◽  
Vol 34-35 ◽  
pp. 238-241
Author(s):  
Ming Yue Ma ◽  
Ke Wu ◽  
Cheng Hao Gu
Keyword(s):  
Wave Velocity ◽  
Stress Wave ◽  
Dominant Frequency ◽  
Slab Track ◽  
Passenger Transportation ◽  
Railway Passenger ◽  
Under Construction ◽  
Power Response ◽  
Transversal Wave Velocity

In order to assure the security of Wuhan–Guangzhou railway passenger dedicated line, the experiment study of dynamic response was developed in the construction finished roadbed. The longitudinal wave velocity and the transversal wave velocity of stress wave in the roadbed were obtained. The weaken rule of stress wave in roadbed was analyzed during its dissemination and the dominant frequency was gained in the vibration structure. The dynamic modulus of elasticity and the poisson's ratio of roadbed material were defined. Furthermore, the experiment simulated the process of train instant load during transmitting in the roadbed. The influence of roadbed material, structural property to locomotive safe, steady movement was researched. These conclusions provide uses for reference importantly to guarantee the quality of slab track on railway passenger special line under construction.

scholarly journals Stress wave techniques for determining quality of dimensional lumber from switch ties

1995 ◽  
Author(s):  
K. C. Schad ◽  
D. E. Kretschmann ◽  
K. A. McDonald ◽  
R. J. Ross ◽  
D. W. Green
Keyword(s):  
Stress Wave

Research on early Concrete Crack Control of Shijiazhuang Subway Construction in Winter

2014 ◽  
Vol 580-583 ◽  
pp. 1134-1137
Author(s):  
Xiang Mei Yu ◽  
Li Jun Cao ◽  
Dong Yang Geng
Keyword(s):  
Temperature Stress ◽  
Civil Engineering ◽  
Difficult Problem ◽  
Construction Quality ◽  
Concrete Cracking ◽  
Crack Control ◽  
Concrete Crack ◽  
Subway Construction

The control of concrete cracking is a complicated and difficult problem for civil engineering. It is more difficult to control the cracking of the concrete poured in the winter. Thorough the analysis of the construction of the Shijiazhuang subway in winter, several methods are integrally applied. Frost proof and decreasing the temperature stress of concrete is considered together. The construction quality of the concrete arrive a satisfied level and the cracking of the concrete is successfully handled.

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