Non-Destructive Evaluation for Horizontal Cracks in RC Slabs of Highway Bridges Based on Analysis-Aided Impact Elastic-Wave Methods

2011 ◽  
pp. 827-834
Author(s):  
S. Uchida ◽  
T. Kamada ◽  
T. Iwasaki ◽  
H. Tsunoda
Keyword(s):  
Elastic Wave ◽  
Highway Bridges ◽  
Non Destructive Evaluation ◽  
Rc Slabs ◽  
Wave Methods ◽  
Non Destructive

scholarly journals NON-DESTRUCTIVE EVALUATION FOR HORIZONTAL CRACKS IN EXISTING RC SLABS BY ANALYSIS-AIDED IMPACT ELASTIC-WAVE METHODS

2012 ◽  
Vol 06 ◽  
pp. 670-675
Author(s):  
Heung-Soo Lee ◽  
Toshiro Kamada ◽  
Shinya Uchida ◽  
Toshiki Iwasaki
Keyword(s):  
Elastic Wave ◽  
Highway Bridges ◽  
Bottom Surface ◽  
Response Analysis ◽  
Wave Method ◽  
Rc Slab ◽  
Ball Diameter ◽  
Rc Slabs ◽  
Wave Methods ◽  
Non Destructive

In this study, impact elastic-wave method was performed at the bottom surface of RC slab cut from an existing highway bridges to survey the horizontal cracks. Before measurements by impact elastic-wave method, impact response analysis was applied to determine optimal steel ball diameter, distance between impact point and receiving point of elastic-wave. Efficiency of analysis-aided impact elastic-wave method was confirmed by drilling and observing the interior of the RC slab by stick scanner. Evaluation results by this method agreed well with results of visual inspection. Thus, validity of the analysis-aided impact elastic-wave method on detection of horizontal cracks in RC slabs of highway bridges was demonstrated.

Non-Destructive Measurement of Residual Stresses by an Ultrasonic Method

2013 ◽  
Author(s):  
Jacob Kleiman ◽  
Yuri Kudryavtsev ◽  
Volodimir Smilenko
Keyword(s):  
Wave Propagation ◽  
Residual Stresses ◽  
Elastic Wave ◽  
Mechanical Stress ◽  
Ultrasonic Method ◽  
Non Destructive Evaluation ◽  
Acoustic Elasticity ◽  
Destructive Measurement ◽  
Non Destructive ◽  
Applied Stresses

An ultrasonic computerized complex for measurement of residual and applied stresses UltraMARS® was recently introduced. Average through thickness stresses can be measured based on the acoustic-elasticity effect, according to which the velocity of elastic wave propagation in solids is dependent on the mechanical stress. The system was used successfully in numerous applications proving to be a reliable, fast and economical way to evaluate residual and applied stresses in materials and structures. The newly developed complex was used in a number of applications that called for non-destructive evaluation of stresses. Examples of such applications will be discussed in the paper. The system was further developed to allow for measurement of subsurface and surface stresses in structural materials and made of them structures.

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