Elastic wave methods for NDE in concrete based on generalized theory of acoustic emission

2016 ◽  
Vol 122 ◽  
pp. 845-854 ◽  
Author(s):  
Masayasu Ohtsu
Keyword(s):  
Acoustic Emission ◽  
Elastic Wave ◽  
Wave Methods

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.

scholarly journals Diagnosis for Grouted Condition of Transverse Prestressing Tendon in PC Bridges in-Service using Impact Elastic Wave Methods

2014 ◽  
Vol 25 (0) ◽  
pp. 57-64
Author(s):  
Yoshifumi Nagata ◽  
Akira Shiratori ◽  
Takefumi Ito ◽  
Hiroshi Ueki
Keyword(s):  
Elastic Wave ◽  
Wave Methods ◽  
Prestressing Tendon

Acoustic Emission Signals in the Micro-EDM of PCD

2008 ◽  
Vol 33-37 ◽  
pp. 1181-1186 ◽  
Author(s):  
M. Mahardika ◽  
Kimiyuki Mitsui ◽  
Zahari Taha
Keyword(s):  
Acoustic Emission ◽  
Elastic Wave ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Polycrystalline Diamond ◽  
Micro Edm ◽  
Micro Electrical Discharge Machining ◽  
Single Discharge ◽  
Ae Signals

The mechanism of fracture in micro-electrical discharge machining (-EDM) processes is related to the discharge pulses energy. This paper investigates the correlation of fractures and discharge pulses energy in the -EDM of polycrystalline diamond (PCD) to the acoustic emission (AE) signals. The evaluation of fracture mechanism was done by measuring the generation and propagation of elastic wave in single discharge pulse by using AE sensor. The results show a strong correlation between fractures and discharge pulses energy to the AE signals and mechanism of material removal in the -EDM processes.

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