Composite repair patch evaluation using pulse-echo laser ultrasonic correlation mapping method

2018 ◽  
Vol 204 ◽  
pp. 395-401 ◽  
Author(s):  
Young-Jun Lee ◽  
Jung-Ryul Lee ◽  
Jeong-Beom Ihn
Keyword(s):  
Mapping Method ◽  
Laser Ultrasonic ◽  
Composite Repair ◽  
Repair Patch ◽  
Pulse Echo

scholarly journals Detection of Internal Holes in Additive Manufactured Ti-6Al-4V Part Using Laser Ultrasonic Testing

2020 ◽  
Vol 10 (1) ◽  
pp. 365 ◽  
Author(s):  
Jie Yu ◽  
Dongqi Zhang ◽  
Hui Li ◽  
Changhui Song ◽  
Xin Zhou ◽  
...  
Keyword(s):  
Ultrasonic Testing ◽  
Laser Doppler Vibrometer ◽  
Laser Ultrasonic ◽  
Ultrasound Waves ◽  
Hole Defect ◽  
X Ray Computed ◽  
Hole Defects ◽  
Pulse Echo ◽  
The Relationship ◽  
Non Destructive

For a non-contact, non-destructive quality evaluation, laser ultrasonic testing (LUT) has received increasing attention in complex manufacturing processes, such as additive manufacturing (AM). This work assessed the LUT method for the inspection of internal hole defects in additive manufactured Ti-6Al-4V part. A Q-switched pulsed laser was utilized to generate ultrasound waves on the top surface of a Ti-6Al-4V alloy part, and a laser Doppler vibrometer (LDV) was utilized to detect the ultrasound waves. Sub-millimeter (0.8 mm diameter) internal hole defect was successfully detected by using the established LUT system in pulse-echo mode. The method achieved a relatively high resolution, suggesting significant application prospects in the non-destructive evaluation of AM part. The relationship between the diameter of the hole defects and the amplitude of the laser-generated Rayleigh waves was studied. X-ray computed tomography (XCT) was conducted to validate the results obtained from the LUT system.

Parametric optimization of pulse-echo laser ultrasonic system for inspection of thick polymer matrix composites

2020 ◽  
Vol 19 (2) ◽  
pp. 443-453 ◽  
Author(s):  
AD Abetew ◽  
TC Truong ◽  
SC Hong ◽  
JR Lee ◽  
JB Ihn
Keyword(s):  
Composite Structures ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Laser Ultrasonic ◽  
Ultrasonic Signals ◽  
Peak Energy ◽  
Pulse Echo ◽  
Non Destructive

One of the main challenges of using laser ultrasonic techniques for non-destructive testing applications is the typically low signal-to-noise ratio of the laser ultrasonic signals. In the case of thick composite structures, this is even more problematic since composite materials have very strong sound attenuation. This article investigates the effects of laser beam size and profile to the amplitude of pulse-echo laser ultrasonic signals with the constraint that the peak energy density (fluence) must be kept constant under the thermal damage threshold of material like polymer matrix composites. Such constraint is very important for the non-destructive feature of non-destructive testing, yet in a number of the existing parameter studies of laser ultrasonics, it was not fully investigated. In this article, a series of A-scan and C-scan experiments on thick composite specimens shows that the amplitude of the direct waves and the reflected waves increases with the increase in laser beam size with constant peak energy density. This amplitude enhancement significantly improves the propagation depth, thereby optimizing the system for inspection of thick composite structures. The validity of experimental results is verified theoretically by solving the thermoelastic model of epicenter displacement using Laplace–Hankel transformation.

Detection of disbonds in multi-layer bonded structures using the laser ultrasonic pulse-echo mode

Ultrasonics ◽  
2019 ◽  
Vol 94 ◽  
pp. 411-418 ◽  
Author(s):  
Kuanshuang Zhang ◽  
Shicheng Li ◽  
Zhenggan Zhou
Keyword(s):  
Ultrasonic Pulse ◽  
Laser Ultrasonic ◽  
Pulse Echo

Debonding monitoring of a composite repair patch using small-diameter FBG sensors

2004 ◽  
Author(s):  
Shin-ichi Takeda ◽  
Takeharu Yamamoto ◽  
Yoji Okabe ◽  
Nobuo Takeda
Keyword(s):  
Small Diameter ◽  
Composite Repair ◽  
Repair Patch ◽  
Fbg Sensors
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