Non-destructive evaluation of ceramics by photoacoustic and high-frequency ultrasonic methods

1990 ◽  
Vol 23 (1) ◽  
pp. 47
Keyword(s):  
High Frequency ◽  
Ultrasonic Methods ◽  
Non Destructive Evaluation ◽  
Non Destructive

Laser-Generated Ultrasonic Technique for Inspecting Delamination in CFRP

2006 ◽  
Vol 321-323 ◽  
pp. 968-971
Author(s):  
Won Su Park ◽  
Sang Woo Choi ◽  
Joon Hyun Lee ◽  
Kyeong Cheol Seo ◽  
Joon Hyung Byun
Keyword(s):  
High Frequency ◽  
Ultrasonic Method ◽  
Piezoelectric Sensor ◽  
Frequency Component ◽  
Guided Wave ◽  
Center Frequency ◽  
High Frequency Component ◽  
Ultrasonic Technique ◽  
Non Destructive Evaluation ◽  
Non Destructive

For improving quality of a carbon fiber reinforced composite material (CFRP) by preventing defects such as delamination and void, it should be inspected in fabrication process. Novel non-contacting evaluation technique is required because the transducer should be contacted on the CFRP in conventional ultrasonic technique during the non-destructive evaluation and these conventional contact techniques can not be applied in a novel fiber placement system. For the non-destructive evaluation of delamination in CFRP, various methods for the generation and reception of laser-generated ultrasound are applied using piezoelectric transducer, air-coupled transducer, wavelet transform technique etc. The high frequency component of laser-generated guided wave received with piezoelectric sensor disappeared after propagating through delamination region. Air-coupled transducer was tried to be adopted in reception of laser-generated guided wave generated by using linear slit array in order to generate high frequency guided wave with a frequency of 1.1 MHz. Nevertheless, it was failed to receive high frequency guided wave in using air-coupled transducer and linear slit array. Transmitted laser-generated ultrasonic wave was received on back-wall and its frequency was analyzed to establish inspecting technique to detect delamination by non-contact ultrasonic method. In a frequency spectrum analysis, intensity ratio of low frequency and center frequency was approvable parameter to detect delamination.

Non-Destructive Evaluation of Composite Adhesive Kissing Bond

2013 ◽  
Author(s):  
Yingtao Liu ◽  
Joel Johnston ◽  
Aditi Chattopadhyay
Keyword(s):  
Structural Integrity ◽  
Adhesive Bond ◽  
Image Correlation ◽  
Bonded Joints ◽  
Hydraulic Test ◽  
Ultrasonic Methods ◽  
Non Destructive Evaluation ◽  
Test Frame ◽  
Adhesive Bonded Joints ◽  
Non Destructive

Adhesive bonded joints have been increasingly employed in aerospace, automotive, and other mechanical systems due to the advantages of uniform stress distribution, less stress concentration, light in weight, etc. However, the early damage stage of the adhesive bond joints, which are usually named as kissing bond, can significantly impact the structural integrity and safety. Kissing bond is difficult to detect and identify using current non-destructive evaluation (NDE) techniques since there is no clearly gap or interface between the bond area. Attempts using advanced ultrasonic methods have reached limited success, but more reliable methods need to be developed before adhesive joints can be more widely applied to the engineering field. This paper focuses on the development of detection method using digital image correlation (DIC) technique. Three types of adhesive kissing bond joint samples were fabricated using different contamination recipe to simulate the kissing bonds. The performance of the fabricated joint samples were tested using uniaxial hydraulic test frame and the detection capability of DIC system was investigated. The noncontact strain field measurement method using DIC can indicate the existence of kissing bonds with limited load. The results of DIC measurement is encouraging and can be further used for the NDE estimation of mechanical properties of the kissing bond.

scholarly journals Mathematical modelling of ultrasonic non-destructive evaluation

2001 ◽  
Vol 5 (3) ◽  
pp. 165-180 ◽  
Author(s):  
Larissa Ju Fradkin ◽  
Victor Zalipaev ◽  
Dmitri Gridin
Keyword(s):  
Mathematical Modelling ◽  
High Frequency ◽  
Pulse Propagation ◽  
Nuclear Reactors ◽  
Near Field ◽  
Ultrasonic Transducers ◽  
Non Destructive Evaluation ◽  
Non Destructive

High-frequency asymptotics have been used at our Centre to develop codes for modelling pulse propagation and scattering in the near-field of the ultrasonic transducers used in NDE (Non-Destructive Evaluation), particularly of walls of nuclear reactors. The codes are hundreds of times faster than the direct numerical codes but no less accurate.

scholarly journals High-frequency electromagnetic non-destructive evaluation for high spatial resolution, using metamaterials

2012 ◽  
Vol 468 (2146) ◽  
pp. 3080-3099 ◽  
Author(s):  
Raimond Grimberg ◽  
Gui-Yun Tian
Keyword(s):  
Spatial Resolution ◽  
High Frequency ◽  
Printed Circuit Boards ◽  
Carbon Fibres ◽  
Circuit Boards ◽  
Non Destructive Evaluation ◽  
Low Energies ◽  
Metallic Strip ◽  
Carbon Fibre Reinforced Plastic ◽  
Non Destructive

This study presents a new high-frequency electromagnetic method for a non-destructive evaluation of metallic strip gratings from printed circuit boards and of some carbon-fibre-reinforced plastic composites, allowing the detection of small defects. The electromagnetic transducer is based on a metamaterial lens realized with two conical Swiss rolls, that allows the transmission and intensification of purely evanescent modes generated in the slits of metallic strip gratings and in the dielectric that insulate the carbon fibres between them. The method and the transducer used allow the localization of metallic strip interruptions whose widths are greater than 0.2 mm, the non-alignment of carbon fibres, the breaking of carbon fibres, the lack of resin or delaminations due to impact at low energies, with spatial resolution being greater than 0.1 mm.

scholarly journals Laboratory Study on Non-Destructive Evaluation of Polyethylene Liquid Storage Tanks by Thermographic and Ultrasonic Methods

CivilEng ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 823-851
Author(s):  
Amir Behravan ◽  
Matthew M. deJong ◽  
Alexander S. Brand
Keyword(s):  
Ultrasonic Testing ◽  
Visual Inspection ◽  
Phased Array ◽  
Road Maintenance ◽  
Storage Tanks ◽  
Ultrasonic Methods ◽  
Liquid Storage ◽  
Non Destructive Evaluation ◽  
Deicing Chemicals ◽  
Non Destructive

High-density polyethylene (HDPE) above-ground storage tanks (AST) are used by highway agencies to store liquid deicing chemicals for the purpose of road maintenance in the winter. A sudden AST failure can cause significant economic and environmental impacts. While ASTs are routinely inspected to identify signs of aging and damage, current methods may not adequately capture all defects, particularly if they are subsurface or too small to be seen during visual inspection. Therefore, to improve the ability to identify potential durability issues with HDPE ASTs, additional non-destructive evaluation (NDE) techniques need to be considered and assessed for applicability. Specifically, this study investigates the efficiency of using infrared thermography (IRT) as a rapid method to simultaneously examine large areas of the tank exterior, which will be followed by closer inspections with conventional and phased array ultrasonic testing (UT) methods. Results show that IRT can help to detect defects that are shallow, specifically located within half of the tank’s wall thickness from the surface. UT has the ability to detect all defects at any depth. Moreover, phased array UT helps to identify stacked defects and characterize each defect more precisely than IRT.

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