scholarly journals Non-Destructive Testing of Low-Velocity Impacted Composite Material Laminates through Ultrasonic Inspection Methods

2019 ◽  
Author(s):  
Tiziana Segreto ◽  
Roberto Teti ◽  
Valentina Lopresto
Keyword(s):  
Composite Material ◽  
Ultrasonic Inspection ◽  
Non Destructive Testing ◽  
Low Velocity ◽  
Destructive Testing ◽  
Non Destructive

DESIGN OF NON DESTRUCTIVE TESTING ON COMPOSITE MATERIAL USING PARALLEL PLATE ELECTRICAL CAPACITANCE TOMOGRAPHY: A CONCEPTUAL FRAMEWORK

2017 ◽  
Vol 79 (5-2) ◽  
Author(s):  
Wan Norhisyam Abd Rashid ◽  
Elmy Johana Mohamad ◽  
Ruzairi Abdul Rahim ◽  
A Shamsul Rahimi Subki ◽  
Abdul Latiff Ahood ◽  
...  
Keyword(s):  
Composite Material ◽  
Conceptual Framework ◽  
Parallel Plate ◽  
Electrical Capacitance Tomography ◽  
Parallel Plates ◽  
Non Destructive Testing ◽  
Electrical Capacitance ◽  
Destructive Testing ◽  
Capacitance Tomography ◽  
Non Destructive

In this paper, a conceptual framework for a non destructive testing to check defect on composite material using parallel plate electrical capacitance tomography is being proposed. At the early stage, the possibility of using this method is being simulated using Comsol Multiphysic software. The simulation process has shown promising results to make this concept works. When a dielectric material is placed between the parallel plates, the permittivity distribution can be observed. As the number of electrodes of the sensor are increased from 2 to 8 electrodes, the capacitance value increase from 2.0131e-11-2.3532e-14i F to 5.2474e-11-3.0756e-13i F. Furthermore, there are significant results when the size and the permittivity of the object are varies. 

Investigation of Interaction of Laser Generated Lamb Waves With Structures of Interest

2011 ◽  
Author(s):  
Lei Yang ◽  
I. Charles Ume
Keyword(s):  
Lamb Waves ◽  
Test Procedure ◽  
Ultrasonic Inspection ◽  
Wave Number ◽  
Laser Generation ◽  
Great Promise ◽  
Non Destructive Testing ◽  
Electromagnetic Acoustic Transducer ◽  
Destructive Testing ◽  
Non Destructive

Laser generation/EMAT (electromagnetic acoustic transducer) reception ultrasonic inspection technique shows a great promise in the field of Non-Destructive Testing of welds due to its non-contact nature. However, the broadband nature of laser generation and the dispersive characteristic of Lamb waves make the laser generated ultrasonic signals in thin structures extremely complicated. In order to ease the interpretation of received signals, it is desirable to investigate the interactions of different structural features with Lamb waves and find their related signatures in signal, which offers the potential to detect different types of weld defects using a single test procedure. This work proposed a technique based on 2-D Fourier Transformation to investigate the laser generated Lamb waves experimentally and to find the most sensitive predictors in EMAT received signals corresponding to a specific structural feature of interest. The amplitudes of different Lamb wave modes in the wave-number/frequency domain provide a wealth of information. The demonstration of the technique was carried out on aluminum plates with isolated rectangular notches of different depths. The procedure introduced here is general which can be employed in other applications of Non-Destructive Testing.

scholarly journals Using the Correlation Function in Ultrasonic Non-destructive Testing

10.14311/348 ◽  
2002 ◽  
Vol 42 (3) ◽  
Author(s):  
M. Kreidl ◽  
P. Houfek
Keyword(s):  
Correlation Function ◽  
Cross Correlation ◽  
Ultrasonic Inspection ◽  
Ultrasonic Signal ◽  
Cross Correlation Function ◽  
Statistical Dependence ◽  
Measured Signal ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

This paper deals with ultrasonic signal de-noising by means of correlation. It is commonly known that the cross-correlation function shows the statistical dependence between two signals. In ultrasonic inspection, the measured signal is taken as the first signal. The most important aspect of this method is the choice of the second signal. Various types of the second signals can be tried.

Ultrasonic B-Scan of Adhesive Bonded Thin Aluminum Sheet

2017 ◽  
Vol 268 ◽  
pp. 407-412
Author(s):  
Azim Fikri Mhd Subre ◽  
Md Supar Rohani
Keyword(s):  
Sound Wave ◽  
Ultrasonic Inspection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Bonded Materials ◽  
Testing Method ◽  
Thin Aluminum ◽  
Pass Through ◽  
The Waves ◽  
Non Destructive

Ultrasonic inspection using b-scan (brightness scan) and its application for discontinuity and flaws detection were investigated. Brightness scan is one of the ultrasonic technique’s branches, it provides thorough image of the material which undergone inspection via density of the material where then depicted in different colour in conjunction with the acoustic impedance of the phase gone through by the sound wave. The sound wave generated with a piezoelectric transducer was propagated through aluminum wafer samples and were identified by the b-scan system. Its ability to detect flaw at certain depth which was introduced manually been examined. Experimental results show different brightness characteristic, depending on the adhesive treatments, type of material and medium when the waves pass through in each sample. Brightness scan system was proven to be reliable non-destructive testing method in ultrasonic for inspection of structural bonded materials.

Non-Destructive Testing with Ultrasound in Rails and Ship Plates

2014 ◽  
Vol 605 ◽  
pp. 613-616
Author(s):  
Panagiotis I. Chatzifotis
Keyword(s):  
Ultrasonic Inspection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasound Technique ◽  
Straight Beam ◽  
Pulse Echo ◽  
Thickness Measurements ◽  
Non Destructive ◽  
Pulse Echo Method

This paper deals with finding of defects, such as cracks, breakdowns and inclusions in rails and in ship plates, by ultrasound technique. Pulse echo method and twin beams technique is some of the ultrasonic inspection methods we have used for thickness measurements and for inspection of the welds. Initially, the thickness of rails and ship plates was measured by ultrasound devices using straight beam transducers and then the weldings of these samples were checked by using angle beam transducers.

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