scholarly journals Effect of the Grain Sizes on the Ultrasonic Propagation and Attenuation on Different Types of Steels Microstructure During Non-Destructive Testing

2021 ◽  
Vol 45 (4) ◽  
pp. 329-334
Author(s):  
Irida Markja ◽  
Klodian Dhoska ◽  
Dervish Elezi ◽  
Reza Moezzi ◽  
Michal Petru
Keyword(s):  
Research Work ◽  
Ultrasonic Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasonic Signals ◽  
Ultrasound Waves ◽  
Different Types ◽  
Shift Frequency ◽  
Ultrasonic Propagation ◽  
Non Destructive

In this paper we have proposed an experimental study of the steel grains sizes effect on the shift frequency of the ultrasonic waves being propagated in steels. Ultrasonic testing has been used in most inspection services for different materials as non-destructive testing. The novelty of our research work has been focused on the investigation of the new method for determining microstructure evolution of metals by using ultrasonic signals in conjunction with changes in grain size and hardness of steels. Furthermore, we have studied the microstructure of steel types S355, S275, Corten B and S275N. The microstructure results of steels have shown the changes that have been undergone from thermal and mechanical processes by using the attenuation of ultrasound waves during non-destructive testing.

scholarly journals Ultrasonic Non-Destructive  Testing of Fibre Reinforced  Composites

2021 ◽  
Author(s):  
◽  
Matthew Thomson
Keyword(s):  
Experimental Work ◽  
Rayleigh Waves ◽  
Ultrasonic Waves ◽  
Reinforced Composites ◽  
Surface Cracks ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Reinforced Composite ◽  
Non Destructive ◽  
Fibre Reinforced Composites

<p>This thesis focuses on the application of high frequency ultrasound as a tool for performing non-destructive testing for pultruded fibre reinforced composite (FRC) rods. These composite rods are popular in the manufacturing, construction and electrical industries due to their chemical, electrical and strength properties. Such FRCs are manufactured on automated production lines that operate day and night. Non-destructive testing techniques are desired to quickly and accurately detectmanufacturing flaws such as coating thickness irregularities and surface cracks. Layers and cracks can present as large changes in acoustic impedance and will strongly reflect ultrasonic waves. Combined with their low cost, east of use and absense of potentially harmful radiation, ultrasound has proven popular worldwide for Non-Destructive Testing. Finite Element Analysis (FEA) was employed to investigate the propagation of ultrasonic waves through layers of material to simulate a thickness measurement and the ability of ultrasound to measure thicknesses was proven. Experimental work was conducted on two fibre reinforced composite samples with varying thickness coatings of plastic and paint. The thickness was measured accurately using immersion transducers at 50MHz and a resolution of 20μm was attained through the use of matched filtering techniques. Surface acoustic waves, particularly Rayleigh waves were investigated using FEA techniques so that the generation, scattering and detection of such waves was understood. This lead to the development of methods for detecting surface cracks in glass using Rayleigh waves and these methods were successfully used in experimental work. Wave propagation in fibre reinforced composites was modelled and experimentally investigated with the results confirming theoretical expectations. Finally a Rayleigh wave was launched onto a fibre reinforced composite sample however the amount of energy leakage into the water was so great, due to the acoustic impedance of water, the detection of the wave was prevented. The conclusion reached was that an immersion setup was not appropriate for launching a travelling Rayleigh wave.</p>

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.

scholarly journals CFRP Non-Destructive Testing Using IR Thermography Methods

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 30
Author(s):  
Swiderski
Keyword(s):  
Construction Materials ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Destructive Testing ◽  
Active Infrared Thermography ◽  
Multilayer Composites ◽  
Military Applications ◽  
Different Types ◽  
The Many ◽  
Non Destructive

Multilayer composites reinforced fibres are often used in military applications as construction materials for lightweight ballistic covers that protect against fragments and projectiles. The basic fibre used in these applications is aramid fibre, but research is also conducted using carbon fibres. One of the many methods used in non-destructive testing of composites is active infrared thermography, in which different types of sources can be used to thermally stimulate the material being tested. This paper compares the results obtained with various methods of thermal stimulation in the study of samples made with CFRP with deliberately introduced defects and destructive tests.

LASER GENERATED ULTRASONIC WAVES FOR NON DESTRUCTIVE TESTING OF COMPOSITE MATERIALS

1992 ◽  
pp. 500-504
Author(s):  
F. GUILLOIS ◽  
C. CORBEL ◽  
D. DAVID ◽  
H. TRETOUT ◽  
R. DE MOL ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ultrasonic Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Ультразвуковой контроль дефектов металлических изделий сложной формы

2021 ◽  
pp. 31-36
Author(s):  
В.В. Ларионов ◽  
А.М. Лидер ◽  
Д.О. Долматов ◽  
Д.А. Седнев
Keyword(s):  
Test Object ◽  
Degrees Of Freedom ◽  
Surface Profile ◽  
Ultrasonic Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Six Degrees Of Freedom ◽  
Wide Range ◽  
Manufactured Products ◽  
Non Destructive

Nowadays, automation is an actual issue in the development of methods and equipment for ultrasonic non-destructive testing. The conditions of modern industrial production require the development and application the automated testing equipment which is versatile to a wide range of manufactured products, which can have a complex shape. In this paper, we propose a technique for ultrasonic testing of complex-shaped objects. Such technique implies the application of six degrees of freedom robotic manipulators to ensure the required refraction angle of ultrasonic waves into the test object at each measuring position. The trajectory of the robot movement during scanning is provided by restoring the surface profile of the test object using optical profilometry and determining the location of the test object relative to the robotic manipulator using a probe tip. Within the framework of this work, the effectiveness of the developed technology is verified experimentally.

scholarly journals THE ANALYSIS OF METHODOLOGIES FOR TESTING COMPRESSIVE STRENGTH IN MASONRY MORTAR JOINTS / MŪRO SKIEDINIO GULSČIOJOJE SIŪLĖJE GNIUŽDOMOJO STIPRIO TYRIMŲ METODŲ ANALIZĖ

2014 ◽  
Vol 6 (5) ◽  
pp. 514-519 ◽  
Author(s):  
Tomas Šlivinskas
Keyword(s):  
Compressive Strength ◽  
Mechanical Characteristics ◽  
Ultrasonic Waves ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Advantages And Disadvantages ◽  
Mortar Strength ◽  
Non Destructive ◽  
Masonry Mortar

The article analyzes masonry as composite material and presents the factors that affect the mechanical characteristics of masonry. The article also deals with the most frequently used destructive and non-destructive testing methods for the compressive strength of masonry mortar as well as related advantages and disadvantages. Moreover, the analysis of methods for testing ultrasonic waves has been carried out. The article reveals that for using the methodology of testing a mortar bonded wafer, the compressive strength correlation of masonry mortar is set between the ascertainment of masonry mortar strength using a regular mortar testing methodology (LST EN 1015-11:2004) and the compressive strength of mortar possibly taken from masonry joints. The obtained results of an experimental study on the samples have demonstrated that the strength reduction ratio of masonry mortar depends on the compressive strength of mortar. The value of the ratio is increasing with the descending compressive strength of mortar. Šiame straipsnyje nagrinėjamas mūras kaip kompozitinė medžiaga. Apžvelgiami veiksniai, veikiantys mechanines mūro charakteristikas. Išnagrinėti dažniausiai taikomi mūro skiedinio gniuždomojo stiprio tyrimų metodai, pateikti metodų privalumai ir trūkumai. Straipsnyje, taikant klijuotų skiedinio plokštelių bandymo metodiką, nustatyta mūro skiedinio gniuždomojo stiprio priklausomybė tarp mūro skiedinio stiprio nustatymo pagal įprastinę skiedinio bandymo metodiką ir skiedinio, tikėtina, paimto iš mūro siūlės, gniuždomojo stiprio.

Mathematical Modeling of Non-Destructive Testing for Layered Materials

2015 ◽  
Vol 760 ◽  
pp. 651-656
Author(s):  
Constantin Stefan Petriceanu ◽  
Oana Virlan
Keyword(s):  
Mathematical Modeling ◽  
Lamb Waves ◽  
Layered Materials ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasound Waves ◽  
Slowness Vector ◽  
Significant Attenuation ◽  
Control Modeling ◽  
Non Destructive

This article deals with mathematical modeling of non-destructive testing of layered materials. Latest research in the nondestructive control modeling with ultrasound waves recommends, for a greater productivity, the use of layer waves Lamb type due to their properties to propagate in solid materials on long distances without any significant attenuation. In the first part it is shown and justified the usage of the choice of Lamb waves to control this type of material. Then follows the theoretical aspects of the modeling and the simulation of the propagation of Lamb waves in layered materials using the mathematical formalism of wave propagation characterization with a vector of type S called slowness vector. Afterwards the mathematical results are presented with the equation of motion within the considered hypothesis, the hypothesis determined in any point of the space of important acoustic parameters in nondestructive testing (in particular the amplitude of the reflected wave quasi-longitudinal wave) based on the known characteristics of the incipient vector (initial impulse). Then follows validation of the developed model based on some simulations using a specialized software. Finally conclusions are presented and prospects for the development of the method.

Application of Ultrasonic Wave and Resistograph for Nondestructive Testing of Defects in Standing Trees

2011 ◽  
Vol 48-49 ◽  
pp. 265-269
Author(s):  
Shi Quan Song ◽  
Hua Dong Xu ◽  
Li Hai Wang
Keyword(s):  
Radial Velocity ◽  
Ultrasonic Wave ◽  
Propagation Velocity ◽  
Influence Factors ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Standing Trees ◽  
Ultrasonic Propagation ◽  
The Relationship ◽  
Non Destructive

In order to carry out non-destructive testing on standing trees, explore the propagation characteristics and the influence factors of the ultrasonic wave spreading in the standing trees. Take simon poplar as the research object, Resistograph were employed to test 30 sample (simon polar) standing trees and it gave a preliminary estimate of the internal defects in the samples, and RSM-SYS5 ultrasonic device were employed to test the ultrasonic propagation velocity spreading in simon poplar standing trees, with the statistics of the ultrasonic propagation velocity spreading separately in the health trees and standing trees with defects, and did a regression analysis of the relationship between the size of the defacts and the ultrasonic propagation velocity. The results show that: 1) When the diameter of sample trees are between 30 and 55cm, the radial velocity of ultrasonic spreading in healthy simon poplar standing trees are in the range of 1029.96m/s ~ 1200m/s, all more than 1000m/s; however, when there are defects in simon poplar standing trees, the ultrasonic radial velocity are less than 1000m/s. 2) The defacts in standing trees have an significant influence on the ultrasonic radial propagation velocity spreading in simon poplar standing trees, defect size and the radial velocity is significantly negatively correlated, and the correlation coefficient R is 0.887.

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