scholarly journals Non-Destructive Testing of Aircraft Structures Using Microwire-Based Tensile Stress Sensor

2020 ◽  
Vol 10 (22) ◽  
pp. 8218
Author(s):  
Miroslav Šmelko ◽  
Katarína Draganová ◽  
Pavol Lipovský ◽  
Karol Semrád ◽  
Monika Blišťanová ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Magnetic Sensors ◽  
Material Surface ◽  
Material Structure ◽  
Sensing Element ◽  
Destructive Testing ◽  
Aircraft Structures ◽  
Stress Sensors ◽  
Non Destructive

The development of non-destructive methods for material testing and diagnostics has been, in the last few decades, focused mainly on optical, infrared, thermography, ultrasonic, acoustic or X-ray principles. This article deals with the possibility of adaptation of magnetic sensors for the diagnostics of aircraft structures. The developed sensors are based on the enhanced induction method, allowing contactless diagnostics of the material structure. In the role of the sensing element, amorphous magnetic microwires were used. Thanks to their dimensions, microwires can either be placed on the material surface or be embedded directly into the composite material without structural violations. In the article, the measurement principles of the developed microwire-based tensile stress sensors, together with the experimental measurements with the sensors originally tested in the aircraft wing, are presented.

SOME ASPECTS OF NON-DESTRUCTIVE TESTING OF EQUIPMENT AND PIPELINES OF NUCLEAR POWER PLANTS

2021 ◽  
pp. 20-26
Author(s):  
V. M. Ushakov
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Energy Agency ◽  
Safety Standards ◽  
Equipment And Pipelines ◽  
Non Destructive

Topical aspects of non-destructive testing (NDT) of equipment and pipelines of power units of nuclear power plants (NPP) are considered. Non-destructive testing is an integral part of the entire life cycle of a nuclear power plant. Briefly analyzed documentation and types of non-destructive testing at the stage of manufacturing equipment and pipelines. Power of ultrasonic testing of welded joints of pipelines with a thickness of 2 to 6 mm. The main points of drawing up technological maps of non-destructive testing are noted. A brief analysis of the application of non-destructive testing in accordance with the requirements of the regulatory documents of the Russian Federation and the safety standards of the International Atomic Energy Agency is provided. It is shown that in recent years there has been a tendency to expand the role of NDTs from the classical approach of detecting and assessing defects to the use of NDTs in the study of metal degradation and ageing processes during the operation of NPP equipment and pipelines.

scholarly journals Acoustic Emission

2021 ◽  
pp. 175-217
Author(s):  
Dimitrios G. Aggelis ◽  
Markus G. R. Sause ◽  
Pawel Packo ◽  
Rhys Pullin ◽  
Steve Grigg ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Health Monitoring ◽  
Crack Nucleation ◽  
Irreversible Processes ◽  
Destructive Testing ◽  
Research And Practice ◽  
Non Invasive ◽  
Recent Trends ◽  
Non Destructive

AbstractAcoustic emission (AE) is one of the most promising methods for structural health monitoring (SHM) of materials and structures. Because of its passive and non-invasive nature, it can be used during the operation of a structure and supply information that cannot be collected in real time through other techniques. It is based on the recording and study of the elastic waves that are excited by irreversible processes, such as crack nucleation and propagation. These signals are sensed by transducers and are transformed into electric waveforms that offer information on the location and the type of the source. This chapter intends to present the basic principles, the equipment, and the recent trends and applications in aeronautics, highlighting the role of AE in modern non-destructive testing and SHM. The literature in the field is vast; therefore, although the included references provide an idea of the basics and the contemporary interest and level of research and practice, they are just a fraction of the total possible list of worthy studies published in the recent years.

Active Thermografy as a Method for Non-destructive Testing of Polymer Composite Materials

2021 ◽  
Vol 16 (2) ◽  
pp. 5-9
Author(s):  
Eva Popardovská ◽  
◽  
Vladimír Popardovský ◽  
Keyword(s):  
Composite Materials ◽  
Real Time ◽  
Material Surface ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Testing Methods ◽  
Destructive Testing ◽  
Thermal Fields ◽  
Active Thermography ◽  
Non Destructive

Infrared (IR) thermography is a method for imaging thermal fields on the target surfaces in real time. It is a noncontact and non-destructive method of obtaining thermogram of tested material surface or inside of it. We can divide the IR thermographic testing methods into two basic groups – passive and active thermography. This article introduces a basic overview of IR active thermography.

Assessment of Historic Structures Based on GPR, Ultrasound, and Impact-Echo Data Fusion

2013 ◽  
Vol 569-570 ◽  
pp. 1210-1217
Author(s):  
Gonzalo Safont ◽  
Addisson Salazar ◽  
Luis Vergara ◽  
Antonio Vidal ◽  
Alberto Gonzalez
Keyword(s):  
Ground Penetrating Radar ◽  
Material Structure ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Impact Echo ◽  
Feature Processing ◽  
Scale Models ◽  
Historic Structures ◽  
Ground Penetrating ◽  
Non Destructive

This paper presents a method for assessment of historic structures based on the fusion of data from ground-penetrating radar (GPR), ultrasound, and impact-echo testing. The method consists of the following steps: measuring, feature extraction, fusion, representation, and evaluation. The employed techniques for an application in scale models of historical walls are described. Thus, experimental deployment; signal feature processing; fusion operators (including order statistics digital filters); 2D non-destructive testing images, and figures of merits of the fused results are explained in detail. The deformation of different imperfections in the material structure related to the application of weight load increments applied on the wall is analyzed by using different kinds of fusion configurations.

scholarly journals In Situ, Non-Destructive Testing for Evaluating the Role of Pointing Mortar in Preventive Conservation Strategies. A Case-Study on Reigate Stone at the Wardrobe Tower, Tower of London

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 345
Author(s):  
Martin Michette ◽  
Heather Viles ◽  
Constantina Vlachou ◽  
Ian Angus
Keyword(s):  
Conservation Strategies ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Tower Of London ◽  
Hydraulic Lime ◽  
Historic Masonry ◽  
Lime Mortars ◽  
Non Destructive

The correct choice of pointing mortar is considered crucial to the conservation of historic masonry. A proliferation of cement and eminently hydraulic lime mortars since the late 19th century has accelerated the deterioration of built cultural heritage in many parts of the world. Whilst the use of softer, lime-based mortars in stone conservation is now common practice, their role in the overall conservation strategy of highly vulnerable building stones such as Reigate Stone requires assessment. In this paper non-destructive testing (NDT) is used across a two-year period to investigate the impact of different pointing mortar types in situ. NDT data on surface hardness and moisture are interpreted at different scales to assess moisture regulation of Reigate Stone masonry at the Wardrobe Tower, a ruined structure at the Tower of London, following repointing carried out in Spring 2017. Joints repointed using a hydraulic lime mortar (NHL3.5) are shown to regulate moisture in adjacent Reigate Stone blocks less well than those repointed using a lime putty mortar. However, despite an initially inappropriate recipe, older hydraulic lime mortars are in some instances shown to perform similarly to the lime putty mortar, suggesting that NHL can weather sympathetically. The results also indicate that, whilst pointing mortar type does play a role in the moisture regulation of individual stones, its effect is outweighed by both properties of the stone itself, such as strength and past decay, and by wider micro-contextual factors, such as exposure or adjacent topography. Findings from the Wardrobe Tower indicate that pointing mortar only plays a part in overall moisture regulation; to enable its effective functioning and minimise the need for repeated interventions, it may be necessary to take additional protective measures to mitigate moisture ingress, such as water run-off and channelling following heavy rainfall. The overall implication is that in vulnerable historic masonry such as Reigate Stone, sustainable conservation strategies must incorporate a broad appraisal of, and tailored response to, specific decay mechanisms. With careful calibration across repeated survey campaigns, data collected in situ using NDT can inform the role of pointing mortar within such strategies.

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