scholarly journals Advanced ultrasonic testing of complex shaped composite structures

2016 ◽  
Vol 135 ◽  
pp. 012010 ◽  
Author(s):  
D Dolmatov ◽  
V Zhvyrblya ◽  
G Filippov ◽  
Y Salchak ◽  
E Sedanova
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures

scholarly journals Smart numerical tools for the modelling of ultrasonic testing on curved composite structures

2019 ◽  
Author(s):  
Alexandre Imperiale ◽  
Edouard Demaldent ◽  
Nicolas Leymarie ◽  
Sylvain Chatillon ◽  
Pierre Calmon
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures ◽  
Numerical Tools

scholarly journals Evaluation of Impact Damage in Composite Structures Using Ultrasonic Testing

2018 ◽  
Vol 2018 (10) ◽  
pp. 82-92 ◽  
Author(s):  
Angelika Wronkowicz-Katunin ◽  
Krzysztof Dragan
Keyword(s):  
Image Processing ◽  
Image Analysis ◽  
Impact Energy ◽  
Ultrasonic Testing ◽  
Composite Structures ◽  
Impact Damage ◽  
Visual Observation ◽  
Effective Evaluation ◽  
Wide Range ◽  
Variable Impact

Abstract Barely visible impact damage is one of the problems commonly occurring in composite elements during an aircraft operation. The authors described the mechanisms of impact damage formation and propagation in composite structures. The paper presents a performed analysis of an influence of impact parameters on the resulting damage, i.e. its detectability by means of visual observation as well as its extent determined based on ultrasonic tests results. The tests were conducted on the CFRP specimens with a wide range of impact damage cases obtained with combinations of variable impact energy and shapes of impactors. Additionally, an algorithm based on image processing and image analysis methods is proposed for the purpose of the effective evaluation of the ultrasonic data obtained.

scholarly journals Impact Damage Evaluation in Composite Structures Based on Fusion of Results of Ultrasonic Testing and X-ray Computed Tomography

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1867 ◽  
Author(s):  
Andrzej Katunin ◽  
Angelika Wronkowicz-Katunin ◽  
Krzysztof Dragan
Keyword(s):  
Computed Tomography ◽  
Ultrasonic Testing ◽  
Composite Structures ◽  
Structural Damage ◽  
Impact Damage ◽  
Estimation Accuracy ◽  
Fracture Mechanisms ◽  
Internal Damage ◽  
X Ray ◽  
X Ray Computed

Barely visible impact damage (BVID) is one of the most dangerous types of structural damage in composites, since in most practical cases the application of advanced non-destructive testing (NDT) methods is required to detect and identify it. Due to its character of propagation, there are minor signs of structural damage on a surface, while the internal damage can be broad and complex both in the point of view of fracture mechanisms and resulting geometry of damage. The most common NDT method applied e.g., in aircraft inspections is ultrasonic testing (UT), which enables effective damage detection and localization in various environments. However, the results of such inspections are usually misestimated with respect to the true damage extent, and the quantitative analysis is biased by an error. In order to determine the estimation error a comparative analysis was performed on NDT results obtained for artificially damaged carbon fiber-reinforced composite structures using two UT methods and X-ray computed tomography (CT). The latter method was considered here as the reference one, since it gives the best spatial resolution and estimation accuracy of internal damage among the available NDT methods. Fusing the NDT results for a set of pre-damaged composite structures with various energy values of impact and various types of impactor tips applied for introducing damage, the evaluation of estimation accuracy of UT was possible. The performed analysis allowed for evaluation of relations between UT and X-ray CT NDT results and for proposal of a correcting factor for UT results for BVID in the analyzed composite structures.

Assessment of uncertainty in damage evaluation by ultrasonic testing of composite structures

2018 ◽  
Vol 203 ◽  
pp. 71-84 ◽  
Author(s):  
Angelika Wronkowicz ◽  
Krzysztof Dragan ◽  
Krzysztof Lis
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures ◽  
Damage Evaluation

Air-Coupled Ultrasound: A New Paradigm in NDE

2007 ◽  
Author(s):  
Vinay Dayal ◽  
David K. Hsu ◽  
Adam H. Kite
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures ◽  
Low Frequency ◽  
New Paradigm ◽  
Very Low Frequency ◽  
Ultrasonic Investigation

In any ultrasonic investigation, the contact between the transducer and the object has always been a source of problem. With the introduction of the air-coupled ultrasonic probes the couplant is totally eliminated. The limitation of these probes is that they are of very low frequency and as a result they bring their set of restrictions. We present here a couple of results of our investigations of composite structures with air-coupled transducers. The resonance of structures is an important factor which is able to explain observations of air-coupled ultrasonic testing.

Resonance Bond Testing: Theory and Application

2021 ◽  
Vol 79 (6) ◽  
pp. 512-519
Author(s):  
Stetson Watkins ◽  
James Bittner
Keyword(s):  
Composite Materials ◽  
Ultrasonic Testing ◽  
Composite Structures ◽  
Sound Waves ◽  
Metallic Structures ◽  
Cfrp Laminates ◽  
Reinforced Plastics ◽  
Load Paths ◽  
Increased Strength ◽  
Skin To Skin

Resonance bond testing is a nondestructive testing (NDT) technique that is used to detect disbonds, delaminations, and other voids in composite materials. The aerospace industry has seen an increase in the use of carbon fiber reinforced plastics (CFRP) for aircraft and spacecraft construction. Composite materials offer many advantages over traditional metallic structures, which include weight savings, increased strength, design for specific load paths, and the ability to easily construct geometrically complex structures. Resonance bond testing has many established uses for metallic structures as well, such as aluminum skin-to-skin and skin-to-core bonds. This bond testing technique has been around for many decades but is used by only a small portion of the NDT community. Ultrasonic testing (UT), specifically phased array ultrasonic testing (PAUT), using linear array techniques has proven to be a reliable method for the inspection of CFRP laminates. When composite structures do not permit the use of high-frequency sound waves due to rapid attenuation, resonance bond testing is a proven alternative. In this paper, the authors will discuss the theory behind resonance bond testing and how it has and continues to play an important role in the NDT industry.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

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