A New Fuzzy Geometrical Approach to Classify Defects in Composite Materials

2012 ◽  
Vol 2 (4) ◽  
pp. 12-20
Author(s):  
Matteo Cacciola ◽  
Salvatore Calcagno ◽  
Fabio La Foresta ◽  
Mario Versaci
Keyword(s):  
Point Of View ◽  
Geometrical Approach ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Fuzzy Distance ◽  
Reinforced Polymer ◽  
Heuristic Technique ◽  
Non Destructive

It is well known that in the Non Destructive Testing/Evaluation (NDT/E) context, Ultrasonic Echoes (UEs) and Tests (UTs) are intensively exploited to identify and characterize defects in the Carbon Fiber Reinforced Polymer (CFRP). This paper examines the localization and the classification of defects in this material from a fuzzy geometrical point of view. In particular, starting from an experimental campaign of measurements carried out in our Lab (Laboratory of Electrical Engineering & Non-Destructive Tests and Evaluations, “Mediterranea” University of Reggio Calabria), fuzzy subsethood calculus is taken into account to translate the characterization of a defect in CFRP into a sort of “fuzzy distance” among UEs. Finally, the floor is open for any questions related to the comparison with a higher computational complexity heuristic technique.

Non-destructive testing of fiber reinforced polymer rebars

2020 ◽  
pp. 23-35
Author(s):  
Andrey Buchkin ◽  
◽  
Valentina Stepanova ◽  
Victor Strizhak ◽  
Evgeny Yurin ◽  
...  
Keyword(s):  
Fiber Reinforced Polymer ◽  
Non Destructive Testing ◽  
Fiber Reinforced ◽  
Destructive Testing ◽  
Reinforced Polymer ◽  
Non Destructive

Application of Gradient Based IR Thermography to the GRP Structures Inspection

2011 ◽  
Vol 488-489 ◽  
pp. 682-685 ◽  
Author(s):  
Lovre Krstulović-Opara ◽  
Endri Garafulić ◽  
Branko Klarin ◽  
Željko Domazet
Keyword(s):  
Pulse Heating ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Destructive Testing ◽  
Heat Flows ◽  
Testing Method ◽  
Reinforced Polymer ◽  
Gradient Based ◽  
Non Destructive ◽  
Gradient Approach

The article presents application of non destructive testing method based on the pulse heating infrared thermography used to detect material anomalies for the case of glass reinforced polymer structures. The goal of presented research, based on the thermal gradient approach, is to establish the procedure capable of filtering out anomalies from other thermal influences caused by thermal reflections of surrounding objects, geometry influences and heat flows for observed object.

METHODS OF ACOUSTIC EMISSION ESTIMATION OF NANO-CHARACTERISTICS OF THE STRENGTH OF STRUCTURAL AND ENGINEERING MATERIALS OF THE OBJECTS

2019 ◽  
pp. 44-57 ◽  
Author(s):  
V. V. Nosov ◽  
E. V. Grigoriev
Keyword(s):  
Acoustic Emission ◽  
Multilevel Model ◽  
Point Of View ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Kaiser Effect ◽  
Operational Level ◽  
Real Objects ◽  
Emission Estimation ◽  
Non Destructive

The acoustic emission method is the most promising metrological basis for non-destructive testing of strength. The necessity of solving problems of acoustic emission prediction of fracture and the ambiguity of the connection of the results of acoustic emission tests makes the problem of modeling strength heterogeneity relevant; it suggests a transition to a more complex level of research. The complexity of predicting the behavior of heterogeneous materials necessitates modeling and determining the parameters of the fracture process at the nano-defining operational level and the need to interpret the Kaiser effect revealing the strength heterogeneity as a phenomenon of a decrease in the activity of elastic radiation upon application of repetitive loads on the object under control. Heterogeneity modeling requires determining of its type, criterion and approach to estimation. The type of heterogeneity depends on the solved problem and has to be associated with the property that determines the function of real objects. Also, the criterion should be informative and the method of its evaluation should be non-destructive. Examples of modeling the temporal dependences of the AE parameters under conditions of strength heterogeneity are given, the analysis is carried out and the Kaiser effect is estimated from the point of view of a multilevel model of the dependences of the temporal parameters of acoustic emission.

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