Non destructive evaluation of artificially induced damage in composite structures using electrical resistance/potential mapping

2012 ◽  
pp. 381-387
Author(s):  
Andreas Ampatzoglou ◽  
Antonis Vavouliotis ◽  
Athanasios Baltopoulos ◽  
Vassilis Kostopoulos
Keyword(s):  
Electrical Resistance ◽  
Composite Structures ◽  
Non Destructive Evaluation ◽  
Potential Mapping ◽  
Non Destructive

scholarly journals A Review of Sensing Technologies for Non-Destructive Evaluation of Structural Composite Materials

2021 ◽  
Vol 5 (12) ◽  
pp. 319
Author(s):  
Ranjeetkumar Gupta ◽  
Daniel Mitchell ◽  
Jamie Blanche ◽  
Sam Harper ◽  
Wenshuo Tang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Image Correlation ◽  
Structural Composites ◽  
Comprehensive Review ◽  
Contact Type ◽  
Significant Challenge ◽  
Non Destructive Evaluation ◽  
The Future ◽  
Non Destructive

The growing demand and diversity in the application of industrial composites and the current inability of present non-destructive evaluation (NDE) methods to perform detailed inspection of these composites has motivated this comprehensive review of sensing technologies. NDE has the potential to be a versatile tool for maintaining composite structures deployed in hazardous and inaccessible areas, such as offshore wind farms and nuclear power plants. Therefore, the future composite solutions need to take into consideration the niche requirements of these high-value/critical applications. Composite materials are intrinsically complex due to their anisotropic and non-homogeneous characteristics. This presents a significant challenge for evaluation and the associated data analysis for NDEs. For example, the quality assurance, certification of composite structures, and early detection of the failure is complex due to the variability and tolerances involved in the composite manufacturing. Adapting existing NDE methods to detect and locate the defects at multiple length scales in the complex materials represents a significant challenge, resulting in a delayed and incorrect diagnosis of the structural health. This paper presents a comprehensive review of the NDE techniques, that includes a detailed discussion of their working principles, setup, advantages, limitations, and usage level for the structural composites. A comparison between these techniques is also presented, providing an insight into the future trends for composites’ prognostic and health management (PHM). Current research trends show the emergence of the non-contact-type NDE (including digital image correlation, infrared tomography, as well as disruptive frequency-modulated continuous wave techniques) for structural composites, and the reasons for their choice over the most popular contact-type (ultrasonic, acoustic, and piezoelectric testing) NDE methods is also discussed. The analysis of this new sensing modality for composites’ is presented within the context of the state-of-the-art and projected future requirements.

Non-Destructive Evaluation of Composite Laminates by Using Fiber Optic AE Sensor

2012 ◽  
Vol 204-208 ◽  
pp. 3965-3969
Author(s):  
Jun Cai Hao ◽  
Jin Wang ◽  
Yue Min Yu
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Composite Structures ◽  
Fiber Optic ◽  
Fiber Composite ◽  
Matrix Cracking ◽  
Fiber Optic Sensor ◽  
Carbon Fiber Composite ◽  
Non Destructive Evaluation ◽  
Non Destructive

Considering the damage that composite material under loading may occur, acoustic emission (AE) technique is adopted to perform non-destructive evaluation (NDE). In order to obtain the acoustic emission emitted from the composite material, a novel fiber optic AE sensor which is based on single mode fiber optical fused-tapered coupler design is developed. Futhermore, its fabrication process was described and performance was studied. Results of a pencil break test on the composite laminate show that the fiber optic AE sensor have better frequency response than the commercial piezoelectric sensor. During a tension experiment of a carbon fiber composite specimen , the fiber optic sensor which was mounted on it detected the enormous acoustic emission signals. To analyze their characteristic parameter, such as amplitude, duration, can identify the type of failure to composite materials, including Matrix cracking , Interface stripping, fiber breakage. Experimental results would offer the reference to damage identification to complicate composite structures.

Non-Destructive Testing of Thermoplastic Carbon Composite Structures

2020 ◽  
Vol 2020 (1) ◽  
pp. 34-52
Author(s):  
Rafał Szymański
Keyword(s):  
Composite Structures ◽  
Ultrasonic Method ◽  
Composite Panel ◽  
Aviation Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulse Technique ◽  
Thermoplastic Matrix ◽  
The Subject ◽  
Non Destructive

AbstractThe article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon preimpregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn.

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