scholarly journals On the Thickness Quantification of Composite Materials by Using Lock-In Thermography

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1185
Author(s):  
Davide Palumbo
Keyword(s):  
Composite Materials ◽  
Measurement Accuracy ◽  
Plastic Material ◽  
Thickness Measurement ◽  
Glass Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic ◽  
Test Parameters ◽  
Lock In ◽  
Non Destructive

Many structural components made of composite materials need an accurate thickness control during fabrication and/or maintenance. In this regard, various non-destructive techniques can be used for the online measuring of thickness of large components such as wings and fuselage in the aerospace industry. In this work, the capabilities of lock-in thermography technique in thickness measurement of glass fiber reinforced plastic material were investigated and a correct procedure has been proposed to ensure the best measurement accuracy. An analytical approach and several tests were carried out on a sample specimen with the aim to study the main test parameters. Finally, the limits of technique have been discussed.

Detection of Delamination in GFRP and CFRP by Microwaves with Focusing Mirror Sensor

2013 ◽  
Vol 750 ◽  
pp. 142-146 ◽  
Author(s):  
Atsushi Hosoi ◽  
Yuhei Yamaguchi ◽  
Yang Ju ◽  
Yasumoto Sato ◽  
Tsunaji Kitayama
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
High Sensitivity ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Plastic ◽  
Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic

A technique to detect delamination in composite materials by noncontact, rapid and high sensitive microwave reflectometry with a focusing mirror sensor was proposed. The focusing mirror sensor, which has high sensitivity and resolution, is expected to detect delamination sensitively. In this paper, the ability of microwave inspection to detect delamination in glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP) was verified. As the results, the existences of 100 μm thick delamination in 3 mm thick GFRP laminate and 2 mm thick CFRP laminate were detected.

Online Monitoring of Drilling-Induced Delamination of Composite Materials by Acoustic Emission

2012 ◽  
Author(s):  
Navid Zarif Karimi ◽  
Hossein Heidary ◽  
Mehdi Ahmadi Najafabadi ◽  
Parnian Kianfar ◽  
Giangiacomo Minak ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Composite Materials ◽  
Thrust Force ◽  
Drilling Process ◽  
Glass Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic ◽  
On Line ◽  
Best Parameter ◽  
Drilling Conditions

Drilling composite materials is one of the primary processes of manufacturing industrial structures. The ultimate goal towards on-line monitoring of composites drilling is in order to produce damage free high quality drilled holes. In the present investigation, the acoustic emission (AE) technique was applied for monitoring the drilling-induced delamination. Delamination is major damage mechanisms in glass fiber reinforced plastic (GFRP) laminates correlated with the thrust force during drilling process. By feature extraction of AE time domain, root mean square (RMS) is selected as the best parameter to monitor thrust force variations. The experimental results show that AE is very sensitive to the response of the drilling conditions.

scholarly journals Temperature and thrust force analysis on drilling of Glass fiber reinforced plastics

2019 ◽  
Vol 23 (1) ◽  
pp. 347-352 ◽  
Author(s):  
Engin Unal
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
Thrust Force ◽  
Fiber Reinforced ◽  
Force Analysis ◽  
Glass Fiber Reinforced Plastic ◽  
Fiber Reinforced Plastic ◽  
Plastic Composite ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic

Composite materials are widely used today in many sectors. Glass fiber reinforced plastic composite materials are one of those. Glass fiber reinforced plastic composite materials are preferred due to their high thermal and tensile strength. Although consist of glass fiber reinforced composite materials from multiple layers reduces the machinability of these materials, drilling is a common method of machining for these materials. However, when the drilling parameters are not carefully selected, the material integrity is deteriorated and the desired drilling quality cannot be obtained. In this study, the effect of drilling temperature and thrust force on the material integrity was investigated. The drill bit angle, spindle speed and feedrate parameters are used for the temperature and thrust force analysis.

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