Damage Observation of Glass Fiber/Epoxy Composites Using Thermography and Supported by Acoustic Emission

2014 ◽  
Vol 627 ◽  
pp. 187-190 ◽  
Author(s):  
Jefri Bale ◽  
Emmanuel Valot ◽  
Martine Monin ◽  
Peggy Laloue ◽  
Olivier Polit ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Glass Fiber ◽  
Epoxy Composite ◽  
Thermal Response ◽  
Tensile Loading ◽  
Destructive Testing ◽  
Ir Camera ◽  
Damage Propagation ◽  
Static Tensile Loading ◽  
Static Tensile

This work presents an experimental study to monitor the damage propagation of composite material by non destructive testing (NDT) method. In order to achieve this, an open hole condition of glass fiber/epoxy composite has been used as the specimen test under static tensile loading and observed using two different real-time monitoring techniques of NDT namely infra-red (IR) camera and supported by Acoustic Emission. The results show that the thermal response and acoustic emission signals give a good detection on damage appearance and damage propagation of glass fiber/epoxy composite under static tensile loading conditions.

scholarly journals Acoustic emission monitoring of thin ply hybrid composites under repeated quasi-static tensile loading

2018 ◽  
Vol 46 (3) ◽  
pp. 238-244 ◽  
Author(s):  
Mohamad Fotouhi ◽  
Putu Suwarta ◽  
Meisam Jalalvand ◽  
Gergely Czél ◽  
Michael Wisnom
Keyword(s):  
Acoustic Emission ◽  
Hybrid Composites ◽  
Tensile Loading ◽  
Acoustic Emission Monitoring ◽  
Emission Monitoring ◽  
Static Tensile Loading ◽  
Static Tensile

Electro-mechanical studies of multi-functional glass fiber/epoxy reinforced composites

2019 ◽  
Vol 38 (11) ◽  
pp. 506-520 ◽  
Author(s):  
Jacob O’Donnell ◽  
Vijaya Chalivendra ◽  
Asha Hall ◽  
Mulugeta Haile ◽  
Latha Nataraj ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Carbon Fibers ◽  
Epoxy Matrix ◽  
Mechanical Response ◽  
Laminated Composites ◽  
Tensile Loading ◽  
Static Tensile Loading ◽  
Static Tensile

An experimental study is performed to investigate the electro-mechanical response of three-dimensionally conductive multi-functional glass fiber/epoxy laminated composites under quasi-static tensile loading. To generate a three-dimensional conductive network within the composites, multi-wall carbon nanotubes are embedded within the epoxy matrix and carbon fibers are reinforced between the glass fiber laminates using an electro-flocking technique. A combination of shear mixing and ultrasonication is employed to disperse carbon nanotubes inside the epoxy matrix. A vacuum infusion process is used to fabricate the laminated composites of two different carbon fiber lengths (150 µm and 350 µm) and four different carbon fiber densities (500, 1000, 1500, 2000 fibers/mm2). A four circumferential probe technique is employed to measure the in-situ electrical resistance of composites under tensile load. Although composites of both carbon fiber lengths showed significant decrease of sheet resistance under no mechanical load conditions, composites of 350 µm long carbon fibers showed the lowest resistivity of 10 Ω/sq. Unlike the resistance values, composites of 350 µm carbon fibers showed a significant decrease in Young’s modulus compared to 150 µm counterparts. For the electro-mechanical response, composites containing carbon fibers of 150 µm long demonstrated a maximum value of percentage change in resistance. These results were then compared to both 350 µm and no added carbon fibers under quasi-static tensile loading.

Cluster analysis of acoustic emission signals and tensile properties of carbon/glass fiber–reinforced hybrid composites

2019 ◽  
Vol 18 (5-6) ◽  
pp. 1686-1697 ◽  
Author(s):  
Wen-zheng Zhao ◽  
Wei Zhou
Keyword(s):  
Acoustic Emission ◽  
Digital Image Correlation ◽  
Glass Fiber ◽  
Digital Image ◽  
Hybrid Composites ◽  
Correlation Method ◽  
Tensile Loading ◽  
Image Correlation ◽  
Matrix Cracking ◽  
Woven Composites

Understanding the damage and failure of carbon/glass epoxy hybrid woven composites under tensile loading based on acoustic emission signals is a challenging task in their practical uses. In this study, an approach based on fuzzy c-means algorithm is proposed to process the acoustic emission signals from tensile loading of composites monitored by combining acoustic emission technology and digital image correlation method. The results show that the acoustic emission signals from tensile loading can be divided into three clusters. The three clusters correspond to three kinds of damage modes including matrix cracking, fiber/matrix debonding, delamination, and fiber breakage. By comparing the acoustic characteristics of these classes, a correlation procedure between the clusters and the damage mechanisms observed is proposed. Meanwhile, it can be found that debonding and fiber break signals for glass fiber correspond to a lower frequency range than that for carbon fiber. Moreover, the method combining acoustic emission and digital image correlation can effectively monitor the damage process of the specimen both on the inside and outside, which can provide a reference for the health monitoring of composite structure.

2143 Study on damage development for braided composites under static tensile loading

2007 ◽  
Vol 2007.1 (0) ◽  
pp. 223-224
Author(s):  
Kenta Hamada ◽  
Tetsusei KURASHIKI ◽  
Hiroaki NAKAI ◽  
Masaru ZAKO
Keyword(s):  
Tensile Loading ◽  
Braided Composites ◽  
Damage Development ◽  
Static Tensile Loading ◽  
Static Tensile
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