scholarly journals Electrical Resistance Change of Carbon/Epoxy Composite Laminates under Cyclic Loading under Damage Initiation Limit

2014 ◽  
Vol 04 (01) ◽  
pp. 22-31 ◽  
Author(s):  
Akira Todoroki ◽  
Daichi Haruyama ◽  
Yoshihiro Mizutani ◽  
Yoshiro Suzuki ◽  
Tesuo Yasuoka
Keyword(s):  
Cyclic Loading ◽  
Electrical Resistance ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Resistance Change ◽  
Damage Initiation ◽  
Electrical Resistance Change

Damage Characterization in Glass/Epoxy Composite Laminates under Normal and Oblique Planes of Cyclic Indentation Loading with AE Monitoring

2021 ◽  
Vol 79 (1) ◽  
pp. 61-77
Author(s):  
A Jayababu ◽  
V Arumugam ◽  
B Rajesh ◽  
C Suresh Kumar
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Cyclic Loading ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Damage Resistance ◽  
Damage Initiation ◽  
Residual Compressive Strength ◽  
Cyclic Indentation ◽  
Indentation Damage

This work focuses on the experimental investigation of indentation damage resistance in different stacking sequences of glass/epoxy composite laminates under cyclic loading on normal (0°) and oblique (20°) planes. The stacking sequence, such as unidirectional [0]12, angle ply [±45]6S, and cross ply [0/90]6S, were subjected to cyclic indentation loading and monitoring by acoustic emission testing (AE). The laminates were loaded at the center using a hemispherical steel indenter with a 12.7 mm diameter. The cyclic indentation loading was performed at displacements from 0.5 to 3 mm with an increment of 0.5 mm in each cycle. Subsequently, the residual compressive strength of the post-indented laminates was estimated by testing them under in-plane loading, once again with AE monitoring. Mechanical responses such as peak load, absorbed energy, stiffness, residual dent, and damage area were used for the quantification of the indentation-induced damage. The normalized AE cumulative counts, AE energy, and Felicity ratio were used for monitoring the damage initiation and propagation. Moreover, the discrete wavelet analysis of acoustic emission signals and fast Fourier transform enabled the calculation of the peak frequency content of each damage mechanism. The results showed that the cross-ply laminates had superior indentation damage resistance over angle ply and unidirectional (UD) laminates under normal and oblique planes of cyclic loading. However, the conclusion from the results was that UD laminates showed a better reduction in residual compressive strength than the other laminate configurations.

Cyclic Behavior of Electrical Resistance Type Low Stiffness, Large Strain Sensor by Using Carbon Nanofiber/Flexible Epoxy Composite

2011 ◽  
Vol 462-463 ◽  
pp. 1200-1205 ◽  
Author(s):  
Yoshinobu Shimamura ◽  
Kyohei Kageyama ◽  
Keiichiro Tohgo ◽  
Tomoyuki Fujii
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistance ◽  
Carbon Nanofiber ◽  
Epoxy Composite ◽  
Large Strain ◽  
Conductive Polymer ◽  
Cyclic Behavior ◽  
Resistance Change ◽  
Sensing Applications ◽  
Electrical Resistance Change

Carbon nanofiber (CNF) has good electrical conductivity. Addition of a few percentages of carbon nanofiber to polymer yields electrical conductivity but hardly affects the mechanical properties of polymer. This conductive polymer may be useful for sensing applications such as strain sensors and chem-resist sensors. Many researchers have reported on the electrical conductivity, but the electrical resistance change under strain of the carbon nanofiller composites is not fully investigated. In this study, the electrical resistance change under strain of CNF/flexible-epoxy composites was investigated experimentally. More than 100% of quasi-static strain can be measured by using CNF/flexible-epoxy composite with Young’s modulus of less than 1MPa. Cyclic and unloading behaviors were also measured and discussed. It was found that the cyclic behavior was strongly affected by viscoelasticity and damage.

PS31 Electrical resistance change of CFRP laminates under cyclic loading

2012 ◽  
Vol 2012 (0) ◽  
pp. _PS31-1_-_PS31-3_
Author(s):  
Daichi HARUYAMA ◽  
Akira TODOROKI ◽  
Yoshihiro MIZUTANI ◽  
Yoshiro SUZUKI
Keyword(s):  
Cyclic Loading ◽  
Electrical Resistance ◽  
Resistance Change ◽  
Cfrp Laminates ◽  
Electrical Resistance Change

Electrical Resistance Change under Strain of CNF/Flexible-Epoxy Composite

2010 ◽  
Vol 19 (2) ◽  
pp. 123-138 ◽  
Author(s):  
Tetsuo Yasuoka ◽  
Yoshinobu Shimamura ◽  
Akira Todoroki
Keyword(s):  
Electrical Resistance ◽  
Epoxy Composite ◽  
Resistance Change ◽  
Electrical Resistance Change
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