On the Correlation between Acoustic Emission and Progression of Matrix Splitting in a Unidirectional Graphite/Epoxy Composite

2009 ◽  
pp. 404-404-12 ◽  
Author(s):  
S Ghaffari ◽  
J Awerbuch
Keyword(s):  
Acoustic Emission ◽  
Epoxy Composite ◽  
Matrix Splitting

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.

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.

Fiber-Optic Interferometric Sensor Based on the Self-Interference Pulse Interrogation Approach for Acoustic Emission Sensing in the Graphite/Epoxy Composite

2019 ◽  
Vol 19 (18) ◽  
pp. 7861-7867 ◽  
Author(s):  
Mikhail E. Efimov ◽  
Mikhail Y. Plotnikov ◽  
Andrey V. Kulikov ◽  
Mikhail V. Mekhrengin ◽  
Aleksandr Y. Kireenkov
Keyword(s):  
Acoustic Emission ◽  
Fiber Optic ◽  
Epoxy Composite ◽  
The Self ◽  
Acoustic Emission Sensing ◽  
Interferometric Sensor

Some Observations on Acoustic Emission during Continuous Tensile Cycling of a Carbon Fibre/Epoxy Composite

1972 ◽  
Vol 237 (74) ◽  
pp. 78-80 ◽  
Author(s):  
H. C. KIM ◽  
A. P. RIPPER NETO ◽  
R. W. B. STEPHENS
Keyword(s):  
Acoustic Emission ◽  
Carbon Fibre ◽  
Epoxy Composite

Acoustic emission characterization of local bending behavior for adhesively bonded hybrid external patch repaired glass/epoxy composite laminates

2018 ◽  
Vol 18 (3) ◽  
pp. 739-756 ◽  
Author(s):  
J Jefferson Andrew ◽  
V Arumugam ◽  
C Ramesh
Keyword(s):  
Acoustic Emission ◽  
Composite Laminates ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Glass Fibers ◽  
Residual Deformation ◽  
Woven Fabrics ◽  
Adhesively Bonded ◽  
Indentation Tests ◽  
Bending Response

This article investigates the influence of homogeneous and hybrid external patches based on glass and Kevlar plain weave woven fabrics on local bending response of adhesively bonded external patch repairs in damaged glass/epoxy composite laminates. The intent of using hybrid external patches was to combine the excellent high displacement to failure property of Kevlar fiber as a ductile reinforcement with the superior mechanical property of glass fiber as a brittle reinforcement. The undamaged normal specimens were taken as the standard specimen for evaluation of residual mechanical properties. In all hybrid patches, the proportion of Kevlar and glass fibers was equal (i.e. 50% of Kevlar and 50% of glass by volume fraction), while lay-up configurations were different. This further allowed studying the associated effects of hybridization and lay-up configuration on local bending response of the repaired laminates. All the specimens were subjected to cyclic quasi-static indentation tests with a step loading method. The indentation tests have also been monitored in real time by acoustic emission system. The acoustic emission results illustrated various damage profiles and correlates with the mechanical test results to point out the load to a transformation in damage mechanisms during indentation loading with respect to the effect of each patch material on the performance of the repaired glass/epoxy specimens. Results showed that hybridization and lay-up configurations of the external patches played a significant role on local bending response (i.e. ultimate load, stiffness, residual deformation, displacement to failure, and damage pattern) of the repaired glass/epoxy specimens. Specimens repaired using intra-ply hybrid patches showed the best local bending response.

Reliability of damage mechanism localisation by acoustic emission on glass/epoxy composite material plate

2012 ◽  
Vol 94 (5) ◽  
pp. 1483-1494 ◽  
Author(s):  
Salah-Eddine Mechraoui ◽  
Abdelouahed Laksimi ◽  
Salim Benmedakhene
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Epoxy Composite ◽  
Damage Mechanism
Sign in / Sign up

Export Citation Format

Share Document