Damage Categorization of Glass/Epoxy Composite Material Under Mode II Delamination Using Acoustic Emission Data: A Clustering Approach to Elucidate Wavelet Transformation Analysis

2013 ◽  
Vol 39 (2) ◽  
pp. 1325-1335 ◽  
Author(s):  
J. Yousefi ◽  
M. Ahmadi ◽  
M. Nazmdar Shahri ◽  
A. Refahi Oskouei ◽  
F. Jalali Moghadas
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Wavelet Transformation ◽  
Epoxy Composite ◽  
Mode Ii ◽  
Emission Data ◽  
Clustering Approach

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

Identification of Failure Modes in Composites from Clustered Acoustic Emission Data Using Pattern Recognition and Wavelet Transformation

2012 ◽  
Vol 38 (5) ◽  
pp. 1087-1102 ◽  
Author(s):  
V. Arumugam ◽  
C. Suresh Kumar ◽  
C. Santulli ◽  
F. Sarasini ◽  
A. Joseph Stanley
Keyword(s):  
Pattern Recognition ◽  
Acoustic Emission ◽  
Wavelet Transformation ◽  
Failure Modes ◽  
Emission Data

Variations in Acoustic Emission Between Graphite- and Glass-Epoxy Composites

1981 ◽  
Vol 15 (4) ◽  
pp. 591-597 ◽  
Author(s):  
Hiromitsu Otsuka ◽  
Henry A. Scarton
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Wave Phenomenon ◽  
Epoxy Composites ◽  
Fiber Breakage ◽  
Emission Data ◽  
Three Point Bending ◽  
Increasing Load

This paper presents acoustic emission data for graphite- and glass-epoxy, and glass-chopped matt composites. This micro-earthquake-like wave phenomenon resulting from microstructural failure is noted to possess dif ferent characteristics depending upon the composite material being tested. Results of three point bending of specimens and cantilevered specimens with transverse saw cuts under monotonically increasing load indicate that matrix crazing and combined delamination and fiber breakage occur at lower and higher amplitude, respectively. Differences in behavior were also noted be tween these materials as the type of loading was varied.

scholarly journals Acoustic Emission and K-S Metric Entropy as Methods for Determining Mechanical Properties of Composite Materials

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 145
Author(s):  
Lesław Kyzioł ◽  
Katarzyna Panasiuk ◽  
Grzegorz Hajdukiewicz ◽  
Krzysztof Dudzik
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Composite Material ◽  
Composite Materials ◽  
Testing Machine ◽  
Measurement Data ◽  
Entropy Method ◽  
Displacement Sensor ◽  
Metric Entropy ◽  
Plastic Phase

Due to the unique properties of polymer composites, these materials are used in many industries, including shipbuilding (hulls of boats, yachts, motorboats, cutters, ship and cooling doors, pontoons and floats, torpedo tubes and missiles, protective shields, antenna masts, radar shields, and antennas, etc.). Modern measurement methods and tools allow to determine the properties of the composite material, already during its design. The article presents the use of the method of acoustic emission and Kolmogorov-Sinai (K-S) metric entropy to determine the mechanical properties of composites. The tested materials were polyester-glass laminate without additives and with a 10% content of polyester-glass waste. The changes taking place in the composite material during loading were visualized using a piezoelectric sensor used in the acoustic emission method. Thanks to the analysis of the RMS parameter (root mean square of the acoustic emission signal), it is possible to determine the range of stresses at which significant changes occur in the material in terms of its use as a construction material. In the K-S entropy method, an important measuring tool is the extensometer, namely the displacement sensor built into it. The results obtained during the static tensile test with the use of an extensometer allow them to be used to calculate the K-S metric entropy. Many materials, including composite materials, do not have a yield point. In principle, there are no methods for determining the transition of a material from elastic to plastic phase. The authors showed that, with the use of a modern testing machine and very high-quality instrumentation to record measurement data using the Kolmogorov-Sinai (K-S) metric entropy method and the acoustic emission (AE) method, it is possible to determine the material transition from elastic to plastic phase. Determining the yield strength of composite materials is extremely important information when designing a structure.

Preparation of epoxy composite material containing natural aluminosilicate filler

2011 ◽  
Vol 4 (4) ◽  
pp. 281-283 ◽  
Author(s):  
P. A. Sitnikov ◽  
A. V. Kuchin ◽  
A. G. Belykh ◽  
I. N. Vaseneva ◽  
Yu. I. Ryabkov
Keyword(s):  
Composite Material ◽  
Epoxy Composite ◽  
Natural Aluminosilicate

The Estimation of Thermal Conductivity for Alumina-Epoxy Composite Material with High Filling Volume Fraction

2014 ◽  
Vol 918 ◽  
pp. 21-26
Author(s):  
Chen Kang Huang ◽  
Yun Ching Leong
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
Composite Materials ◽  
Physical Model ◽  
Electron Scattering ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
The Matrix ◽  
Transport Theorem ◽  
Good Agreement

In this study, the transport theorem of phonons and electrons is utilized to create a model to predict the thermal conductivity of composite materials. By observing or assuming the dopant displacement in the matrix, a physical model between dopant and matrix can be built, and the composite material can be divided into several regions. In each region, the phonon or electron scattering caused by boundaries, impurities, or U-processes was taken into account to calculate the thermal conductivity. The model is then used to predict the composite thermal conductivity for several composite materials. It shows a pretty good agreement with previous studies in literatures. Based on the model, some discussions about dopant size and volume fraction are also made.

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.

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