Acoustic emission characterization of failure modes of single-lap joints in glass/epoxy specimens

Bak, K. Mohamed; Kalaichelvan, K.; Jothilingam, A.; Rajendraboopathy, S.

doi:10.1177/0021998315569749

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…4). Bak et al (2016) associated the AE frequency range of 100 kHz with the failure of epoxy. Analysis of the resultant spectra of the AE signals emitted by the epoxy with boundary contents of the PES (i.e.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Fracture of Epoxy-Filled Composites by Acoustic Emission

Arnautov

Bikovens

Gribniak

et al. 2016

Journal of Civil Engineering and Management

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Acoustic emission (AE) technique is widely used to monitor failure processes in composite materials includ-ing development of cracks and plastic deformations within the polymer matrix, fracture and debonding of inclusions, etc. In this study, the AE technique was applied investigating failure character of epoxy polymers with different content of nanofiller – fine polyethersulfone (PES) powder. Variation of material properties of the epoxy with 0, 5%, 7.5%, 10%, and 12.5% concentration (by weight) of the PES was assessed experimentally. Correlation between the PES content and the modulus of elasticity was found negligible. The same was characteristic for the tensile strength. Whereas, such a correlation was found significant for the fracture toughness that increased 1.5 times concerning the pure epoxy reference. Analysis of the cumulative AE counts indicated existence of three different stages of the damage accumulation process, which were unidentified using the load and the deformation diagrams. In the PES-modified composites, the damage ac-cumulation process was evidenced at the 10–20% of the ultimate load; whereas, in the pure epoxy, such a process was fairly slow until the 85% of the loading.

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Section: Resultsmentioning

confidence: 99%

Investigation on Fracture of Epoxy-Filled Composites by Acoustic Emission

Arnautov

Bikovens

Gribniak

et al. 2016

Journal of Civil Engineering and Management

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“…Decreasing the adherent layers also increases the level of shear in the adhesive [4]. KMohamad Bak [9] Fabricated laminates as shown in Fig 1.…”

Section: About Jointmentioning

confidence: 99%

“…In one spot we can observe the local RMS level decrease, which indicates the change in otherwise gradually ascending trend of AE activity [1]. Varies Zones in Output of Acoustic Emission Test gives idea of Debonding, Delamination, Matrix Cracking and Breaking of suspense in fibres [9].…”

Section: -Distance Between the Ends Of Straps L 3 -Total Length H-thi...mentioning

confidence: 99%

A Review on Acoustic Emission Characterization of Failure Modes of Carbon Fiber Reinforced Composites

Prasad¹,

Rao²

2018

AMR

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Among various composites available for use, carbon fiber reinforced composite is unique in its Nature. Carbon fiber is an extremely strong thin fiber made by pyrolyzing synthetic fibers, such as rayon, until charred. High Strength Composites are made from this fiber by using appropriate matrix material mostly Epoxy resins are used. High Strength, stiffness, light weight and high thermal conductivity are the main advantages over the other composites. Making products with one single composite sheet is not possible always. Some of the intricate or complex shape making is required for joining of two composite sheet. The composites joining can be done in three ways mainly Adhesive, Riveting and Hybrid. Based on the Review among all these joints adhesive joining gives better economic solution in joining. Experimental results point to significant influence of fibre on mechanical properties of sample. The tensile test of the acoustic signal emission (AE) to identify the current state of material integrity in real time. Acoustic system signal correlated to damage events. The carbon fiber composite characteristic failure mechanisms are initiated on the microscale and result in a spontaneous release of elastic energy in terms of mechanical stress waves, the so-called acoustic emissions.

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“…The ultimate load of reinforced bonded single lap joint was 1.3%-22.8% higher than that of the unreinforced adhesive. Furthermore, mode I [18][19][20] and mode II [21][22][23] fracture energy of composite adhesive joints was studied through experiment and theoretical analysis in recent years.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission response and progressive failure behaviors of composite adhesively bonded joints loaded by Mode I and II

Liu

Shen

Zhang

et al. 2019

Mater. Res. Express

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The analysis of progressive failure process is one of the critical issues in the research of composite adhesive joints. In view of this point, acoustic emission (AE) is applied to real-time monitoring of the dynamic damage process of composite adhesive joints in some loading modes such as Mode I (double cantilever beam (DCB)) and Mode II (end notch flexures (ENF)). Furthermore, the high speed camera and scanning electron microscopy are carried to analyses the damage mechanisms of composite bonded joints. Results show that there are significant differences in the load-deflection curves of the specimens under the loads of Mode I and II. The main failure mode of the two types of loading modes is adhesion failure, and the accumulation of damage observed at the edge of the adhesively bonded layer cause defeat of the composite bonded joints. In addition, AE parameters including amplitude, hits, energy, and duration are connected with the fail mechanism. Furthermore, the dynamic characteristics of the AE signal, especially amplitude spectrum distribution, can provide evidences for studying progressive failure behaviors of composite adhesive joints.

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Acoustic emission characterization of failure modes of single-lap joints in glass/epoxy specimens

Cited by 11 publications

References 27 publications

Investigation on Fracture of Epoxy-Filled Composites by Acoustic Emission

Investigation on Fracture of Epoxy-Filled Composites by Acoustic Emission

A Review on Acoustic Emission Characterization of Failure Modes of Carbon Fiber Reinforced Composites

Acoustic emission response and progressive failure behaviors of composite adhesively bonded joints loaded by Mode I and II

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