Study on the effect of adhesive thickness of single lap joints using acoustic emission and FEA

Bak, K. Mohamed; Kalaichelvan, K.; Vijayaraghavan, G.; Dinesh, M.; Arumugam, V.

doi:10.1784/insi.2012.55.1.35

Cited by 14 publications

(14 citation statements)

References 7 publications

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“…These results deemed to correspond to adhesive failure mode, confirming what was found in the pure resin bonded joint specimen, except that when fibers are added to the resin there is a slight increase in the peak frequency range. 22 Light-fiber tear failure and fiber tear failure are characterized using single-layer and double-layer specimen of adhesive-bonded joints.…”

Section: Mechanical Characterization Of Single-lap Joints In Gfrp Laminatesmentioning

confidence: 99%

“…They concluded that mixture of adhesive failure and small amount of GFRP adherend failure, and fiber tear failure were observed in the IAF joints using AE monitoring. Mohamed Bak et al 22 reported an experimental and numerical study to identify the ultimate strength and failure modes of single-lap bonded joints at two different overlap thicknesses. Matrix failures occur mainly in the frequency range of 80-110 kHz with low amplitude and light-fiber tear failures (failure is very close to the adhesive-substrate interface) are mainly in the range of 110-200 kHz with moderate amplitude and duration.…”

Section: Introductionmentioning

confidence: 99%

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

Bak¹,

Kalaichelvan

Jothilingam

et al. 2015

Journal of Composite Materials

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The main objective of this study is to predict the joint strength and frequency ranges for failure modes on single-lap joints of glass fiber/epoxy specimens under tensile loading, without causing much damage to the lap joint specimen. To design structural components using composite materials, a deep understanding about the material behavior and its failure modes are necessary. To create a better understanding of the adhesive failure, unstable growth and failure process monitoring during mechanical loading is important. Parametric analysis and multistage approach appears to be an efficient tool to correlate the mechanical behavior of composite single-lap joints namely bonded joint, riveted joint, and hybrid joint with acoustic response. The dominant failure modes and their characteristic frequency ranges are assigned to the different acoustic emission (AE) signal levels on the basis of AE waveform in the time domain using fast Fourier transform (FFT) analysis. FFT analysis is performed for the peak frequency ranges and the results are interpreted with respect to the amplitude and duration hit activity for each failure mode. The results obtained from AE parametric analysis are compared with FFT analysis results to find the peak frequency ranges for each failure mode. Scanning electron microscopy was used to categorize the defects in the post-test specimen, and AE data were correlated to the damage events.

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Section: Mechanical Characterization Of Single-lap Joints In Gfrp Laminatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Bak¹,

Kalaichelvan

Jothilingam

et al. 2015

Journal of Composite Materials

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“…The range of peak frequency pertaining to the failure mode on single-lap joints in GFRP has been identified using frequency analysis. 28 Figure 4 shows the plot of peak frequency versus cumulative counts and time for bonded single-lap joint basalt/epoxy specimens. Two ranges of frequency content such as 90-110 kHz and 110-200 kHz are identified until the joint fails.…”

Section: Mechanical Characterization Of Bonded Riveted and Hybrid Single Lap Jointsmentioning

confidence: 99%

A novel approach for classification of failure modes in single lap joints using acoustic emission data

Bak

Kalaichelvan

Arumugam

2013

Journal of Composite Materials

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New innovative basalt fiber/epoxy composite materials are used in engineering applications such as aerospace, automotive, and civil structures due to the potential low cost of this material together with its mechanical characteristics and its failure mechanisms. Acoustic emission is a passive nondestructive testing technique for real-time monitoring of damage developed in materials and structures, which have been used successfully for the identification of damage mechanisms in composite joints under tensile loading. The present study is focussed on acoustic emission characterization of failure modes in three prominent joining methods namely, bonded, riveted, and hybrid joints during tensile test. Parametric analysis is performed on the acoustic emission data obtained during the tensile testing of these types of joints to discriminate the failure modes. Fast Fourier transform analysis using acoustic emission waveform analysis is carried out to analyze the different failure events and associate them with their dominant frequency ranges. The predominance of failure modes in each signal is used as a key in the study to discriminate failure modes on single-lap joints in basalt/epoxy composite laminate, and the results are validated with fast Fourier Transform analysis.

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“…Tsuey et al [12] studied the defect of lap joint in tension and its effect of shear strength using aluminum adherend and brittle adhesive. Bak et al [13] worked on the effect of bonded lap thickness area on the tensile strength of lap and found that maximum stress occurred at the corner section of the joint whereas minimum stress occurred at the displacement 0.2 mm. Significant decrease in the stress distribution occurs throughout the joint, due to enhanced adhesive thickness area of the overlap.…”

Section: Introductionmentioning

confidence: 99%

Combine experimental and FEM analysis of adhesive bonded single lap joint with Al-alloy flat adherends and pre-embedded artificial defects

Sahu

Mishra

2019

SN Appl. Sci.

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Adhesive bonded lap joint is considered to be better substitute to riveted or welded joints for aerospace, marine and structural applications. It is due to the ability to develop relatively lower stress concentration and fatigue severity in highly dynamic environment. In real practice, there are defects present in the joint interface that decide the strength and durability of the component. Hence, it is required to understand the joint strength with different defect geometries. In this paper, a combined experimental and finite element method is conducted to evaluate the strength of lap joint of Al-alloy flat plate, pre-embedded with defects of various geometries: square, rectangle, circular and elliptical. The results of experimental and FEM analysis are converging, and indicate the clear variation of strength due to different type of defects. It encourages further analysis.

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Study on the effect of adhesive thickness of single lap joints using acoustic emission and FEA

Cited by 14 publications

References 7 publications

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

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

A novel approach for classification of failure modes in single lap joints using acoustic emission data

Combine experimental and FEM analysis of adhesive bonded single lap joint with Al-alloy flat adherends and pre-embedded artificial defects

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