Evaluation of kissing bond in composite adhesive lap joints using digital image correlation: Preliminary studies

Kumar, Rajesh; Bhat, M.R.; Murthy, C. Siva Ram

doi:10.1016/j.ijadhadh.2013.01.004

Cited by 96 publications

(27 citation statements)

References 25 publications

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“…Some attempts to use DIC to evaluate composite structures and adhesive joints have also been reported. [39][40][41][42] Colavito et al [39] have given a detailed presentation on refinements to be made to DIC technique to extract adhesive strains in lap joints. Figure 5 illustrates the experimental setup used for the current work.…”

Section: Measurement Of Adhesive Strains Using Dicmentioning

confidence: 99%

Analysis of composite single lap joints using numerical and experimental approach

Kumar¹,

Bhat²,

Murthy³

2014

Journal of Adhesion Science and Technology

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Adhesives are widely used to execute the assembly of aerospace and automotive structures due to their ability to join dissimilar materials, reduced stress concentration, and improved fatigue resistance. The mechanical behavior of adhesive joints can be studied either using analytical models or by conducting mechanical tests. However, the complexity owing to multiple interfaces, layers with different properties, material and geometric nonlinearity and its three-dimensional nature combine to increase the difficulty in obtaining an overall system of governing equations to predict the joint behavior. On the other hand, experiments are often time consuming and expensive due to a number of parameters involved. Finite element analysis (FEA) is profoundly used in recent years to overcome these limitations. The work presented in this paper involves the finite element modeling and analysis of a composite single lap joint where the adhesive-adherend interface region was modeled using connector elements. The computed stresses were compared with the experimental stresses obtained using digital image correlation technique. The results showed an agreement. Further, the failure load predicted using FEA was found to be closer to the actual failure load obtained by mechanical tests.

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Section: Measurement Of Adhesive Strains Using Dicmentioning

confidence: 99%

Analysis of composite single lap joints using numerical and experimental approach

Kumar¹,

Bhat²,

Murthy³

2014

Journal of Adhesion Science and Technology

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“…[8,9] Recently, emphasis has been given on detecting a lack of adhesion at the interface, "kissing bonds" or "weak bonds", since the mere detection of voids prove to be insufficient to guarantee good bond quality. [10] Different techniques have been investigated such as ultrasonic techniques, [11][12][13][14] thermography, [15,16] digital image correlation, [17] dynamic response [18] etc. Results show the dependency on compressive loads for the detectability through ultrasonic techniques [19] and the potential of nonlinearity shown when "weak bonds" are illuminated with ultrasound.…”

Section: Introductionmentioning

confidence: 99%

The use of acoustic emission and composite peel tests to detect weak adhesion in composite structures

Freitas

Zarouchas

Poulis

2018

The Journal of Adhesion

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Adhesive bonding is one of the most promising joining technologies for composite aircraft. However, to comply with current aircraft certification rules, current safety-critical bonded joints, in which at least one of the interfaces requires additional surface preparation, are always used in combination with redundant mechanical fasteners, such as rivets and bolts. This lack of trust in bonded structures is mostly linked to the fear of lack of adhesion or a "weak bond".The aim of this paper is to tackle this challenge by assessing the ability to use composite peel tests and acoustic emission (AE) technique to assess adhesion quality and distinguish a good bond quality from a "weak bond".Composite Bell Peel (CBP) tests and Double-CantileverBeam (DCB) tests were performed on contaminated and noncontaminated CFRP bonded specimens. The results show that peel strength drops significantly at the location of the contaminated interface that has led to weak adhesion, as a result from adhesive failure. The AE signals obtained during DCB tests show different features for cracks growing at the interface ("weak bonds") and inside the adhesive layer (cohesive failure). In addition to this, scattering of the AE signals were observed in the contaminated specimens with "weak bonds". ARTICLE HISTORY

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“…When a kissing bond appears, surrounded by a wellbonded area, sufficient compressive residual stress at the adherend-adhesive interface makes the flaw invisible for many conventional nondestructive testing methods such as ultrasounds. In [6] digital image correlation (DIC) has been used to detect and evaluate kissing bonds and the main finding is that digital image correlation technique could detect the kissing bonds even at 50% of the failure load. The main downside of this method is that it requires a heavy experimental effort and fall outside the category of the possible SHM approaches.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive testing techniques based on nonlinear methods for assessment of debonding in single lap joints

et al. 2015

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Nonlinear ultrasonic non-destructive evaluation (NDE) methods can be used for the identification of defects within adhesive bonds as they rely on the detection of nonlinear elastic features for the evaluation of the bond strength. In this paper the nonlinear content of the structural response of a single lap joint subjected to ultrasonic harmonic excitation is both numerically and experimentally evaluated to identify and characterize the defects within the bonded region. Different metallic samples with the same geometry were experimentally tested in order to characterize the debonding between two plates by using two surface bonded piezoelectric transducers in pitch-catch mode. The dynamic response of the damaged samples acquired by the single receiver sensor showed the presence of higher harmonics (2 nd and 3 rd ) and subharmonics of the fundamental frequencies. These nonlinear elastic phenomena are clearly due to nonlinear effects induced by the poor adhesion between the two plates. A new constitutive model aimed at representing the nonlinear material response generated by the interaction of the ultrasonic waves with the adhesive joint is also presented. Such a model is implemented in an explicit FE software and uses a nonlinear user defined traction-displacement relationship implemented by means of a cohesive material user model interface. The developed model is verified for the different geometrical and material configurations. Good agreement between the experimental and numerical nonlinear response showed that this model can be used as a simple and useful tool for understanding the quality of the adhesive joint.

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Evaluation of kissing bond in composite adhesive lap joints using digital image correlation: Preliminary studies

Cited by 96 publications

References 25 publications

Analysis of composite single lap joints using numerical and experimental approach

Analysis of composite single lap joints using numerical and experimental approach

The use of acoustic emission and composite peel tests to detect weak adhesion in composite structures

Non-destructive testing techniques based on nonlinear methods for assessment of debonding in single lap joints

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