Experimental and numerical studies on adhesively bonded CFRP laminates with closed debonds

Senthil, K.; Arockiarajan, A.; Palaninathan, R.; Santhosh, B; Usha, K.

doi:10.1016/j.compstruct.2012.08.007

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…Different from mechanical joints which have stress concentrations around fastener holes, the stresses in adhesive bonding are distributed over the entire bond area (Senthil et al, 2013a). Debonding is discrete regions where the composite joint is not bonded together that arises from manufacturing issues, presence of entrapped air or damages during services (Senthil et al, 2013b). Under compressive loading, the growth and expansion of debonding can lead to joint failure at stress levels well below the material capability and finally affect the performance of structures.…”

Section: Delamination and Debondingmentioning

confidence: 99%

Nondestructive testing and evaluation techniques of defects in fiber-reinforced polymer composites: A review

Chen

Jin²

2022

Front. Mater.

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Fiber-reinforced polymer composites have excellent mechanical properties and outstanding development potential and are cost-effective. They have increasingly been used in numerous advanced and engineering applications as materials for wind turbine blades, helicopter rotors, high-pressure pipelines, and medical equipment. Understanding and assessing structural failure promptly in the whole lifecycle of a composite is essential to mitigating safety concerns and reducing maintenance costs. Various nondestructive testing and evaluation (NDT&E) technologies based on different evaluation principles have been established to inspect defects under different conditions. This paper reviews the established types of NDT&E techniques: acoustic emission, ultrasonic testing, eddy current testing, infrared thermography, terahertz testing, digital image correlation, shearography, and X-ray computed tomography, which is divided into three categories based on the operation frequency and data processing means of the output signal that is directly under analysis. We listed four types of defects/damage that are currently of great interest, namely, voids and porosity, fiber waviness and wrinkling, delamination and debonding, as well as impact damage. To identify a suitable method for different defects/damage, we performed characterization and evaluation by using these NDT&E techniques for typical defects/damage. Then, the cost, inspection speed, benefits and limitations, etc. were compared and discussed. Finally, a brief overview of the development of the technologies and their applications in the field of composite fabrication was discussed.

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Section: Delamination and Debondingmentioning

confidence: 99%

Nondestructive testing and evaluation techniques of defects in fiber-reinforced polymer composites: A review

Chen

Jin²

2022

Front. Mater.

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“…da Silva and Adams 19 have proposed the techniques to decrease the transverse stresses in the composite adherend in double-lap joint and enhance the joint strength using mixed adhesive particularly at low temperatures. Senthil et al 20 carried out numerical and experimental investigations on the buckling capability of adhesively bonded composite specimens with closed debonds. Akbarov et al [21][22][23] had an intensive study on the delamination buckling of rectangular elastic and viscoelastic sandwich plate-containing interface inner, rectangular band, and edge cracks under uni-axial and bi-axial-loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance studies on compressively loaded debonded composite splice joint

Senthil

Arockiarajan

Palaninathan

2014

Journal of Composite Materials

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Carbon fiber-reinforced polymer structures are being increasingly used in aerospace applications. In this work, analytical, numerical, and experimental investigations are carried out to understand the structural response of debonded carbon fiber-reinforced polymer splice joint subjected to compression load. It is found that debonds are of major importance for the behavior of carbon fiber-reinforced polymer splice-joint structures. A series of carbon fiber-reinforced polymer splice-joint specimens are subjected to compressive loading by introducing an artificial debond at one of the interfaces in the splice joint and compared with specimens without debond. Although the compressive behavior is similar to that of nominal splice joint, the stiffness is considerably decreased in the presence of debond, and also the load-carrying capacity is reduced by 17% approximately. The experimental results are compared with the analytical predictions and numerical simulations using (a) the Rayleigh–Ritz method and (b) the finite element method, respectively, and are in good correlation.

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“…Her 11 performed an elastic stress analysis in single-and doublelap joints, analytically. Senthil et al 12 investigated experimental and numerical buckling forces of adhesively bonded carbon-epoxy laminates with closed debonds. The finite element package MSL/ NASTRAN was used for the numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

Multi-linear stress analysis in adhesively bonded double-lap joint

Sayman

Arıkan

Doğan

et al. 2013

Journal of Composite Materials

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In this study, an elastic–plastic stress analysis is carried out in fiber glass-epoxy adherends with DP460 ductile adhesive. Multi-linear plastic solution is applied to the joints. Analytical results are checked using a multi-linear finite element solution, ANSYS 12. Analytical and numerical solutions are found to be in good agreement. The thickness of the adherend is chosen as 1.8 mm, 2.5 mm and 3 mm. It is observed that when the thickness of the adherend is increased, the intensity of the peel stress raises. Shear and peel stresses are found to be the highest at or around the free ends of the adhesive. The multi-linear solution yields a closer solution with respect to the bilinear solution since it follows the stress–strain diagram.

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Experimental and numerical studies on adhesively bonded CFRP laminates with closed debonds

Cited by 8 publications

References 15 publications

Nondestructive testing and evaluation techniques of defects in fiber-reinforced polymer composites: A review

Nondestructive testing and evaluation techniques of defects in fiber-reinforced polymer composites: A review

Performance studies on compressively loaded debonded composite splice joint

Multi-linear stress analysis in adhesively bonded double-lap joint

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