Fracture analysis of Kevlar-49/epoxy and e-glass/epoxy doublers for reinforcement of cracked aluminum plates

Kasavajhala, Ananth Ram Mahanth; Gu, Linxia

doi:10.1016/j.compstruct.2011.02.012

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…The higher in-plane shear properties (strength and modulus) of woven GFRE composites compared with those of KFRE composites are agreed well with the results of Eksi and Genel 32 and Kasavajhala and Gu. 35 Their results showed increases in the shear modulus of glass/epoxy by 83% compared with Kevlar/epoxy composite.…”

Section: Resultsmentioning

confidence: 95%

Impact and mechanical properties of different composite systems modified with multi-walled carbon nanotubes

Badawy

Khashaba

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Kevlar and glass fiber composites have distinguished mechanical properties such as specific strength and stiffness, resistance to impact loading, and tailoring the overall properties to meet the needs of a specific application. Enhancing their mechanical properties via incorporation of carbon nanotubes (CNTs) into their polymer matrices and proper characterization are very important for automotive and aerospace applications, which is the main objective of this study. This article presents an experimental study on manufacturing and mechanical characterization of six different materials. The tested materials include: CNT-nanocomposites, Kevlar fiber reinforce epoxy (KFRE) and glass fiber reinforced epoxy (GFRE) composites modified with CNTs. The CNTs were ultrasonically dispersed into the epoxy resin at 30% sonication amplitude (225 W) for 30 min to avoid their damage. The results were compared with the control materials (without CNTs). The mechanical tests are drop weight impact, tension, and in-plane shear. All the tests were performed according to ASTMs using computerized testing machines at room temperature. Results from the experimental study showed that the incorporation of the CNTs into the epoxy resin improves their tensile and shear strengths by 11% and 22.2%, respectively. In addition, the tensile and shear moduli of the CNT-nanocomposite were improved respectively by 68.7% and 29%. The absorbed energy and maximum contact force of the CNT-nanocomposite were improved by 11.4% and 9.5%, respectively. The tensile strength of the GFRE/CNT and KFRE/CNT composites showed improvements of 15.3% and 19.6%, respectively. The improvements in the tensile and shear moduli of GFRE/CNT and KFRE/CNT composites are in the range of 15–20%. The CNTs have marginal effects on the impact properties of the modified composite laminates. The tensile properties of the Kevlar composite systems (with and without CNTs) are higher than those of the glass composite systems and vice versa for the shear moduli and the absorbed energies.

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Section: Resultsmentioning

confidence: 95%

Impact and mechanical properties of different composite systems modified with multi-walled carbon nanotubes

Badawy

Khashaba

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The elastic constant of BFRP is taken from the work of Errouane et al (2014), and the properties of KFRP mentioned by Kasavajhala and Gu (2011) are used. Elastic constants of CFRP, hybrid and GFRP are obtained from the micromechanical models and entered as a material parameter in the ABAQUS to investigate the patch hybridization effects.…”

Section: Finite Element Modelingmentioning

confidence: 99%

“…One of the research challenges for composite patch repair is an improvement in the processing of patch fabrication and material selection. Research community has used fibers of boron, carbon, glass and Kevlar to prepare the composite patch ( Jamal-Omidi et al, 2014;Bouiadjra et al, 2015;Khalili et al, 2010;Kasavajhala and Gu, 2011). Among all these materials, carbon fiber remained always the first preference to repair the structure.…”

Section: Introductionmentioning

confidence: 99%

Towards hybridization of composite patch in repair of cracked Aluminum panel

Makwana

Shaikh

2019

IJSI

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Purpose The maintenance of aircraft structure with lower cost is one of the prime concerns to regulatory authorities. The carbon fiber-reinforced polymer (CFRP) patches are widely used to repair the cracked structure. The demands and application of CFRP compel its price to increase in the near future. A distinct perspective of repairing the cracked aluminum panel with the hybrid composite patch is presented in this paper. The purpose of this paper is to propose an alternative patch material in the form of a hybrid composite patch which can provide economical repair solution. Design/methodology/approach The patch hybridization is performed by preparing the hybrid composite from tows of carbon fiber and glass fiber. Rule of hybrid mixture and modified Halpin–Tsai’s equation are used to evaluate the elastic constant. The stress intensity factor and interfacial stresses are determined using finite element analysis. The debonding initiation load is evaluated after testing under mode-I loading condition. Findings The hybrid composite patch has rendered the adequate performance for reduction of stress intensity in the cracked panel and control of interfacial stresses in the adhesive layer. The repair efficiency and repair durability of the composite patch repair was ensured by incorporation of the hybrid composite patch. Originality/value The studies involving patch hybridization for the application of composite patch repair are presently lacking. The influence of the patch stiffness, methodology to prepare the hybrid composite patch and effects of hybridization on the performance of composite patch repair is presented in this paper.

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Enhancing Mechanical Characteristics and Cost-Efficiency of Composite Materials Through Hybridization and Nanoparticle Incorporation

Boopathy,

Balaji,

Bhoominathan

et al. 2024

Advances in Science, Technology &Amp; Innovation

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Fracture analysis of Kevlar-49/epoxy and e-glass/epoxy doublers for reinforcement of cracked aluminum plates

Cited by 13 publications

References 23 publications

Impact and mechanical properties of different composite systems modified with multi-walled carbon nanotubes

Impact and mechanical properties of different composite systems modified with multi-walled carbon nanotubes

Towards hybridization of composite patch in repair of cracked Aluminum panel

Enhancing Mechanical Characteristics and Cost-Efficiency of Composite Materials Through Hybridization and Nanoparticle Incorporation

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