Enhancing strength and stiffness of composite joint through co-cure technique

Dhilipkumar, Thulasidhas; Rajesh, M.

doi:10.1016/j.coco.2021.100878

Cited by 30 publications

(15 citation statements)

References 14 publications

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“…The frequency response and damping value of composites were calculated directly using DEWE tools. Using the circle fit method, DEWE software measures damping value related to a specific mode with the following expression (1).…”

Section: Experimental Free Vibrational Analysismentioning

confidence: 99%

“…Composite joints can be secondary bonded, which requires the adhesive joining of two cured laminates, or co‐bonded, which requires adhesive joining of uncured laminate with cured laminate or co‐cured, which requires the curing of both the laminates and the adhesive in a single production process. [ 23 ] Before using these materials in critical load‐bearing applications, a better understanding of the failure behavior of these composite joining methods is necessary. Co‐cure joints, for instance, can have issues with entombed water, both free and bound have been released during the joining process, adversely impacting the adhesive joint's performance.…”

Section: Introductionmentioning

confidence: 99%

“…Usage of fiber-reinforced polymer (FRP) composite is widely increased in structural applications driven by the need for high strength and lightweight structures in aerospace, automobile, and shipbuilding industries. [1][2][3][4][5][6][7][8] Carbon, glass, and aramid are the three main types of fibers used to manufacture composite materials. [9][10][11][12][13] Epoxies and vinyl esters are commonly used as matrix materials.…”

Section: Introductionmentioning

confidence: 99%

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Effect of manufacturing processes and multi‐walled carbon nanotube loading on mechanical and dynamic properties of glass fiber reinforced composites

Dhilipkumar

Rajesh

2022

Polymer Composites

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An effective manufacturing process and high‐performance composite structures are indispensable in the aerospace, automobile, and shipbuilding industries. The current study focuses on the combined effect of carbon nanotube (CNT) reinforcement and manufacturing methods such as co‐curing, co‐bonding, and secondary bonding (SB) on mechanical and free vibrational behavior of glass fiber reinforced plastic composite. Results affirmed that composite fabricated using co‐cure manufacturing method with 1 wt% CNT loading improved the tensile strength by 22.8%, 12.7% compared to co‐bonded and secondary bonded composites due to rougher surface formation over the fiber improved the adhesion between fiber and matrix. On the other hand, 0.25 wt% CNT added secondary bonded composite had the highest (398.19 MPa) flexural strength. The modal analysis asserted that 1 wt% CNT added co‐cured composite beam had the higher fundamental natural frequencies while higher wt% CNT loading enhanced the damping properties owing to higher interaction among fiber and matrix. The current study exposes that mechanical properties and free vibrational characteristics can be improved by selecting the right manufacturing technique and appropriate weight fractions of CNTs. The co‐cure manufacturing with 1 wt% of CNTs and SB with 0.25 wt% of CNTs provided the greatest enhancement to adhesively bonded composites' mechanical properties and dynamics characteristics.

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Section: Experimental Free Vibrational Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of manufacturing processes and multi‐walled carbon nanotube loading on mechanical and dynamic properties of glass fiber reinforced composites

Dhilipkumar

Rajesh

2022

Polymer Composites

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“…Thus, it caused composite adherend to bend out-of-plane and increased the transverse peel stress in the adhesive layer, which initiated the crack formation and reduced failure resistance of composite joints. 11,12 Researchers developed three-dimensional reinforcement methods such as braiding, stitching, tufting, weaving and Zpinning to enhance the reliability and structural efficacy of the composite joints. 13,14 Z-pinning is an effective method to enhance composite joints' shear properties and fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of glass fibre reinforced polymer composite pin reinforcement on shear and dynamic behaviour of composite joint manufactured through co-cure technique

Dhilipkumar

Rajesh

2022

Journal of Composite Materials

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The co-cure technique efficiently joins composite components in wings, ailerons, skins, ribs and spars in aeronautical applications. The present study investigates the effect of through-thickness reinforcement of glass fibre reinforced polymer composite pin on shear and dynamic properties of co-cured composite joints. The experimental results exhibited that through-thickness reinforcement with 2% composite pin volume significantly improved the shear strength and elongation limit by 38.4% and 102.4% compared to unpinned joints. Furthermore, composite pin reinforcement changed the catastrophic failure of co-cured joints to progressive failure due to the tougher bridging traction of composite pins. The comparison of fractured surfaces exposed that debonding, composite pin pull-out and shear fracture of pins are the major failure mechanisms involved in enhanced shear strength and progressive failure of co-cured composite joints. The experimental modal analysis avowed that through-thickness reinforcement with 2% composite pin volume improved the fundamental natural frequency of the co-cure joints, while co-cure joint reinforced with higher volume (4%) of composite pins had higher damping value due to excessive fibre damage, which increased interaction between composite adherent and adhesive.

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An experimental investigation on the adhesive, shear strength, and failure modes of glass fibre reinforced polymer flat‐joggle‐flat composite joints over different bonding techniques

Hiremath,

Reddy

2023

Materialwissenschaft Werkst

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The utilisation of composite materials, especially glass fibre‐reinforced polymer has significantly developed as a result of design innovations in aircraft applications. Joints are a major issue as they are the weak point of composite construction. In this study, considering a flat‐joggle‐flat joint over the single‐lap‐joint, the effect of different manufacturing techniques on co‐bonding, secondary‐bonding, and co‐curing for flat‐joggle‐flat joints on the shear behaviour and dynamic characteristics were investigated. The results affirmed that flat‐joggle‐flat joints increased the load‐carrying capacity by 110 % compared to single‐lap joint. In continuance, results revealed that co‐cure flat‐joggle‐flat joints enhanced the load by 86.43 % and 20.00 %, along with increased shear strength of 8.9 MPa over co‐bonding and secondary‐bonding. Field emission scanning electron microscopy reveals that destructive failure occurs at joints in co‐bonding and secondary‐bonding due to an increase in stress between the adhesive and the adherend, which can lead to fibre failure and matrix damage. The dynamic characteristics, like fundamental natural frequency, are increased in co‐cure flat‐joggle‐flat joint compared to co‐bonding and secondary‐bonding joints. The investigation reveals that innovative flat‐joggle‐flat joints and suitable manufacturing processes improve the shear strength, and dynamic properties of composite joints.

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Enhancing strength and stiffness of composite joint through co-cure technique

Cited by 30 publications

References 14 publications

Effect of manufacturing processes and multi‐walled carbon nanotube loading on mechanical and dynamic properties of glass fiber reinforced composites

Effect of manufacturing processes and multi‐walled carbon nanotube loading on mechanical and dynamic properties of glass fiber reinforced composites

Influence of glass fibre reinforced polymer composite pin reinforcement on shear and dynamic behaviour of composite joint manufactured through co-cure technique

An experimental investigation on the adhesive, shear strength, and failure modes of glass fibre reinforced polymer flat‐joggle‐flat composite joints over different bonding techniques

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