Enhancing the short-beam strength of composite laminates using helical carbon nanotubes

Sritharan, Ramanan; Askari, Davood

doi:10.1016/j.compositesb.2021.108999

Cited by 12 publications

(22 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the contact, the contact force value read on the loading roller started to increase, and after reaching the maximum point, it was observed that it gradually decreased due to fiber damage in the composite sample. The maximum force value read here is defined as the damage load [2]. The first linear ascending portion of the curve represents the stiffness of the undamaged plate.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, accurate estimation of this value is important for composites. Sritharan and Askari [2] used helical carbon nanotubes with various weight percentages as additional reinforcement to glass fiber composite laminates. They calculated the short-beam strength of the reinforced composites they obtained according to the ASTM D2344 standard.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical determination of interlayer shear strength of glass fiber-reinforced epoxy composites

Albayrak¹,

Asan²,

Kaman³

et al. 2022

JSEAM

View full text Add to dashboard Cite

This study aims to produce glass fiber composite plates by vacuum infusion method and to determine the interlaminar shear strength (ILSS) under the short beam test. For this purpose, composite plates were produced under the effect of vacuum and temperature by adding glass fiber layers on a flat vacuum table. Short beam tests were carried out on the obtained laminated composite plates and the interlayer shear strength, which is generally characterized by delamination damage, was investigated. In the numerical part, the tests were modeled using the LS-DYNA finite element package program, and the Hashin damage criterion-based material model was used to see the damages that occurred in the composite structure after the tests.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical determination of interlayer shear strength of glass fiber-reinforced epoxy composites

Albayrak¹,

Asan²,

Kaman³

et al. 2022

JSEAM

View full text Add to dashboard Cite

show abstract

“…To enhance the mechanical and functional properties of composites, carbon-based NMs such as carbon nanotubes (CNTs). − ,,,− graphene nanoplates (GnPs) ,,,,− and their combinations ,, have been widely used in CFRPs. Although the results of these studies serve well for their purpose, most of these processes rely on the chemical functionalization of CNTs and GnPs, which is an effective method, but it adds costs and causes damage to the CNT and GnP structure that deteriorates their intrinsic properties. , To lower the manufacturing costs of hybrid composites, it is ideal to use pristine CNTs and GnP; however, due to their strong Van der Waals attraction, homogeneous dispersion of pristine CNTs and GnPs is very challenging …”

Section: Introductionmentioning

confidence: 99%

“…1,22 To enhance the mechanical and functional properties of composites, carbon-based NMs such as carbon nanotubes (CNTs). 1−3,7,8,23−29 graphene nanoplates (GnPs) 3,7,8,20,30−33 and their combinations 12,22,34 have been widely used in CFRPs. Although the results of these studies serve well for their purpose, most of these processes rely on the chemical functionalization of CNTs and GnPs, which is an effective method, but it adds costs and causes damage to the CNT and GnP structure that deteriorates their intrinsic properties.…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocrystal-Enabled Tailoring of the Interface in Carbon Nanotube- and Graphene Nanoplatelet-Carbon Fiber Polymer Composites: Implications for Structural Applications

Kaynan

Pérez

Asadi

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Cellulose nanocrystals (CNCs) enable the effective coating of carbon fibers (CFs) with pristine carbon nanotubes (CNTs) and graphene nanoplatelets (GnPs). Herein, we articulate the mechanisms that form the interface of CNC-bonded CNT and CNC-bonded GnP-CF reinforced polymer (CFRP) composites that are suitable for structural applications. We show that CNCs provide a suitable platform to engineer the interface of hybrid composites. We demonstrate that the hybrid nanomaterials, i.e., CNC and CNT/GnP, alter the chemical composition of the interface and its properties, and despite the similar elemental composition of the CNT and GnP, the mechanical properties of the produced composites differ. Our results show that the presence of CNC–CNT and CNC–GnP creates a 4 μm interfacial region that leads to a 200 and 145% increase in interfacial shear strength and a 46 and 28% enhancement in interlaminar shear strength, respectively. Furthermore, density functional theory calculations show that the binding energy between the CNC–CNT and CF sizing agent is 14% higher than that of CNC–GnP underlining the effect of chemical and physical interactions in the observed difference in mechanical properties. The understanding gained from this study highlights a path forward bottom-up manufacturing of hybrid composites with an engineered microstructure and properties from the molecular level and nanoscale to higher scales.

show abstract

“…The hand-layup process involves the preparation of fabrics, mixing of polymer with a hardening agent, preparation of tool and caul plates, impregnation of the resin, stacking of impregnated fabric layers onto the tool plate, vacuum bagging, application of vacuum pressure, and curing. 2,3 To fabricate a good quality (i.e., porosity-free, foreign object debris-free, and delamination-free) composite laminate using the hand-layup technique, one must follow the fabrication process carefully. The most common mistakes in the hand-layup process are during the weighing and mixing of epoxy polymer with the hardening agent.…”

Section: Introductionmentioning

confidence: 99%

A design of experiment study to investigate the effects of hardener concentration, stirring time, and air bubbles on the tensile strength of epoxy resin

Sritharan

Askari

2022

Journal of Elastomers & Plastics

View full text Add to dashboard Cite

Epoxy is one of the widely used polymeric resin systems in composite industries, which is a two-part resin system that requires the mixing of a hardening agent to trigger the polymerization process. The mixing ratio and pot-life are usually specified and provided by the manufacturer; however, the stirring time and the details of the mixing process were left to the fabricator to configure, based on some visual observations, which may vary from person to person. Although the mixing ratio is fixed by the resin manufacturer, errors may occur during the weighing and transfer of resin parts. The hardener concentration and stirring time are two of the most important factors that can affect the resin properties. In addition, air bubbles can be formed during the stirring process, which is inevitable. Design of experiment (DOE) is one of the widely used tools to design, control, and study the effects of multiple factors. In this research, DOE with a factorial design of 23−1 (2k−1) was used to study the effects of hardener concentration, stirring time, and air bubbles on the tensile strength of epoxy resin. Test specimens were fabricated, cut, and tested as per ASTM D638 standard (i.e., common test performed in the industry for plastics) in a randomized order and then the results were statistically analyzed using Design-Expert software. The test results showed that all three factors significantly affect the tensile strength of the epoxy, and they should be carefully optimized and used for the fabrication of composite materials with optimal properties.

show abstract

Enhancing the short-beam strength of composite laminates using helical carbon nanotubes

Cited by 12 publications

References 41 publications

Experimental and numerical determination of interlayer shear strength of glass fiber-reinforced epoxy composites

Experimental and numerical determination of interlayer shear strength of glass fiber-reinforced epoxy composites

Cellulose Nanocrystal-Enabled Tailoring of the Interface in Carbon Nanotube- and Graphene Nanoplatelet-Carbon Fiber Polymer Composites: Implications for Structural Applications

A design of experiment study to investigate the effects of hardener concentration, stirring time, and air bubbles on the tensile strength of epoxy resin

Contact Info

Product

Resources

About