Interface fracture of sandwich composites: Influence of MWCNT sonicated epoxy resin

Patra, Alak Kumar; Mitra, Nilanjan

doi:10.1016/j.compscitech.2014.07.006

Cited by 48 publications

(17 citation statements)

References 46 publications

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“…Within a brittle matrix such as epoxy, CNTs are able to function as a toughening material by bridging the lamina interfaces. Studies report that in addition to increasing the tensile strength, tensile modulus [2,15,17], flexural strength, and flexural modulus of epoxy [19], incorporating CNTs into a polymer matrix can limit creep and enhance the shear strength of the matrix [20], as well as improve the fracture toughness of the composite [18,21].…”

Section: Introductionmentioning

confidence: 99%

Interlaminar Fracture Toughness of CFRP Laminates Incorporating Multi-Walled Carbon Nanotubes

et al. 2015

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Carbon fiber reinforced polymer (CFRP) laminates exhibit limited fracture toughness due to characteristic interlaminar fiber-matrix cracking and delamination. In this article, we demonstrate that the fracture toughness of CFRP laminates can be improved by the addition of multi-walled carbon nanotubes (MWCNTs). Experimental investigations and numerical modeling were performed to determine the effects of using MWCNTs in CFRP laminates. The CFRP specimens were produced using an epoxy nanocomposite matrix reinforced with carboxyl functionalized multi-walled carbon nanotubes (COOH-MWCNTs). Four MWCNTs contents of 0.0%, 0.5%, 1.0%, and 1.5% per weight of the epoxy resin/hardener mixture were examined. Double cantilever beam (DCB) tests were performed to determine the mode I interlaminar fracture toughness of the unidirectional CFRP composites. This composite material property was quantified using the critical energy release rate, GIC. The experimental results show a 25%, 20%, and 17% increase in the maximum interlaminar fracture toughness of the CFRP composites with the addition of 0.5, 1.0, and 1.5 wt% MWCNTs, respectively. Microstructural investigations using Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) verify that chemical reactions took place between the COOH-MWCNTs and the epoxy resin, supporting the improvements experimentally observed in the interlaminar fracture toughness

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Section: Introductionmentioning

confidence: 99%

Interlaminar Fracture Toughness of CFRP Laminates Incorporating Multi-Walled Carbon Nanotubes

et al. 2015

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“…The sample is casted through hand lay-up technique with the prepared resin system and allowed to cure for more than 48 h at room temperature (25℃). It should be noted that there are many other methods of sample casting such as vacuum resin infusion as done by authors [1–4], but those advanced techniques have not been used in this research since the objective of this paper was to determine the suitability of this sensor methodology as an effective delamination detection technique. Initial delamination in the form of pre-crack required at one end for the modified delaminated DCB sample is introduced by coating the upper surface of the core (just below the lower surface of the face sheet) with 80 µm thick non-stick impermeable Teflon sheet as shown in figure.…”

Section: Materials and Manufacturingmentioning

confidence: 99%

“…In spite of numerous benefits, one of the major problems of these structures is the propensity for interfacial delamination between the face sheet and the core material which may be either due to manufacturing defects or may occur during service (such as a result of some low velocity impact). These interfacial defects might eventually propagate as a result of normal loading conditions which the structure or component might encounter in service (refer to literature by the author [1–4] as well as literature cited within those papers). Therefore, there is a need to track interfacial delaminations in real time, while the structural component is in service.…”

Section: Introductionmentioning

confidence: 99%

Interfacial delamination in glass-fiber/polymer-foam-core sandwich composites using singlemode–multimode–singlemode optical fiber sensors: Identification based on experimental investigation

Mitra

Patra

Singh

et al. 2017

Jnl of Sandwich Structures & Materials

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Identification of interfacial delamination in the glass fiber/polymer-foam-core sandwich composites is difficult if the delamination does not propagate to the side surface of the specimen. However, these damages may eventually lead to compromising the sandwich composite structural component. A cost-effective novel embedded fiber optic sensor is being proposed in this manuscript, which works on the principle of multimode interference, to perform distributed sensing of interfacial delamination within the sandwich composites while in service. Even though this easy to use methodology has been used to identify interfacial delamination, this methodology can also be used for different other types of interfacial/interlaminar distributed strain sensing of samples under mechanical as well as thermal loads.

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“…[21] Matrix modification by adding a proper amount of nano or micro particles can significantly improve the overall properties of the composites. [22][23][24][25][26] Prasad et al discussed the effect of nano TiO 2 particles on interlaminar toughness of flax fiber-reinforced epoxy resin composites and observed that the mode I and mode II interlaminar fracture toughness values improved by 52% and 73%, respectively. [27] A study conducted by Arca observed that the maximum improvement in the mode I and mode II interlaminar fracture toughness values were 25% and 10%, respectively, with the 3 wt% CNT reinforcement addition.…”

Section: Introductionmentioning

confidence: 99%

Investigation of toughening effect of biomass‐derived SiCB on basalt fiber‐reinforced unsaturated polyester composites

2020

Polymer Composites

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Fiber-reinforced polymer composites are outstanding lightweight structural materials, so that they are widely used in automotive, marine, medical, defense, and aerospace fields. However, when subjected to structural loads, they are prone to failure due to their inherent brittleness and the susceptibility to delamination, which can lead to the loss of the load-bearing capacity of composite materials. This article proposes an effective solution of innovatively using the silicon carbon black, a kind of sustainable green biomass material derived from rice husks, to toughen the composites. When the content of silicon carbon black (SiCB) added to the composites is 1.5 wt%, the maximum values of flexural strength, bending energy absorption, and the mode II interlaminar fracture toughness values are 333 MPa, 6.10 J, and 1591 J/m 2 , respectively, corresponding to the improvement percentage of 138%, 120%, and 216%. The addition of SiCB significantly improved the bending properties and the mode II interlaminar fracture toughness of composites. The toughening mechanisms of SiCB were studied based on the fracture surface morphologies of the composites.

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Interface fracture of sandwich composites: Influence of MWCNT sonicated epoxy resin

Cited by 48 publications

References 46 publications

Interlaminar Fracture Toughness of CFRP Laminates Incorporating Multi-Walled Carbon Nanotubes

Interlaminar Fracture Toughness of CFRP Laminates Incorporating Multi-Walled Carbon Nanotubes

Interfacial delamination in glass-fiber/polymer-foam-core sandwich composites using singlemode–multimode–singlemode optical fiber sensors: Identification based on experimental investigation

Investigation of toughening effect of biomass‐derived SiCB on basalt fiber‐reinforced unsaturated polyester composites

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