Behaviour of Epoxy Silica Nanocomposites Under Static and Creep Loading

Constantinescu, Dan Mihai; Picu, Catalin R.; Sandu, Marin; Apostol, Dragoş Alexandru; Sandu, Adriana; Baciu, Florin

doi:10.1515/aucts-2017-0001

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…through nano indentation relaxation tests [ 31 ] and by Charlet through repeated loading tests [ 34 ]. This, along with the innate viscous behavior of a plastic matrix, such as epoxy [ 35 ], produce a composite which inherits a similar response. The mechanisms leading to a viscous response are related to the amorphous polymer chains motion of both the composite and the fiber matrix in the direction of stress, when specific activation energies are reached [ 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Response of Epoxy Resin—Flax Fiber Composites Subjected to Repeated Loading and Creep Recovery Tests

2023

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Flax fiber-reinforced plastics have an innate eco-friendly nature due to the fiber reinforcement and reduced energy requirements in fabrication when compared to current fiber reinforced composite materials. They possess a complex time-dependent material behavior, which is investigated in the present paper. A composite material with flax fiber reinforcement on the load direction, embedded in an epoxy resin matrix, was studied. The procedures used were tensile tests, repeated loading-recovery, and creep-recovery tests, which were meant to expose the components of the response with respect to stress level and load duration. The results showed an elastic bi-linear behavior, a yield point at approximately 20% of the ultimate tensile stress, and tensile moduli of 35.9 GPa and 26.3 GPa, before and after yield. This is coupled with significant non-linear viscoelastic and, after yield, viscoplastic components, accounting for up to 14% of the strain response. The behavior is inherited from both the matrix and the fiber reinforcement and is attributed to the amorphous nature of the matrix combined with the microstructural re-organization of the fiber under load, which are partially reversible.

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Section: Introductionmentioning

confidence: 99%

Mechanical Response of Epoxy Resin—Flax Fiber Composites Subjected to Repeated Loading and Creep Recovery Tests

2023

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“…Both MWNT and GPL lead to a dramatic reduction of crack growth rate under fatigue conditions [2]. For static testing the strength and toughness properties of different nanocomposites with an epoxy-based matrix were already reported [3,4].…”

Section: Introductionmentioning

confidence: 99%

Advances on the Manufacturing Process of Nanocomposites with MWNT and Nanopowders

Cosmoiu

Apostol

Constantinescu

et al. 2015

AMM

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Epoxy-based nanocomposites with multi-wall carbon nanotubes (MWNT) and nanopowders were fabricated and subjected to monotonic uniaxial testing. Three procedures used to fabricate these nanocomposites are presented, as the dispersion of the MWNTs and nanopowders in the epoxy matrix is a significant challenge. Optical microscopy is used to observe the degree of mixing of the nanofillers in the resin. The inclusion of MWNT and nanopowders don't affect significantly the static properties, but lead to a slight increase of the strength and stiffness of the nanocomposite relative to the neat epoxy.

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Post-creep residual tensile properties of multi-walled carbon nanotube/epoxy nanocomposites

Kordzangeneh,

Khoramishad,

Fatolahi

2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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Epoxy resin as a thermoset polymer is vulnerable to creep loading even at room temperature due to its viscoelastic nature. This study investigated the effect of reinforcing epoxy resin with different functionalized multi-walled carbon nanotubes (MWCNT) contents on the creep response and post-creep residual tensile properties of nanocomposites. The creep tests were performed on the nanocomposite specimens containing different filler contents and the neat epoxy specimen at 40°C under a constant load level of 200 N. It was found that the nanocomposites containing 0.3 wt% MWCNTs experienced 29.6%, 69.1%, and 74.1% decreases in the elastic strain, creep strain, and steady-state creep strain rate, respectively, compared to the neat epoxy. Furthermore, the tensile strength and stiffness of the neat epoxy and nanocomposite specimens were evaluated before and after a partial creep test (at a load level of 200 N for 150 min) by conducting tensile tests. The nanocomposites containing 0.3 wt% MWCNTs demonstrated considerable improvements of 35.9%, 41.2%, 27.9%, and 28.1% in strength, residual strength, stiffness, and residual stiffness, respectively, compared to the neat epoxy. Furthermore, scanning electron microscopy assessment was utilized to investigate the fracture surfaces of the nanocomposite specimens.

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Behaviour of Epoxy Silica Nanocomposites Under Static and Creep Loading

Cited by 3 publications

References 8 publications

Mechanical Response of Epoxy Resin—Flax Fiber Composites Subjected to Repeated Loading and Creep Recovery Tests

Mechanical Response of Epoxy Resin—Flax Fiber Composites Subjected to Repeated Loading and Creep Recovery Tests

Advances on the Manufacturing Process of Nanocomposites with MWNT and Nanopowders

Post-creep residual tensile properties of multi-walled carbon nanotube/epoxy nanocomposites

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