High strain rate behavior of graphene-epoxy nanocomposites

Çolak, Özgen Ü.; Bahlouli, Nadia; Uzunsoy, Deniz; Francart, Charles

doi:10.1016/j.polymertesting.2019.106219

Cited by 34 publications

(36 citation statements)

References 20 publications

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“…Time for rearrangement of polymer chains is less during the high strain rates. Since the fundamental process of yielding of amorphous polymers consists of the jump of macromolecule segments from one equilibrium position to another [32], at a higher strain rate, there is a higher molecular resistance to jumps and, hence, a higher yield stress is observed [33]. Almost rate independent behavior is observed during loading and unloading in the grapheneepoxy nanocomposite.…”

Section: Mechanical Characterization Of Epoxy and Graphene-epoxy Nanocomposite 31 Quasi Static Compression Testsmentioning

confidence: 98%

Experimental investigation of oligo cyclic compression behavior of pure epoxy and graphene-epoxy nanocomposites

et al. 2020

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The loading-unloading compression behavior and the oligo cyclic behavior of pure epoxy and graphene-epoxy nanocomposites are investigated since the systematic evaluation of the mechanical behavior under cyclic loading is of great importance in the development of damage characterization and fatigue models for polymer composites. High purity graphene nanoflakes (GNF) are synthesized by electric arc discharge method and the manufacturing of graphene epoxy nanocomposites is done using solution blending. The structural characterizations of produced GNF are performed using several techniques such as transmission electron microscopy (TEM), Raman spectroscopy, Brunauer-Emmett-Teller (BET). Oligo quasi static strain controlled cyclic tests are performed at the elastic (or viscoelastic) region, around yield and after softening at the viscoplastic region. Comparing the behavior under compression loading-unloading and oligo (repeated) cycled reveals that prehistory does not have much effect on the subsequent behavior. The change in the elasticity modulus during repeated cyclic compression is determined. It is observed that elasticity modulus decreases initially, then it progressively increases with the increase of applied maximum strain. Compared to epoxy, the yield stresses of graphene-epoxy decrease in both strain rates and a small increase in the elasticity modulus of graphene-epoxy is observed at low strain rate (1.E-4 /s).

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Section: Mechanical Characterization Of Epoxy and Graphene-epoxy Nanocomposite 31 Quasi Static Compression Testsmentioning

confidence: 98%

Experimental investigation of oligo cyclic compression behavior of pure epoxy and graphene-epoxy nanocomposites

et al. 2020

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“…[119] C, clay; E, epoxy; GO, graphene oxide; GNP, graphene nanoplatelets; PE, polyethylene; PP, polypropylene; PS, polystyrene microspheres; S, silica; SD, sawdust; ZnO, zinc oxide F I G U R E 1 4 Compressive modulus (measured at a strain rate of 10 3 s À1 ), at different filler weight content of PP/S, [112] PP/ ZnO, [57] E/GO, [114] PE/C, [117] E/PS, [118] and PE/SD, [119] and E/GNP. [120] C, clay; E, epoxy; GO, graphene oxide; GNP, graphene nanoplatelets; PE, polyethylene; PP, polypropylene; PS, polystyrene microspheres; S, silica; SD, sawdust; ZnO, zinc oxide the strength of the particle-matrix interfacial bonding strength is more important than the quality of the particle dispersion, in terms of an enhancement in mechanical properties. [148,149] Indeed, as the silica concentration decreases, the reinforcing effect on PA6 mechanical performance is less pronounced, even though the filler is better dispersed.…”

Section: Dynamic Mechanical Performance Of Composites 41 | Polymers Filled With Particlesmentioning

confidence: 99%

“…Compressive modulus (measured at a strain rate of 10 3 s −1 ), at different filler weight content of PP/S, [ 112 ] PP/ZnO, [ 57 ] E/GO, [ 114 ] PE/C, [ 117 ] E/PS, [ 118 ] and PE/SD, [ 119 ] and E/GNP. [ 120 ] C, clay; E, epoxy; GO, graphene oxide; GNP, graphene nanoplatelets; PE, polyethylene; PP, polypropylene; PS, polystyrene microspheres; S, silica; SD, sawdust; ZnO, zinc oxide…”

Section: Dynamic Mechanical Performance Of Compositesmentioning

confidence: 99%

High‐strain‐rate mechanical performance of particle‐ and fiber‐reinforced polymer composites measured with split Hopkinson bar: A review

2021

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Reinforcing polymers with particles and fibers has been a common strategy for decades, in order to make them suitable for high-demanding industrial applications. As composites often undergo dynamic loads, it is important to understand their behavior under such conditions. This review first classifies the types of polymer composites and then explains their failure behavior under tension and compression loading, followed by an overview of some of the experimental procedures used to characterize the polymer composites' dynamic mechanical performance. Afterward, the most significant findings in terms of the highstrain-rate compressive and tensile strength and modulus of polymer composites are thoroughly discussed. The results, available in the literature, on the mechanical properties of polymer composites under quasi-static conditions are also presented and compared with the high-strain-rate data. The differences are explained by discussing the changes in the structural configurations of polymer matrices under quasi-static and dynamic loads. Lastly, conclusions and future perspectives are given, with the intent of highlighting the most promising polymer composites that can be used for a wide variety of applications.

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“…With its superior mechanical 1 thermal, 2 and electrical 3 properties, graphene is a nanomaterial that has attracted interest in recent years as a reinforcement element in polymer nanocomposites widely employed in aerospace, military, and automotive industry applications 4 . Many experimental studies on the production and characterization of graphene‐polymer (GP) nanocomposites that exhibit viscoelastic and viscoplastic material behavior have been conducted, and it is well understood that the material behavior of nanocomposites is dependent on the strain rate 5,6 temperature 7,8 amount of graphene by weight, 9,10 production method 11,12 and graphene agglomeration in the matrix 13 . The increasing demand for the use of GP nanocomposites in various applications requires the determination of material behavior by modeling as well as experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Simplified cooperative viscoplasticity theory based on overstress model for nanocomposites

Bakbak

Çolak

2022

J of Applied Polymer Sci

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Cooperative‐viscoplasticity theory based on overstress (C‐VBO) theory proposed to cover the total time, temperature, and graphene fraction dependent mechanical behavior of the nanocomposite material is simplified in this work. The previous version of the VBO model for nanocomposites includes the agglomeration effect of nanofiller by dividing the polymer nanocomposite into two parts as “agglomerated” and “effective matrix” phases. In this work, to be able to define the behavior of nanocomposites when nanofiller is evenly distributed into the matrix, the material model is simplified by defining the bulk and shear modulus without agglomerated and effective matrix phases and they are calculated separately using the Mori‐Tanaka homogenization scheme. The capabilities of the modified C‐VBO model for nanocomposites are investigated by simulating rate‐dependent uniaxial compression, creep, and relaxation behaviors for different graphene fractions (0.1 and 0.5 wt.%). In addition, to investigate high strain rate behavior, Split Hopkinson pressure bar tests are performed. The adiabatic heating effect that occurs at high strain rates is taken into account and incorporated into the model. All behaviors mentioned above are simulated well by simplified C‐VBO for nanocomposites. The developed constitutive model is ready to implement into finite element codes to be used in the structural analysis.

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High strain rate behavior of graphene-epoxy nanocomposites

Cited by 34 publications

References 20 publications

Experimental investigation of oligo cyclic compression behavior of pure epoxy and graphene-epoxy nanocomposites

Experimental investigation of oligo cyclic compression behavior of pure epoxy and graphene-epoxy nanocomposites

High‐strain‐rate mechanical performance of particle‐ and fiber‐reinforced polymer composites measured with split Hopkinson bar: A review

Simplified cooperative viscoplasticity theory based on overstress model for nanocomposites

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