Strain rate sensitivity of toughened epoxy

Chaudhary, Saurabh; Iqbal, Nahid; Mangla, Vikas; Kumar, Devendra; Roy, Prasun Kumar

doi:10.1007/s13726-015-0375-7

Cited by 11 publications

(7 citation statements)

References 38 publications

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“…4(a)). In general, the lower compressive strength of microballoons (41 MPa) in comparison to neat epoxy (138 MPa) 19 is expected to result in a reduction of compressive strength, which is very well evidenced from our studies (Fig. 4(b)).…”

Section: Mechanical Properties 341 Quasi-static Testingsupporting

confidence: 86%

“…The effect of increasing strain rates on the compressive behaviour of syntactic foam was quantified using Split Hopkinson Pressure bar setup, which consists of input and output bar sandwiching a short specimen 26,27 . The details of the setup are presented in the published paper 19 . Pressurised air propels a projectile, which strikes at one end of the input bar.…”

Section: High Strain-rate Studiesmentioning

confidence: 99%

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Epoxy-glass Microballoon Syntactic Foams for Blast Mitigating Applications

et al. 2018

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Polymeric syntactic foams refer to a class of cellular material created using preformed hollow spheres bound together with a polymeric matrix. These cellular materials possess exceptional ability to respond against high impact dynamic loads. This paper is an attempt to fabricate polymeric syntactic foams of epoxy containing hollow glass microballoon at varying loading (40 % - 60 %) and explore their potential towards blast mitigation. The tensile, compressive and flexural strength were found to be inversely proportional to the microballoon loading in the quasi-static regime. The strain rate sensitivity of the foams was confirmed by performing high strain rate studies using split hopkinson pressure bar. The flow stress of these foams was found to increase with increasing strain rates. The syntactic foams were subjected to controlled transient blast loadings using a shock tube. The samples remained intact and no strain was observed on the strain gauge, even under a blast load of ~ 90 psi, which clearly highlight their potential as core materials for blast mitigating applications.

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Section: Mechanical Properties 341 Quasi-static Testingsupporting

confidence: 86%

Section: High Strain-rate Studiesmentioning

confidence: 99%

Epoxy-glass Microballoon Syntactic Foams for Blast Mitigating Applications

et al. 2018

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

confidence: 99%

“…Compressive strength, at different filler weight contents and strain rates of PP/S, [112] PP/ZnO, [57] E/S, [113] E/ GO, [114] E/CNT, [115] PE/GNP, [116] PE/C, [117] E/PS, [118] and PE/SD. [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.…”

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

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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“…High strain rate loading and silica particles restrict the molecular mobility of the epoxy matrix and result in a stiffer dynamic response [13][14][15][16][17][18]. The weight fraction, size, and distribution of silica particles affect the epoxy dynamic stiffness.…”

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confidence: 99%