Effects of strain rate on mechanical properties of nanosilica/epoxy

Ying Gang Miao; Hong Yuan Liu; Tao Suo; Yiu Wing Mai; Fa Qin Xie; Yu Long Li

doi:10.1016/j.compositesb.2016.04.008

Effects of strain rate on mechanical properties of nanosilica/epoxy

Ying Gang Miao, Hong Yuan Liu, Tao Suo, Yiu Wing Mai, Fa Qin Xie, Yu Long Li

Research output: Journal article publication › Journal article › Academic research › peer-review

51 Citations (Scopus)

Abstract

The mechanical properties (i.e., stress-strain relationship and peak stress) of nanosilica filled epoxies were studied using an Instron machine and a split Hopkinson pressure bar apparatus over a range of strain rates from 8 × 10^-4 s^-1 up to ∼5 × 10³ s^-1 under uniaxial compression. It was found that the nanosilica particles only reinforce epoxies slightly under both quasi-static and dynamic loading conditions. With a unit cell model, it was observed that owing to the existence of nanosilica, the surrounding strain field was changed and the strain-softening characteristics of the epoxy introduced a negative effect of the nanosilica particles as a reinforcement agent. That is, the particle strengthening effect depended on the mechanical characteristics of epoxy matrix. This was further confirmed by numerically simulating the mechanical behaviors of the composites for which (a) the matrix might assume different strain-softening or strain-hardening characteristics and (b) there were higher loadings of rigid silica particles.

Original language	English
Pages (from-to)	119-124
Number of pages	6
Journal	Composites Part B: Engineering
Volume	96
DOIs	https://doi.org/10.1016/j.compositesb.2016.04.008
Publication status	Published - 1 Jul 2016
Externally published	Yes

Keywords

A. Particle-reinforcement
B. Impact behaviour
C. Finite element analysis (FEA)
D. Mechanical testing
Reinforcement mechanism

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.compositesb.2016.04.008

Cite this

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title = "Effects of strain rate on mechanical properties of nanosilica/epoxy",

abstract = "The mechanical properties (i.e., stress-strain relationship and peak stress) of nanosilica filled epoxies were studied using an Instron machine and a split Hopkinson pressure bar apparatus over a range of strain rates from 8 × 10-4 s-1 up to ∼5 × 103 s-1 under uniaxial compression. It was found that the nanosilica particles only reinforce epoxies slightly under both quasi-static and dynamic loading conditions. With a unit cell model, it was observed that owing to the existence of nanosilica, the surrounding strain field was changed and the strain-softening characteristics of the epoxy introduced a negative effect of the nanosilica particles as a reinforcement agent. That is, the particle strengthening effect depended on the mechanical characteristics of epoxy matrix. This was further confirmed by numerically simulating the mechanical behaviors of the composites for which (a) the matrix might assume different strain-softening or strain-hardening characteristics and (b) there were higher loadings of rigid silica particles.",

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AU - Miao, Ying Gang

AU - Liu, Hong Yuan

AU - Suo, Tao

AU - Mai, Yiu Wing

AU - Xie, Fa Qin

AU - Li, Yu Long

PY - 2016/7/1

Y1 - 2016/7/1

N2 - The mechanical properties (i.e., stress-strain relationship and peak stress) of nanosilica filled epoxies were studied using an Instron machine and a split Hopkinson pressure bar apparatus over a range of strain rates from 8 × 10-4 s-1 up to ∼5 × 103 s-1 under uniaxial compression. It was found that the nanosilica particles only reinforce epoxies slightly under both quasi-static and dynamic loading conditions. With a unit cell model, it was observed that owing to the existence of nanosilica, the surrounding strain field was changed and the strain-softening characteristics of the epoxy introduced a negative effect of the nanosilica particles as a reinforcement agent. That is, the particle strengthening effect depended on the mechanical characteristics of epoxy matrix. This was further confirmed by numerically simulating the mechanical behaviors of the composites for which (a) the matrix might assume different strain-softening or strain-hardening characteristics and (b) there were higher loadings of rigid silica particles.

AB - The mechanical properties (i.e., stress-strain relationship and peak stress) of nanosilica filled epoxies were studied using an Instron machine and a split Hopkinson pressure bar apparatus over a range of strain rates from 8 × 10-4 s-1 up to ∼5 × 103 s-1 under uniaxial compression. It was found that the nanosilica particles only reinforce epoxies slightly under both quasi-static and dynamic loading conditions. With a unit cell model, it was observed that owing to the existence of nanosilica, the surrounding strain field was changed and the strain-softening characteristics of the epoxy introduced a negative effect of the nanosilica particles as a reinforcement agent. That is, the particle strengthening effect depended on the mechanical characteristics of epoxy matrix. This was further confirmed by numerically simulating the mechanical behaviors of the composites for which (a) the matrix might assume different strain-softening or strain-hardening characteristics and (b) there were higher loadings of rigid silica particles.

KW - A. Particle-reinforcement

KW - B. Impact behaviour

KW - C. Finite element analysis (FEA)

KW - D. Mechanical testing

KW - Reinforcement mechanism

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SN - 1359-8368

VL - 96

SP - 119

EP - 124

JO - Composites Part B: Engineering

JF - Composites Part B: Engineering

ER -

Effects of strain rate on mechanical properties of nanosilica/epoxy

Abstract

Keywords

ASJC Scopus subject areas

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