Effects of strain rate on mechanical properties of nanosilica/epoxy

Miao, Yaping; Liu, Hong-Yuan; Suo, Tao; Mai, Yiu‐Wing; Xie, Fei; Li, Yulong

doi:10.1016/j.compositesb.2016.04.008

Cited by 47 publications

(24 citation statements)

References 20 publications

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“…Chemical crosslinking sites works as a hard phase to reinforce polymer stiffness and strength during deformation, along with both physical entanglement of chains and strain‐induced crystallization . As demonstrated from the investigations of nano silica and Fe 3 O 4 particles reinforcement, when hard particles are more than the matrix in aspect of elastic modulus by three times, they behave nearly same with few differences in reinforcement effect . Hence, they are modeled in unit cell with the mechanical properties of inclusion triple of the matrix, whose original stress strain curves are shown in Figure A.…”

Section: Resultsmentioning

confidence: 99%

“…The unit cell method works as a widely‐used representative volume element method, and it is extensively applied to investigate possible deformation mechanisms for composites. As the literatures reported, it works excellently in investigating mechanical mechanisms of composites, like the potential mechanisms for Mullins effect of rubber‐matrix composites, metal‐matrix composites, thermo‐mechanic characteristics of nanocomposites and particle reinforcement dependence for epoxy . Thereby, two‐dimension unit cell modeling is introduced to investigate deformation mechanism of strain hardening ratio for TPU.…”

Section: Resultsmentioning

confidence: 99%

“…As depicted in Figure , an axial symmetry model is built where a periodic boundary condition is applied on mother line BC . With the aid of the periodic boundary condition, the boundary BC deforms always in parallel with its original line.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Miao

2020

Polymer Engineering & Sci

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The uniaxial tension experiments are performed on thermoplastic polyurethane to investigate its mechanical behaviors and related potential mechanisms, and the loading strain rate is designing to be wide ranging from 0.0001 to 1 s −1 . It is found that the polyurethane presents an obvious rate-dependence, and the stress strain curves share distinct strain hardening characteristics under the investigated strain rates. Furthermore, the strain hardening ratios are sharing nearly same trends and appear to be influenced by both strain rate and the induced adiabatic heating. Besides, the ratio is also strain-dependent on previous loading history. Then, a two-dimension unit cell model is built to investigate potential equivalent mechanisms, of which the hard phase as inclusion is equivalent with crystallization zone, crosslinking sites, and so forth. The simulation results facilitate to explain the distinct strain hardening ratios, even for the matrix from the extrapolated curves under super-low strain rate loading. Finally, the analogic mechanisms of equivalent hard inclusions are proposed, which can reasonably explain the strain rate-and strain-dependence characteristics of polyurethane mechanical behaviors. K E Y W O R D Smechanical properties, polyurethane, strain hardening ratio, structure-property relations, tension

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Miao

2020

Polymer Engineering & Sci

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“…However, jute/PP composites display linear behavior before entering the plastic region. Then the jute/PP composites break abruptly [32,33]. It is clearly shown that the tensile strength and tensile modulus of carpet composites were lower than that of jute/PP composites.…”

Section: Reinforcement Effect Of Different Carpets On the Mechanical mentioning

confidence: 96%

Acoustical and mechanical properties of thermoplastic composites from discarded carpets

Pan

Zhao

et al. 2016

Composites Part B: Engineering

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Without additional matrix or reinforcement, compression molded composites from waste polypropylene (PP) carpets/nylon (PA) carpets or PP carpets/polyester (PET) carpets have higher mechanical properties and sound absorption than traditional jute/PP composites. Large amount of carpets have been discarded every year, leading to waste of petro-based materials and serious environmental pollution. Fabrication of composites from discarded carpets via compression molding could save petroleum resources and alleviate environmental pressure. In this research, the compression molded composites from waste PP/PA carpets or PP/PET carpets showed good mechanical properties, sound absorption and water stability. Compared to the jute/PP composites, nylon 6,6 (PA66)/PP carpet composites had 37% and 9% higher flexural strength and impact resistance, as well as 45% and 10% higher sound absorption and water stability, indicating their potential for transportation and construction industries.

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“…Miao et al [18] and Tian et al [19] reported that silica nanoparticles stiffen and strengthen epoxy composites at both quasi-static and dynamic loading. Silica nanoparticles stiffen epoxy efficiently at low-strainrate loading [19].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Yohanes

Sekiguchi

2018

J. dynamic behavior mater.

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Dynamic stiffness and damping of epoxy adhesives are critical for ensuring the safety, reliability, and comfort of structures subjected to vibrations and impact loads. This study conducts split Hopkinson pressure bar (SHPB) tests to investigate the synergistic effects of silica micro-nanoparticles on these critical properties. Micro-nanoparticle content and composition ratio purity are varied at 2, 5, and 10% by weight (wt%) and from 0% (pure microparticles) to 100% (pure nanoparticles), respectively. Positive simultaneous stiffening and energy absorption effects are observed at a silica content of 5 wt% owing to improved nanoparticle dispersion; this increases the interface area and induces cooperative matrix-filler interactions. At this silica content and a composition ratio of 50%, stiffness and damping are 45 and 40% larger than those of neat epoxy, respectively. Silica micro-nanoparticles are less effective in improving particle dispersion at more than 5 wt%. Conventional mechanical dispersion is limited to applications below a certain silica content; the results suggest a simple, low-cost dispersion technique as an alternative to the in-situ technique and provide options for designing epoxy stiffness and damping appropriate for specific applications.

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Effects of strain rate on mechanical properties of nanosilica/epoxy

Cited by 47 publications

References 20 publications

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Acoustical and mechanical properties of thermoplastic composites from discarded carpets

Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

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