Theoretical instructions for experimenting controllable Hopkinson pressure bar

Miao, Yaping; Wang, Yongshuai; Du, Wenxuan; He, He; Deng, Qiong; Dou, Qingbo

doi:10.1016/j.polymertesting.2022.107520

Cited by 13 publications

(1 citation statement)

References 29 publications

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“…This exceptional combination of ultra-low density and high absorption capacity makes it suitable for developing packaging materials, particularly in applications requiring resistance to dynamic compression. [36][37][38][39] Furthermore, a static compression test consisting of 60% strain for five cycles was conducted on CNTA20. The results demonstrated the sample's stable resilience, with a stress of ≈6 kPa at a strain of 0.6.…”

Section: Resultsmentioning

confidence: 99%

Half‐Full Filled Aerogels with a 348% Increment in Energy Absorption and a Retained High Electromagnetic Shielding Performance

Kong,

Lv,

et al. 2024

Adv Funct Materials

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Aerogels, as kinetic energy absorbing materials, can find crucial applications for safeguarding in transportation, sports, buildings, construction, and aerospace. However, the highly porous structure makes it extremely fragile for endurance usage. In this study, a half‐full filled structure has been proposed, and the concept has been demonstrated based on shear thickening fluid (STF) and chemically vapor deposited carbon nanotube aerogels (CNTAs), in which the outer part of CNTA is filled with STF while the inner core keeping unfilled. Chemical vapor deposition significantly enhances the elasticity and electromagnetic shielding performance of the native CNTA. The half‐full filled aerogels (HFFA) show a 348% increase in energy absorption compared to the CNTA. At the same time, the density, electronic conductivity, and electromagnetic interference shielding effectiveness (EMI SE) of the HFFAs are 0.117 g cm−3, 1213 S m−1, and 69.52 dB (which is a neglectable reduction of 0.63% compared to native CNTA), respectively. The HFFA strategy provides an alternative route to fabricate robust aerogels with a remarkable increase of target properties while maintaining other properties, such as low density, high pore volume, and conductivity, with limited changes.

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Section: Resultsmentioning

confidence: 99%

Half‐Full Filled Aerogels with a 348% Increment in Energy Absorption and a Retained High Electromagnetic Shielding Performance

Kong,

Lv,

et al. 2024

Adv Funct Materials

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Nanosilica reinforced epoxy under super high strain rate loading

Wu,

Zhang,

Yin

et al. 2024

Polymer Engineering & Sci

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Nanosilica reinforced epoxy‐matrix composites have been extensively investigated for higher mechanical strengths since its emergence, while few literatures are available about enhancement characteristics under super high strain rate loading, which is usually encountered during impact. Hereby, this work investigates the composites containing various kinds of nanosilica subjected to compression of strain rate higher than 20,000 s−1. A series of stress:strain curves are obtained and it is found that peak stresses increase with increasing strain rate along with silica fraction. Excitedly, the silica particle plays another enhancement role in anti‐localization of adiabatic shearing which occurs in pure epoxy, as indicated from abruptly dropped strain‐hardening index at ~22,000 s−1. A mechanism is proposed that uniformly distributed silica delays adiabatic shearing localizations to form through cracks, which is confirmed by fracture surface observance.Highlights Higher strain rate is achieved experimentally up to ~20,000 s−1. Strain rate effect is found on the peak stress of composites. Reinforcement of nanosilica is more distinct on strain‐hardening behavior. Silica particles hinder adjacent shearing localizations from abrupt evolution.

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