Energy absorption mechanism of hydrophobic silica gel particles

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 128-134.

ZHAO Peng1 YU Muchun2 CHEN Qian1

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Abstract

Hydrophobic silica gel is a shock energy absorption buffer medium consisting of water and hydrophobic silica gel particles covered with micro-pores. It is sealed in a compressible hydraulic cylinder to form a hydrophobic silica gel buffer. During impact processes, water molecules invade and escape from hydrophobic micro-pores to realize energy storage, conversion and dissipation. Based on Laplace-Washburn equation and the contact angle hysteresis model, the process of water molecules invading and escaping from hydrophobic micro-pores was studied to establish hydrophobic silica gel’s mechanical model. Quasi-static tests were used to verify this mechanical model, and according to the actually measured force-displacement curve, the energy-dissipating efficiency of hydrophobic silica gel was calculated. The results showed that the theoretical results are better consistent to test ones; hydrophobic silica gel reveals a larger hysteretic phenomenon in loading and unloading processes, it is an ideal energy-absorbing material; if the design is appropriate, hydrophobic silica gel has excellent buffering performance.

Key words

hydrophobic silica particle / hysteresis / buffer

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ZHAO Peng1 YU Muchun2 CHEN Qian1. Energy absorption mechanism of hydrophobic silica gel particles[J]. Journal of Vibration and Shock, 2019, 38(5): 128-134

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