Abstract
The stress wave attenuation and energy absorption in the coral sand were respectively investigated. A series of experiments were carried out by using a new methodology with an improved split Hopkinson pressure bar (SHPB). Four types of coral sand, i.e., particle sizes of 1.18–0.60 mm, 0.60–0.30 mm, 0.30–0.15 mm, and 0.15–0.075 mm, were carefully sieved and tested. Significant effects of coral sand on stress wave attenuation and energy absorption were observed. Correlation between stress wave attenuation and energy absorption of coral sand was validated. Conclusions on particle size effect of stress wave attenuation and energy absorption, which support each other, were drawn. There existed a common critical stress zone for coral sand with different particle sizes. When the stress below this zone, sand with small particle sizes attenuates stress wave better and absorb energy more; when the stress beyond this zone, sand with larger particle sizes behave better on stress wave attenuation and energy absorption.
Highlights
Sand is a commonly used material in engineering construction, which attributes to its easy availability and cheapness
A study on the effect of particle size of coral sand on stress wave attenuation and energy absorption is meaningful for design and construction of marine engineering
At the distance of 150 mm, coral sand of four particle sizes share a similar D of ~15%, which indicates D of specimens with smaller particles catch up with D of specimens with larger particles after propagating through this distance
Summary
Sand is a commonly used material in engineering construction, which attributes to its easy availability and cheapness. The remarkable ability on stress wave attenuation and energy absorption make the sand appropriate apply to blast mitigation and vibration isolation. Mechanisms of propagation and energy absorption of the stress wave in sand is primary determined by its physical and mechanical properties. Some published literatures [2,3] demonstrated that the particle size exhibited significant influence on the physical and mechanical properties of sand, such as density, porosity, elastic modulus, yield stress, and compressibility. A study on the effect of particle size of coral sand on stress wave attenuation and energy absorption is meaningful for design and construction of marine engineering. To study the effect of particle size of coral sand under impact loads, experiments for coral sand on stress wave attenuation and energy absorption were respectively performed.
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