Study on static and dynamic mechanical properties and fracture mechanism of cenospheres

WANG Zhuangzhuang; XU Peng; FAN Zhiqiang; MIAO Yuzhong; GAO Yubo; NIE Taoyi

doi:10.11883/bzycj-2019-0337

Volume 40 Issue 6

Jun. 2020

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WANG Zhuangzhuang, XU Peng, FAN Zhiqiang, MIAO Yuzhong, GAO Yubo, NIE Taoyi. Study on static and dynamic mechanical properties and fracture mechanism of cenospheres[J]. Explosion And Shock Waves, 2020, 40(6): 063101. doi: 10.11883/bzycj-2019-0337

Citation:

WANG Zhuangzhuang, XU Peng, FAN Zhiqiang, MIAO Yuzhong, GAO Yubo, NIE Taoyi. Study on static and dynamic mechanical properties and fracture mechanism of cenospheres[J]. Explosion And Shock Waves, 2020, 40(6): 063101. doi: 10.11883/bzycj-2019-0337

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Study on static and dynamic mechanical properties and fracture mechanism of cenospheres

doi: 10.11883/bzycj-2019-0337

School of Science, North University of China, Taiyuan 030051, Shanxi, China

Received Date: 2019-08-30
Rev Recd Date: 2020-03-03

Available Online: 2020-05-25

Publish Date: 2020-06-01

Abstract

Abstract

To investigate the mechanical properties of brittle hollow particles (BHPs) under impact loading, Quasi-static and dynamic compressive tests were conducted on fly ash cenospheres (CPs) with two different particle size graduations. The breakage rate and fracture mechanism of the cenospheres and their effects on the strain rate sensitivity of the cenospheres accumulation were discussed based on the single loading experiments, which were implemented by limiting the compression strain of the particles accumulation to 50%. The results are as follows. (1) The dynamic strength of cenosphere materials was significantly enhanced as compared to the quasi-static compression results. In the strain rate range of 0.001-150 s⁻¹, the strength of the cenosphere accumulations with large and small average particle sizes (marked LGs and LTs) increased by 200% and 195%, respectively. The strength of LGs and LTs increased 39% and 51.5% with the strain rate increased from 150 s⁻¹ to 300 s⁻¹. However, when the strain rate increased to 800 s⁻¹, no obvious change on the strength of both LGs and LTs were observed. (2) At the same loading rate, the strength and energy absorption of particle accumulation with smaller average size were35%～40% and 35%～48% higher than that containing larger particles. (3) According to the particle fragments size distribution analysis, the broken rate of the particle accumulation and the broken severity of single particle both increased with the loading rate. In addition, the broken rate of LGs was higher than that of LTs at the same loading rate. (4) Based on Hardin fracture potential analysis, it can be concluded that the relative breaking potential of particles decreases with the increase of impact velocity under unit input energy, and the energy utilization rate for particle breaking decreases under dynamic impact, which leads to higher energy dissipation and stress level of materials under the same compression amount, namely, the macroscopic strain rate effect.
- cenospheres,
- brittle hollow particles,
- mechanical properties,
- broken rate,
- strain rate effect

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References(17)

References

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