氧化铝薄壁空心颗粒在冷冻条件下的吸波性能

IF 2.1 Q2 ENGINEERING, CIVIL
Pengzhi Yan, Yu Wang, Pengxian Fan, Mingyang Wang
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引用次数: 0

摘要

吸波层的可靠性对于实现防护工程的保护功能至关重要。然而,在土壤季节性冰冻地区,典型的吸波材料--沙子--无法实现其预期的吸波功能。这是因为材料的内部孔隙被冰填满,颗粒冻结。为了解决这个问题,我们选择了氧化铝薄壁空心颗粒作为新的吸波材料。这些颗粒可将气相引入吸收层,而气相对衰减应力波至关重要,并通过劈裂霍普金森棒(SHPB)试验研究了其在冻结条件下的吸波能力。测试数据表明,氧化铝薄壁空心颗粒的密度比沙子小,波阻抗较低,因此能反射更多的入射能量。此外,与沙子相比,这些颗粒对吸收能量的消散能力更强。在冰冻环境下,氧化铝薄壁空心颗粒的平均透射系数仅为普通沙子的 21.95% 到 49.30%。此外,颗粒大小与波浪吸收能力呈正相关。氧化铝薄壁空心颗粒在冲击应力作用下破碎并释放气相的能力大大提高了吸波层在冻结条件下的可压缩性,这也是其吸波效果增强的原因。应力-应变曲线具体表现为曲线更平滑,塑性能量耗散阶段更长。除此之外,材料的动态变形模量和峰值应力较低,而峰值应变较大。这项研究结果为解决季节性冰冻地区吸水层冻害问题提供了一种低成本、高可靠性的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Wave-absorbing performance of alumina thin-walled hollow particles under freezing condition
The reliability of the absorbing layer is crucial for realizing protective engineering’s protection function. However, the typical wave-absorbing material, sand, is unable to fulfill its intended wave-absorbing function in areas with seasonally frozen soil. This is because the internal pores of the material become filled with ice and the particles freeze. To address this issue, alumina thin-walled hollow particles were chosen as a new wave-absorbing material. These particles can introduce the gas phase into the absorbing layer which is essential for attenuating the stress waves and its wave-absorbing capacity under freezing conditions was investigated by the split Hopkinson bar (SHPB) test. According to the test data, the alumina thin-walled hollow particles are less dense than sand and have a lower wave impedance, allowing them to reflect more incident energy. Moreover, these particles have a better capacity for dissipating the absorbed energy, as compared to sand. Under freezing circumstances, the average transmittance coefficient of alumina thin-walled hollow particles is only 21.95% to 49.30% of ordinary sand. Additionally, the particle size positively correlates with the capacity for wave-absorption. The capacity of alumina thin-walled hollow particles to shatter and release the gas phase under impact stress significantly increases the compressibility of the absorbing layer under freezing conditions, which accounts for their enhanced wave-absorbing effectiveness. The stress-strain curve specifically manifests as a smoother curve and a longer stage of plastic energy dissipation. Other than that, the dynamic deformation modulus of the material and peak stress is lower, while the peak strain is larger. The findings of this study provide a low-cost, high-reliability solution to the problem of frost damage in the absorbing layer in regions with seasonal freezing.
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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