漂珠颗粒材料静动态力学性能与破碎机理研究

王壮壮; 徐鹏; 范志强; 苗雨中; 高玉波; 聂韬译

doi:10.11883/bzycj-2019-0337

漂珠颗粒材料静动态力学性能与破碎机理研究

doi: 10.11883/bzycj-2019-0337

中北大学理学院，山西太原 030051

基金项目: 国家自然科学基金(11602233, 11702257)；山西省青年基金(201701D221018)；山西省高校科技创新项目(2019-520)

详细信息

作者简介:
王壮壮（1994－　），男，硕士，2519041086@qq.com

通讯作者:
范志强（1989－　），男，博士，副教授，fanzhq@nuc.edu.cn

中图分类号: O347.4
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- 被引次数: 0
出版历程
- 收稿日期: 2019-08-30
- 修回日期: 2020-03-03
- 网络出版日期: 2020-05-25
- 刊出日期: 2020-06-01

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

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

摘要

摘要: 为考察脆性空心颗粒材料冲击载荷下的力学特性，以具有不同粒径分布的粉煤灰漂珠为研究对象，对其静动态力学性能进行实验研究。通过限制颗粒材料压缩应变为50%，分析颗粒破碎率和破碎机理与材料宏观应变率效应的关系。结果表明：（1）不同粒径的漂珠颗粒材料在动态压缩下较准静态压缩下颗粒材料的强度均有明显的增强，在0.001和150 s⁻¹大小颗粒的强度分别提高200%和195%，在150和300 s⁻¹大小颗粒的强度分别提高39%和51.5%，在300和800 s⁻¹大小颗粒的强度并未发生明显的变化；（2）在相同加载速度下粒径较小的颗粒比大粒径颗粒的强度和吸能效果分别提高35%～40%和35%～48%；（3）对破碎后颗粒粒径分布曲线分析可知，随着加载速度的增加，大小颗粒的破碎率和破碎程度都会增大，且在相同加载速度下大颗粒的破碎率较小颗粒的破碎率高；（4）Hardin破碎势分析表明，单位输入能量下颗粒的相对破碎势随冲击速度增大而减小，动态冲击下用于颗粒破碎的能量利用率降低，从而导致材料在相同压缩量下产生更高的能量耗散和应力水平，即表现为宏观的应变率效应。
- 漂珠 /
- 脆性空心颗粒 /
- 力学性能 /
- 破碎率 /
- 应变率效应
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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图 1 漂珠形貌

Figure 1. Morphologies of cenospheres

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图 2 漂珠扫描电镜图样

Figure 2. SEM Morphology of cenospheres

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图 3 漂珠碎片形貌

Figure 3. Morphology of cenospheres fragment

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图 4 实验装置（单位：mm）

Figure 4. Experimental facility (unit: mm)

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图 5 LTs与LGs的工程应力应变曲线

Figure 5. Stress-strain curves of LTs and LGs

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图 6 漂珠压缩后颗粒碎片分布

Figure 6. Particle fragment distribution after cenospheres compression

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图 7 不同应变率下颗粒破碎级配曲线

Figure 7. Grain broken gradation curves under different strain rates

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图 8 LGs与LTs应力应变曲线

Figure 8. Stress strain curves of LGs and LTs

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图 9 不同应变率下的强度对比

Figure 9. Strength of cenospheres at different strain rates

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图 10 不同应变率下的颗粒破碎率

Figure 10. Particle breakage rate under different strain rates

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图 11 不同应变率下的能量吸收

Figure 11. Energy absorption at different strain rates

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图 12 破碎势示意图

Figure 12. Schematic diagram of broken potential

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图 13 LTs和LGs动静态下的破碎势分析

Figure 13. Analysis of broken potential under dynamic and static conditions of LTs and LGs

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表 1 粉煤灰漂珠破碎势

Table 1. Cenospheres breaking potential

颗粒大小	应变率/s⁻¹	B_p	B_t	B_r	输入总能量/J	单位能量相对破碎势/J⁻¹
LGs	0.001	0.826	0.430	0.520	4.610	0.113
	150		0.490	0.593	10.600	0.056
	300		0.530	0.642	11.670	0.055
	800		0.530	0.641	11.630	0.055
LTs	0.001	0.476	0.237	0.497	6.085	0.082
	150		0.268	0.562	14.770	0.038
	300		0.294	0.617	17.062	0.036
	800		0.290	0.609	17.170	0.036

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