强介电物质对微波辐射下岩石损伤特性的影响:来自实验和机制的见解

IF 4 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Damage Mechanics Pub Date : 2023-05-03 DOI:10.1177/10567895231171410
F. Gao, Yindong He, Xin-guang Xiong, K. Zhou, Chun Yang
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引用次数: 1

摘要

研究表明,微波预处理可以弱化岩石,减少刀具磨损,提高机械破岩效率。岩石矿物的介电性质是影响岩石吸收微波能力的主要因素,因此对岩石进行改性实验研究以提高岩石的微波吸收能力具有重要意义。为了提高岩石的微波吸收能力,提出了“微波辅助吸收剂”的概念。砂岩试样在微波辐射前先用强介电物质进行预处理,提高其微波吸收能力,然后进行微波场暴露,最后进行单轴压缩试验。微波处理前后的纵波速度、核磁共振和力学性能测试表明,砂岩试样的微波吸收能力有所增强。结果表明,钛酸钡悬浮液和水都是有效的微波助吸剂。钛酸钡悬浮液处理的样品具有较好的微波吸收能力;在5 kW微波功率辐照下,其纵波速度下降14.04%,孔隙率上升25.43%,单轴抗压强度下降24.98%。砂岩试样在充分吸收微波能后,破坏形式由脆性向塑性转变。
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Effect of strong dielectric substances on the damage characteristics of rocks exposed to microwave radiation: Insight from experiments and mechanisms
It has been demonstrated that microwave pretreatment can weaken rocks, reduce tool wear, and improve mechanical rock breaking efficiency. The dielectric properties of rock minerals are a major factor affecting the ability of rocks to absorb microwaves, so it is important to conduct experimental research on rock modification to improve the microwave absorption capacity of rocks. The concept of “microwave-assisted absorbing reagents” has been proposed to increase the microwave absorption capacity of rocks. Sandstone specimens are first pretreated with strong dielectric substances before being exposed to microwave radiation to increase their microwave absorption capacity, then they are exposed to microwave fields and finally conducted to uniaxial compression tests. Enhancement in microwave absorption capacity of sandstone specimens is showed by P-wave velocity, nuclear magnetic resonance, and mechanical tests before and after microwave treatment. The results showed that barium titanate suspension and water are both effective microwave-assisted absorbing agents. The specimens treated with barium titanate suspension exhibited better microwave absorption capacity; in 5 kW microwave power irradiation, its p-wave velocity falls by 14.04%, porosity rises by 25.43%, and uniaxial compressive strength falls by 24.98%. Additionally, the failure form of sandstone specimens changes from brittle to plastic once it has fully absorbed microwave energy.
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来源期刊
International Journal of Damage Mechanics
International Journal of Damage Mechanics 工程技术-材料科学:综合
CiteScore
8.70
自引率
26.20%
发文量
48
审稿时长
5.4 months
期刊介绍: Featuring original, peer-reviewed papers by leading specialists from around the world, the International Journal of Damage Mechanics covers new developments in the science and engineering of fracture and damage mechanics. Devoted to the prompt publication of original papers reporting the results of experimental or theoretical work on any aspect of research in the mechanics of fracture and damage assessment, the journal provides an effective mechanism to disseminate information not only within the research community but also between the reseach laboratory and industrial design department. The journal also promotes and contributes to development of the concept of damage mechanics. This journal is a member of the Committee on Publication Ethics (COPE).
期刊最新文献
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