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混凝土中常用钢质铁磁纤维在磁场中的行为模拟

Simulations of the Behaviour of Steel Ferromagnetic Fibres Commonly Used in Concrete in a Magnetic Field.

作者信息

Nováková Kateřina, Carrera Kristýna, Konrád Petr, Künzel Karel, Papež Václav, Sovják Radoslav

机构信息

Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic.

Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic.

出版信息

Materials (Basel). 2021 Dec 24;15(1):128. doi: 10.3390/ma15010128.

DOI:10.3390/ma15010128
PMID:35009279
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8745836/
Abstract

The efficiency of fibre reinforcement in concrete can be drastically increased by orienting the fibres using a magnetic field. This orientation occurs immediately after pouring fresh concrete when the fibres can still move. The technique is most relevant for manufacturing prefabricated elements such as beams or columns. However, the parameters of such a field are not immediately apparent, as they depend on the specific fibre reaction to the magnetic field. In this study, a numerical model was created in ANSYS Maxwell to examine the mechanical torque acting on fibres placed in a magnetic field with varying parameters. The model consists of a single fibre placed between two Helmholtz coils. The simulations were verified with an experimental setup as well as theoretical relationships. Ten different fibre types, both straight and hook-ended, were examined. The developed model can be successfully used to study the behaviour of fibres in a magnetic field. The fibre size plays the most important role together with the magnetic saturation of the fibre material. Multiple fibres show significant interactions.

摘要

通过使用磁场使纤维定向，可以大幅提高混凝土中纤维增强的效率。这种定向在浇筑新鲜混凝土后立即发生，此时纤维仍可移动。该技术对于制造梁或柱等预制构件最为适用。然而，这种磁场的参数并非一目了然，因为它们取决于纤维对磁场的特定反应。在本研究中，在ANSYS Maxwell中创建了一个数值模型，以研究作用于置于具有不同参数磁场中的纤维的机械扭矩。该模型由置于两个亥姆霍兹线圈之间的单根纤维组成。通过实验装置以及理论关系对模拟进行了验证。研究了十种不同类型的纤维，包括直纤维和带钩端的纤维。所开发的模型可成功用于研究纤维在磁场中的行为。纤维尺寸与纤维材料的磁饱和度一起起着最重要的作用。多根纤维表现出显著的相互作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dee3/8745836/640d881940a4/materials-15-00128-g014.jpg
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本文引用的文献

1
A Statistical Model of Fibre Distribution in a Steel Fibre Reinforced Concrete.钢纤维增强混凝土中纤维分布的统计模型
Materials (Basel). 2021 Nov 29;14(23):7297. doi: 10.3390/ma14237297.
2
The Development of Controlled Orientation of Fibres in SFRC.钢纤维混凝土中纤维的可控取向发展
Materials (Basel). 2021 Aug 7;14(16):4432. doi: 10.3390/ma14164432.
3
Electromagnetic Properties of Steel Fibres for Use in Cementitious Composites, Fibre Detection and Non-Destructive Testing.用于水泥基复合材料的钢纤维的电磁特性、纤维检测与无损检测
Materials (Basel). 2021 Apr 22;14(9):2131. doi: 10.3390/ma14092131.
4
Orientation of Steel Fibers in Magnetically Driven Concrete and Mortar.钢纤维在磁驱动混凝土和砂浆中的取向
Materials (Basel). 2018 Jan 22;11(1):170. doi: 10.3390/ma11010170.