修复导电材料裂纹所需的短电流脉冲能量

IF 0.6 4区 工程技术 Q4 MECHANICS
K. V. Kukudzhanov, A. V. Chentsov
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引用次数: 0

摘要

近年来,研究人员对利用强脉冲电磁场修复金属材料的宏观裂纹和微缺陷的研究日益增加。这里的愈合是指通过连接(焊接)裂缝边缘(宏观和微观尺寸)来恢复材料的连续性。脉冲电磁场下裂纹的完全愈合是一项非常复杂的任务,而选择电脉冲作用模式来导致样品中特定裂纹的完全愈合纯粹是基于经验的。与此同时,不同的研究人员在修复同一金属中类似的大裂纹时,经常使用脉冲参数,如最大感应电流密度和脉冲持续时间,这些参数相差好几个数量级。正是由于脉冲电磁场效应的作用范围太广,使得对板条宏观裂纹愈合现象的实验观察结果差异很大,并对其愈合机理进行了探讨。此外,电脉冲作用的最佳模式的选择,如果纯粹的经验-通过逐次逼近的方法,是非常繁琐和无效的。在本工作中,基于一个简单的解析模型,试图限制上述非常广泛的电流脉冲模式在板和带的大裂纹上,以及在材料的内部微缺陷上,这仍然会导致它们的愈合。在提出的模式范围内,我们建议不像以前那样选择脉冲的几个参数,而是只选择一个-在一个脉冲中耗散在材料中的特定电磁能量(脉冲的能量)。该能量的值取决于材料的物理性质和裂纹尖端处的电磁能量强度因子。结果表明,能量强度因子集中系数仅取决于裂纹和试样的几何形状(或其中微裂纹的相互排列)。该依赖关系可用于调整裂纹愈合过程中的脉冲参数(减小裂纹长度或增大尖端曲率半径或到自由边界的距离)。因此,利用这种依赖关系,可以设置电脉冲作用的最佳模式。对金属和合金裂纹的分析估计与实验数据的比较证实了模型中所作假设的有效性,以及该方法进一步发展和实际应用的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Energy of Short Current Pulses Required for Healing Cracks in Conductive Materials

The Energy of Short Current Pulses Required for Healing Cracks in Conductive Materials

Recently, there has been a significant increase in the interest of researchers to application of strong pulsed electromagnetic field for healing both macrocracks and microdefects in metallic materials. The healing here is meant as the restoration of the continuity of the material by joining (welding) the edges of cracks (both macro- and micro-sizes). Complete healing of cracks by exposure to the pulsed electromagnetic field is a very complex task, and the choice of the electric pulse action mode that leads to full healing of specific cracks in the samples is of a purely experience based. At the same time, different researchers for healing similar macrocracks in the same metal often use the pulse parameters, such as the maximum induced current density and pulse duration – differing by several orders of magnitude. It is because of such excessively wide range of the pulsed electromagnetic field effects, the results of experimental observations of macrocracks healing phenomenon in plates and strips do vary a lot, and also the discussions occur regarding the mechanism of such healing. In addition, the selection of the optimal mode of electric pulse action if made purely empirically – by the method of successive approximations, is very tedious and ineffective. In the present work, based on a simple analytical model, an attempt is made to limit the above-mentioned very wide range of modes of current pulses on macrocracks in plates and strips, as well as on internal microdefects in the material, which still would lead to their healing. In the proposed range of modes, we propose to select rather not the several parameters of the pulse, as was done previously, but selecting just one – the specific electromagnetic energy dissipated in the material at one pulse (energy of the pulse). The value of this energy depends on the physical properties of the material and on the electromagnetic energy intensity factor at the crack tip. The energy intensity factor concentration coefficient turns out to depend only on the geometry of the crack and the sample (or the mutual arrangement of microcracks in it). The obtained dependence is proposed to be used to adjust the pulse parameters in the process of crack healing (reducing its length or increasing the radius of curvature at the tip or the distance to the free boundary). Thus, using this dependence, it is possible to set the optimal mode of electric pulse action. Comparison of analytical estimates with experimental data for cracks in metals and alloys confirms the validity of the assumptions made in the model, as well as the possibility of further development and practical application of the proposed approach.

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来源期刊
Mechanics of Solids
Mechanics of Solids 医学-力学
CiteScore
1.20
自引率
42.90%
发文量
112
审稿时长
6-12 weeks
期刊介绍: Mechanics of Solids publishes articles in the general areas of dynamics of particles and rigid bodies and the mechanics of deformable solids. The journal has a goal of being a comprehensive record of up-to-the-minute research results. The journal coverage is vibration of discrete and continuous systems; stability and optimization of mechanical systems; automatic control theory; dynamics of multiple body systems; elasticity, viscoelasticity and plasticity; mechanics of composite materials; theory of structures and structural stability; wave propagation and impact of solids; fracture mechanics; micromechanics of solids; mechanics of granular and geological materials; structure-fluid interaction; mechanical behavior of materials; gyroscopes and navigation systems; and nanomechanics. Most of the articles in the journal are theoretical and analytical. They present a blend of basic mechanics theory with analysis of contemporary technological problems.
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