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首页> 外文期刊>International journal of nanomechanics science and technology >MODELING THE HEALING OF MICROCRACKS IN METAL STIMULATED BY A PULSED HIGH-ENERGY ELECTROMAGNETIC FIELD. PART I
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MODELING THE HEALING OF MICROCRACKS IN METAL STIMULATED BY A PULSED HIGH-ENERGY ELECTROMAGNETIC FIELD. PART I

机译：对脉冲高能电磁场激发的金属中微裂纹的愈合进行建模。第一部分

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摘要

The processes occurring in metallic specimens under the impact of electric high-density current are considered. The electric and temperature fields and their influence on the phase transformation and stress-strain state in the vicinity of microdefects in the form of plane cracks are studied. A mathematical model of the effect of an electromagnetic field on the predamaged elastic-plastic material with an ordered system of defects is proposed. The model accounts for melting and evaporation of material and the dependence of its all physical and mechanical properties on temperature. The problem is solved by finite elements method with the use of an adaptive mesh on the basis of an arbitrar Euler-Lagrange method. The numerical modeling has shown that in the vicinity of microdefects a high-density current with large field gradients arises, which leads to intense local heating accompanied by thermal expansion and melting of the metal on the tips of the microcracks. This results in high compressive stresses in the vicinity of microcracks, intense plastic flaw of the material and, as a consequence, in the clamping of microcrack sides, decrease in microcrack length, and in the ejection of the molten material into the crack. As a result, the microcrack is completely healed. The numerical results obtained by the proposed model agree with experiment.
机译：考虑了在高密度电流的作用下金属试样中发生的过程。研究了平面裂纹形式的微缺陷附近的电场和温度场及其对相变和应力应变状态的影响。提出了电磁场对有序缺陷系统的预损伤弹塑性材料影响的数学模型。该模型说明了材料的熔化和蒸发以及其所有物理和机械特性对温度的依赖性。该问题通过基于自适应Euler-Lagrange方法的自适应网格的有限元方法解决。数值模型表明，在微缺陷附近，会出现具有大场梯度的高密度电流，这会导致剧烈的局部加热，并伴随着金属在微裂纹尖端的热膨胀和熔化。这导致微裂纹附近的高压缩应力，材料的强烈塑性裂纹，并因此导致微裂纹侧面的夹紧，微裂纹长度的减小以及熔融材料向裂纹的喷射。结果，微裂纹被完全治愈。该模型得到的数值结果与实验吻合。

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