Overhead conductor heating chamber and temperature effects on the fatigue life of aluminum alloy 6201-T81 conductors

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-08-21 DOI:10.1111/ffe.14421

Ricardo Lenon Da Silva Rodrigues, Miguel Angel Garcia, José Alexander Araújo, Jorge Luiz De Almeida Ferreira, Cosme Roberto Moreira da Silva, Remy Kalombo Badibanga

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引用次数: 0

Abstract

This work investigates the impact of temperature on the fatigue life All Aluminum Alloy Conductors (AAAC) made of 6201-T81. A heating chamber was developed to simulate thermal effects induced by electric current passage. Wöhler fatigue curves were generated under isothermal conditions at 75 and 150°C and later compared with the one at 20°C. The conductor exhibited similar fatigue life at 20 and 75°C; however, a significant increase of life was observed for tests at 150°C. Hardness tests and failure analysis of wire breakages were carried out on samples extracted from the conductor coil and on artificially aged samples maintained at controlled temperatures. The analyses revealed that at a temperature of 150°C, there is formation of small precipitates of magnesium and silicon within the aluminum matrix, which impeded the propagation of discontinuities, increasing the material's hardness and fatigue resistance.

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架空导体加热室和温度对铝合金 6201-T81 导体疲劳寿命的影响

这项研究探讨了温度对 6201-T81 铝合金导体（AAAC）疲劳寿命的影响。开发了一个加热室来模拟电流通过时引起的热效应。在 75 和 150°C 等温条件下生成了沃勒疲劳曲线，随后与 20°C 时的疲劳曲线进行了比较。导体在 20 和 75°C 温度下的疲劳寿命相似，但在 150°C 温度下的测试中，寿命明显延长。对从导体线圈中提取的样品和在受控温度下人工老化的样品进行了硬度测试和断线失效分析。分析结果表明，在 150°C 的温度下，铝基体中会形成镁和硅的小沉淀物，这阻碍了不连续性的扩展，从而提高了材料的硬度和抗疲劳性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.