Ultra-low cycle torsion fatigue of annealed copper

Autor:	I. Altenberger, A. Cote, M. Burwell, Uwe Hofmann, J. Riedle
Rok vydání:	2015
Předmět:	Materials science Mechanical Engineering Metallurgy Torsion (mechanics) chemistry.chemical_element Plasticity Microstructure Power law Fatigue limit Copper Damper chemistry Mechanics of Materials General Materials Science Softening
Zdroj:	Fatigue & Fracture of Engineering Materials & Structures. 38:1432-1442
ISSN:	8756-758X
DOI:	10.1111/ffe.12311
Popis:	Torsion experiments show that pure annealed copper is able to withstand very high plastic strain amplitudes when it is loaded cyclically with less than 30 cycles to failure. Under these ultra-low cycle fatigue conditions, the performance of copper is significantly better than that of the annealed steels A36 and AISI 304, which were also tested in this study for comparison. The dependence of fatigue life on strain range can be described by a power law. In the case of an initial overloading, fatigue life can be estimated using the Palmgren–Miner rule. The long low cycle fatigue life of copper is explained by a thermally activated softening mechanism which takes place while the material heats up as a result of the cyclically repeated plastic deformation. The softening is accompanied by a change in microstructure. The low cycle fatigue properties of copper can be utilized for designing hysteretic dampers for seismic protection.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::74d1017a8424bf2ce098a29d9f98a321 https://doi.org/10.1111/ffe.12311 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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