Effect of mean stress on cyclic stress-strain response of copper single crystals

被引：0
|
作者：
Lukás, P [1 ]
Kunz, L [1 ]
Svoboda, M [1 ]
机构：
[1] Acad Sci Czech Republ, Inst Phys Mat, Brno, Czech Republic
来源：
FATIGUE '99: PROCEEDINGS OF THE SEVENTH INTERNATIONAL FATIGUE CONGRESS, VOLS 1-4 | 1999年
关键词：
D O I：
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中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Copper single crystals oriented for single slip were cyclically loaded under load control with a non-zero mean stress. Contrary to symmetrical strain controlled tests there is no plateau at the cyclic stress-strain plot and there are no persistent slip bands in the dislocation structure. The microcracks initiate - as in case of symmetrical cycling - at the surface coarse slip markings having a sharp notch-peak topography. This leads to the conclusion that the persistent slip bands do not always play the crucial role in the initiation of fatigue microcracks.
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页码：115 / 122
页数：8
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