Details
| Original language | English |
|---|---|
| Pages (from-to) | 243-250 |
| Number of pages | 8 |
| Journal | International journal of fatigue |
| Volume | 28 |
| Issue number | 3 |
| Publication status | Published - Mar 2006 |
| Externally published | Yes |
Abstract
The present study reports on the cyclic stress-strain response of ultrafine grained copper obtained by equal channel angular extrusion (ECAE). Fatigue behavior of material subjected to between 8 and 16 ECAE passes was studied both in constant amplitude and incremental step tests. Transmission electron microscopy was employed to shed light on the microstructural evolution. Samples that had been extruded by an optimized ECAE route (16E) displayed stable cyclic stress-strain response. Independent of the actual cyclic loading condition, all the ECAE processed material demonstrated near perfect Masing behavior indicating that the ECAE routes selected resulted in microstructures stable against fatigue-induced changes. This is in contrast to copper with conventional grain sizes. An additional heat treatment that resulted in a bimodal microstructure eliminated the differences in cyclic response that had resulted from the various ECAE routes applied. Still, the bimodal structure proved to be cyclically stable in strain-controlled tests conducted at room temperature. Preliminary studies from an in-situ tests conducted in a scanning electron microscope demonstrated that non-optimized ECAE routes will lead to rapid cyclic instability, severe damage localization and premature fatigue failure.
Keywords
- Cyclic stress-strain response, Equal channel angular extrusion, Incremental step test, Masing behavior, Ultrafine microstructures
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International journal of fatigue, Vol. 28, No. 3, 03.2006, p. 243-250.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Cyclic stress-strain response of ultrafine grained copper
AU - Maier, H. J.
AU - Gabor, P.
AU - Gupta, N.
AU - Karaman, I.
AU - Haouaoui, M.
N1 - Funding Information: This study was supported by Deutsche Forschungsgemeinschaft, contract no. MA1175/17-1, within the Research Unit Program ‘Mechanische Eigenschaften und Grenzflächen ultrafeinkörniger Werkstoffe’. The U.S. part of the research was supported by the National Science Foundation contract CMS 01-34554, Solid Mechanics and Materials Engineering Program, Directorate of Engineering, Arlington, Virginia.
PY - 2006/3
Y1 - 2006/3
N2 - The present study reports on the cyclic stress-strain response of ultrafine grained copper obtained by equal channel angular extrusion (ECAE). Fatigue behavior of material subjected to between 8 and 16 ECAE passes was studied both in constant amplitude and incremental step tests. Transmission electron microscopy was employed to shed light on the microstructural evolution. Samples that had been extruded by an optimized ECAE route (16E) displayed stable cyclic stress-strain response. Independent of the actual cyclic loading condition, all the ECAE processed material demonstrated near perfect Masing behavior indicating that the ECAE routes selected resulted in microstructures stable against fatigue-induced changes. This is in contrast to copper with conventional grain sizes. An additional heat treatment that resulted in a bimodal microstructure eliminated the differences in cyclic response that had resulted from the various ECAE routes applied. Still, the bimodal structure proved to be cyclically stable in strain-controlled tests conducted at room temperature. Preliminary studies from an in-situ tests conducted in a scanning electron microscope demonstrated that non-optimized ECAE routes will lead to rapid cyclic instability, severe damage localization and premature fatigue failure.
AB - The present study reports on the cyclic stress-strain response of ultrafine grained copper obtained by equal channel angular extrusion (ECAE). Fatigue behavior of material subjected to between 8 and 16 ECAE passes was studied both in constant amplitude and incremental step tests. Transmission electron microscopy was employed to shed light on the microstructural evolution. Samples that had been extruded by an optimized ECAE route (16E) displayed stable cyclic stress-strain response. Independent of the actual cyclic loading condition, all the ECAE processed material demonstrated near perfect Masing behavior indicating that the ECAE routes selected resulted in microstructures stable against fatigue-induced changes. This is in contrast to copper with conventional grain sizes. An additional heat treatment that resulted in a bimodal microstructure eliminated the differences in cyclic response that had resulted from the various ECAE routes applied. Still, the bimodal structure proved to be cyclically stable in strain-controlled tests conducted at room temperature. Preliminary studies from an in-situ tests conducted in a scanning electron microscope demonstrated that non-optimized ECAE routes will lead to rapid cyclic instability, severe damage localization and premature fatigue failure.
KW - Cyclic stress-strain response
KW - Equal channel angular extrusion
KW - Incremental step test
KW - Masing behavior
KW - Ultrafine microstructures
UR - http://www.scopus.com/inward/record.url?scp=29144448326&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2005.05.004
DO - 10.1016/j.ijfatigue.2005.05.004
M3 - Article
AN - SCOPUS:29144448326
VL - 28
SP - 243
EP - 250
JO - International journal of fatigue
JF - International journal of fatigue
SN - 0142-1123
IS - 3
ER -