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Cyclic Indentation of Iron: A Comparison of Experimental and Atomistic Simulations

1
Institute of Materials Science and Engineering, University Kaiserslautern, Gottlieb-Daimler-Str. 44, 67663 Kaiserslautern, Germany
2
Physics Department and Research Center OPTIMAS, University Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 541; https://doi.org/10.3390/met9050541
Received: 15 April 2019 / Revised: 6 May 2019 / Accepted: 7 May 2019 / Published: 10 May 2019
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Abstract

Cyclic indentation is a technique used to characterize materials by indenting repeatedly on the same location. This technique allows information to be obtained on how the plastic material response changes under repeated loading. We explore the processes underlying this technique using a combined experimental and simulative approach. We focus on the loading–unloading hysteresis and the dependence of the hysteresis width ha,p on the cycle number. In both approaches, we obtain a power-law demonstrating ha,p with respect to the hardening exponent e. A detailed analysis of the atomistic simulation results shows that changes in the dislocation network under repeated indentation are responsible for this behavior. View Full-Text
Keywords: molecular dynamics; cyclic indentation; hardness; dislocation density; hysteresis molecular dynamics; cyclic indentation; hardness; dislocation density; hysteresis
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Deldar, S.; Alabd Alhafez, I.; Smaga, M.; Beck, T.; Urbassek, H.M. Cyclic Indentation of Iron: A Comparison of Experimental and Atomistic Simulations. Metals 2019, 9, 541.

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