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Original Articles

Effect of material stiffness on hardness: A computational study based on model potentials

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Pages 2225-2238 | Received 07 Aug 2008, Accepted 05 May 2009, Published online: 26 Aug 2009
 

Abstract

We investigate the dependence of the hardness of materials on their elastic stiffness. This is possible by constructing a series of model potentials of Morse type; starting with modelling natural Cu, the model potentials exhibit an increased elastic modulus, while keeping all other potential parameters (lattice constant, bond energy) unchanged. Using molecular-dynamics simulation, we perform nanoindentation experiments on these model crystals. We find that the crystal hardness scales with the elastic stiffness. Also the load drop, which is experienced when plasticity sets in, increases in proportion to the elastic stiffness, while the yield point, i.e. the indentation at which plasticity sets in, is independent of the elastic stiffness.

Acknowledgements

The authors acknowledge financial support by the Deutsche Forschungsgemeinschaft via the Graduiertenkolleg 814.

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