Abstract
In the present work a new equation to determine the internal material length scale for strain gradient plasticity theories from two independent experiments (uniaxial and nanoindentation tests) is introduced. The applicability of the presented equation is verified for conventional grained as well as for ultrafine-grained copper and brass with different amounts of prestraining. A significant decrease of the experimentally determined internal material length scale is found for increasing dislocation densities due to prestraining. Conventional mechanism strain gradient plasticity theory is used for simulating the indentation response, using experimentally determined material input data as the yield stress, the work-hardening behavior and the internal material length scale. The work-hardening behavior and the yield stress were taken from the uniaxial experiments, whereas the internal material length scale was calculated using the yield stress from the uniaxial experiment, the macroscopic hardness H 0 and the length scale parameter h* following from the nanoindentation experiment. A good agreement between the measured and calculated load-displacement curve and the hardness is found independent of the material and the microstructure.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1197-1207 |
| Number of pages | 11 |
| Journal | Journal of Materials Research |
| Volume | 24 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 1 2009 |
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ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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The correlation between the internal material length scale and the microstructure in nanoindentation experiments and simulations using the conventional mechanism-based strain gradient plasticity theory. / Backes, Bjoem; Huang, Y. Y.; Göken, M.; Durst, K.
In: Journal of Materials Research, Vol. 24, No. 3, 01.03.2009, p. 1197-1207.Research output: Contribution to journal › Article
TY - JOUR
T1 - The correlation between the internal material length scale and the microstructure in nanoindentation experiments and simulations using the conventional mechanism-based strain gradient plasticity theory
AU - Backes, Bjoem
AU - Huang, Y. Y.
AU - Göken, M.
AU - Durst, K.
PY - 2009/3/1
Y1 - 2009/3/1
N2 - In the present work a new equation to determine the internal material length scale for strain gradient plasticity theories from two independent experiments (uniaxial and nanoindentation tests) is introduced. The applicability of the presented equation is verified for conventional grained as well as for ultrafine-grained copper and brass with different amounts of prestraining. A significant decrease of the experimentally determined internal material length scale is found for increasing dislocation densities due to prestraining. Conventional mechanism strain gradient plasticity theory is used for simulating the indentation response, using experimentally determined material input data as the yield stress, the work-hardening behavior and the internal material length scale. The work-hardening behavior and the yield stress were taken from the uniaxial experiments, whereas the internal material length scale was calculated using the yield stress from the uniaxial experiment, the macroscopic hardness H 0 and the length scale parameter h* following from the nanoindentation experiment. A good agreement between the measured and calculated load-displacement curve and the hardness is found independent of the material and the microstructure.
AB - In the present work a new equation to determine the internal material length scale for strain gradient plasticity theories from two independent experiments (uniaxial and nanoindentation tests) is introduced. The applicability of the presented equation is verified for conventional grained as well as for ultrafine-grained copper and brass with different amounts of prestraining. A significant decrease of the experimentally determined internal material length scale is found for increasing dislocation densities due to prestraining. Conventional mechanism strain gradient plasticity theory is used for simulating the indentation response, using experimentally determined material input data as the yield stress, the work-hardening behavior and the internal material length scale. The work-hardening behavior and the yield stress were taken from the uniaxial experiments, whereas the internal material length scale was calculated using the yield stress from the uniaxial experiment, the macroscopic hardness H 0 and the length scale parameter h* following from the nanoindentation experiment. A good agreement between the measured and calculated load-displacement curve and the hardness is found independent of the material and the microstructure.
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U2 - 10.1557/jmr.2009.0123
DO - 10.1557/jmr.2009.0123
M3 - Article
VL - 24
SP - 1197
EP - 1207
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 3
ER -