Abstract ▼ AI-Helper

The responses of nanocrystalline aluminum powder of different grain sizes, was modeled Using, Khan, Huang, and Liang (KHL) viscoplastic model including hi-linear Hall-Petch type, based on experimental measurements. Correlation of strain-rate-dependent stress responses for different grain sizes were ...

The responses of nanocrystalline aluminum powder of different grain sizes, was modeled Using, Khan, Huang, and Liang (KHL) viscoplastic model including hi-linear Hall-Petch type, based on experimental measurements. Correlation of strain-rate-dependent stress responses for different grain sizes were in good agreement with the experimental results.

The responses of nanocrystalline aluminum powder of different grain sizes, was modeled Using, Khan, Huang, and Liang (KHL) viscoplastic model including hi-linear Hall-Petch type, based on experimental measurements. Correlation of strain-rate-dependent stress responses for different grain sizes were in good agreement with the experimental results.

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• 연구 방법

제안 방법

• In order to a set of material constants, non-linear least squares calculation was performed to optimally correlate the multiple data sets for a grain size of 60 nm at strain rates of 1 s-1 and 0.0001 s, and 40, 50, 60, 80 nm at a strain rate of 0.0001 s-1 for nanocrystalline aluminum [3]. The refined material is shown at the presentation.
• In order to model the viscoplastic stress response using a bilinear Hall-Petch relation, the KHL model was modified [1-2]. The original model used for materials with grain size in a macro range, is expressed as follows,
• This bi-linear expression was implemented into the KHL model in order to correlate the viscoplastic stress response of nanocrystalline aluminum. The stress responses from the quasi-static loading under different grain size and strain rates were compared with other experimental observations using material constants that were optimized by the nonlinear least-squares fit. The correlations and prediction were found to be in good agreement with experimental results.

대상 데이터

• The authors are grateful for the funding of this project by the Army Research Office under cooperative agreement DAAH04-95-2-0004. The work by the second author was performed when he was on sabbatical leave at the University of Maryland, Baltimore County.

이론/모형

• This expression gave a good correlation with experimental observation [3], as compared to the conventional Hall-Petch relation in the entire range of grain sizes. This bi-linear expression was implemented into the KHL model in order to correlate the viscoplastic stress response of nanocrystalline aluminum. The stress responses from the quasi-static loading under different grain size and strain rates were compared with other experimental observations using material constants that were optimized by the nonlinear least-squares fit.

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