Grain size effect on strain-rate dependence of mechanical properties of polycrystalline copper

ABSTRACT

This work illustrates the grain size effect on strain-rate dependence of mechanical properties of polycrystalline copper through experimental characterisations and numerical calculations. The as-received and annealed samples with different grain sizes are prepared. Mechanical properties at high strain rates are experimentally attained by using a split Hopkinson pressure bar device. With the increase of grain size, dynamic flow stress decreases, but strain-rate dependence of flow stress increases. Johnson–Cook constitutive model is applied to carry out a numerical analysis about the grain size effect on strain-rate dependence of mechanical data and the quantificational illustrations are given.

KEYWORDS:

• Polycrystalline copper
• grain size
• mechanical properties
• strain-rate dependence
• experimental characterisations
• numerical calculations
• flow stress
• Johnson–Cook constitutive model

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Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors acknowledge the financial supports from the National Natural Science Foundation of China: [grant number 11602024].