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| The optimization of a tensile split Hopkinson bar and the determination of the dynamic constitutive models for Oxygen-free high conductivity copper |
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Abstract A optimizing analysis of a tensile split Hopkinson bar (TSHB) is presented to make effective measure for the stress, strain and strain rate in the specimen. The numerical simulation of the TSHB test is performed including the effects of interconnecting linkage on the experimental data. Gauge length and geometry of the TSHB specimen are required to reduce ring-up time, inertial effects, and to result in uniaxial stress and uniform stress and strain state in the specimen. The stress-strain curves of quasi-stratic tension tests and the optimized TSHB tests of different strain rates and temperatures are obtained and fitted to determine the J-C and Z-A type dynamic constitutive models for a oxygen-free high conductivity (OFHC) copper. The reflected and transmitted pulses computed with the determined constitutive models for OFHC copper can be consistent with the experimental data to a certain extent. It is indicated that TSHB tests should be optimized and the determined constitutive models of the specimen should be checked by using the numerical simulations of TSHB tests.
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Received: 04 August 2009
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2011, Vol. 32 
