Abstract
In this work, a one-dimensional simplified model was developed to predict stress, strain, and strain-rate in high strain rates Hopkinson pressure bar experiments, namely, between 500-5000/s. To this goal, a one-dimensional model for Hokinson bar tests was developed based on analyses of wave propagation in bars and assuming the specimen is under equilibrium during the test. The numerical tool implemented using Matlab and validated regarding experimental data. This new model will be very helpful in designing the specimens for split Hopkinson bar tests and also in the interpretation of the experimental raw data.
Highlights
Since the pioneering works of Hopkinson and Kolsky, several improvements have been undertaken on the Hopkinson-Kolsky device
The useful test time, which is of some hundreds of microseconds in high strain rate tests, is short compared to the heat transfer or dissipation time
Almost no heat is lost during the useful duration of a high strain rate test
Summary
Since the pioneering works of Hopkinson and Kolsky, several improvements have been undertaken on the Hopkinson-Kolsky device. The conventional Hopkinson-bar is mainly used at the high strain rate range, i.e., between 500 and 5000/s. The split Hopkinson bar test (SHPT) can be used to describe either ductile or brittle materials. This almost happens with ductile metals and polymers where significant plastic deflection occurs. The plastic deformation energy is partially or totally transformed to heat, which is either dissipated to the atmosphere or to the bars. The useful test time, which is of some hundreds of microseconds in high strain rate tests, is short compared to the heat transfer or dissipation time. Almost no heat is lost during the useful duration of a high strain rate test. The accumulation of heat induces a temperature rise in the specimen
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