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Numerical simulation of the temperature rise in intermediate and high strain rate experiments
Majed Baselem,Ramzi Othman,Abdessalem Chamekh 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
Intermediate and high strain rate experiments are of a limited duration. Thus, the specimen temperature cannot be assumed constant. Inthis work, we investigated the adiabatic assumption in intermediate and high strain experiments. A two-step one-dimensional model wasdeveloped to simulate the temperature rise in Hopkinson bar experiments for strain rates ranging between 1 and 5000/s. The model isapplied to predict temperature rise in an aluminum alloy. The adiabatic assumption is shown to be valid for strain rates higher than 500/s. However, the isothermal assumption is not valid even at 1/s of strain rate. These conclusions are very important for the interpretation ofthe stress-strain curves that are measured at medium and high strain rates.