霍普金森压杆整形器模型

Adding a pulse shaper for Hopkinson bars is an important method to adjust the profile of incident pulses and accurately measure the dynamic mechanical properties of explosives. To predict the complete profile of incident pulses after incorporating the pulse shaper, the wave propagation process in the striker-pulse shaper-incident bar system is analyzed based on the stress wave theory. A unified governing equation predicting the loading-unloading process of pulse shapers is obtained using the superposition principle of waves. Consequently, a general pulse shaper model is developed. The one-dimensional stress-strain relationship of T2 pure copper is obtained by using Hopkinson pressure bar and pulse shaper experiments. The model predicts the profile of incident pulses of single pulse shaper and dual pulse shaper experiments, and analyzes the deformation characteristics of the pulse shaper under various conditions. The results show that the pulse shaper model is able to predict the complete profile of incident pulses, including the unloading range. The profile of incident pulses predicted by the model is in good agreement with the experimental results, indicating the validity of the model and the high accuracy of the calibrated parameters.