高速飛翔体衝突により発生する衝撃波の金属中の伝搬の定量解析

抄録

It is difficult to experimentally determine the waveform of the shock wave in nanometer scale that propagates and reflects in the solid. In present study, molecular dynamics (MD) simulation is perform to clarify this waveform in fcc crystalline Al and Ni. Simulated metal/metal collision system is similar to the equipment of the split Hopkinson pressure bar method, which is the high-speed deformation test method. Discrete physical quantity of atoms are converted to the one dimensional continuum quantity. The waveform of the incident and reflected shock waves are fitted to the complex function consisting of sine wave, exponential damping, Gaussian and sigmoid functions. The parameters of the complex function are obtained as a function of time. The fitted function well represents the nanometer level waveform of the shock wave.