Measurements of free surface velocity profiles of high-purity Zr samples under shock-wave loading are performed to study the dynamic strength and phase transition parameters. The peak pressure of the compression waves...Measurements of free surface velocity profiles of high-purity Zr samples under shock-wave loading are performed to study the dynamic strength and phase transition parameters. The peak pressure of the compression waves is within the range from 9 to 14 GPa, and the Hugoniot elastic limit is 0.5 GPa. An anomalous structure of shock waves is observed due to the α - ω phase transition in Zr. Shock pressure has effects on transition pressure which increases with increasing compression strength, and the stronger shocks have a lower transit time.展开更多
Temperatures of multi-shock compressed gaseous hydrogen-helium mixtures with a mole component H2 ：He=1：1.21 up to 7100 K are measured at pressures up to 10 GPa by means of an instantaneous optical pyrometer. The gas...Temperatures of multi-shock compressed gaseous hydrogen-helium mixtures with a mole component H2 ：He=1：1.21 up to 7100 K are measured at pressures up to 10 GPa by means of an instantaneous optical pyrometer. The gas mixtures are shocked from environmental temperature at the initial pressure 20 MPa. The measured second-shock temperature differs from the predictions of the non-dissociation model by up to 40% and is in good agreement with that of the dissociation model, indicating that a considerable amount of molecular dissociation occurs.展开更多
文摘Measurements of free surface velocity profiles of high-purity Zr samples under shock-wave loading are performed to study the dynamic strength and phase transition parameters. The peak pressure of the compression waves is within the range from 9 to 14 GPa, and the Hugoniot elastic limit is 0.5 GPa. An anomalous structure of shock waves is observed due to the α - ω phase transition in Zr. Shock pressure has effects on transition pressure which increases with increasing compression strength, and the stronger shocks have a lower transit time.
基金Supported by the National Natural Science Foundation of China under Grant No 10674120, and the Science and Technology Development Foundation of China Academy of Engineering Physics under Grant No 2007A01002.
文摘Temperatures of multi-shock compressed gaseous hydrogen-helium mixtures with a mole component H2 ：He=1：1.21 up to 7100 K are measured at pressures up to 10 GPa by means of an instantaneous optical pyrometer. The gas mixtures are shocked from environmental temperature at the initial pressure 20 MPa. The measured second-shock temperature differs from the predictions of the non-dissociation model by up to 40% and is in good agreement with that of the dissociation model, indicating that a considerable amount of molecular dissociation occurs.
