Development of Ti/Pt Periodically Modulated Graded Materials: Toward Structural Optimization and Controllable Pressure-Strain Rate Functionality
摘要
We used hydrodynamic simulations and shock wave propagation theories to analyze the behavior of shock waves within Ti/Pt periodically modulated graded structures and their integration layers. The effects of the total number of periodic layers, the total thickness of graded materials and loading velocity on the integration layer thickness and behavior of pressure-strain rate were systematically investigated. The results reveal that, by adjusting the total number of periodically modulated layers, the total thickness of graded materials and loading velocity the pressure amplitudes of the reflected compressive and rarefaction waves at different interfaces of Ti/Pt periodically modulated graded materials can be precisely controlled. Furthermore, empirical structural design criteria for Ti/Pt periodically modulated graded materials are established. The thickness ratio variation between adjacent Ti/Pt layers in the periodic structure must exceed 0.32. After the collaborative design of the integration layer, Ti/Pt periodically modulated graded materials can achieve a controllable loading function with pressures ranging from 1.4 to 144 GPa and strain rates from 3.8×104 to 1.7×107 s−1. The outcomes of this research provide a theoretical and simulation basis for the optimized design of periodically modulated graded materials to be utilized in ramp compression experiments.