Characterization of the Dynamic Response and Constitutive Behavior of PTFE/Al/W Reactive Materials

In this study, the static and dynamic mechanical behaviors of four types of PTFE/Al/W reactive materials with different component mass ratios were studied. The mechanical properties of reactive materials at elevated strain rates and temperatures were tested by quasi-static compression and Split Hopkinson Pressure Bar (SHPB). Parametric study on material properties was carried out, and the Johnson-Cook constitutive constants were well determined. Based on the good agreement between the predicted and tested constitutive response, a systematic comparison of the static and dynamic behaviors, as well as the comprehensive stress-strain relationships were conducted, regarding the strain rate and temperature effect. Microscopic fractographic analysis of the tested samples reveals the localized thermal softening effects and fiber network formation phenomenon of the matrix, which dominate the overall mechanical response of the four types of PTFE/Al/W reactive materials, and contribute to the elasto-plastic property, strain hardening, strain rate strengthening and thermal softening effects.