Strengthening and Stiffening of Plastic Bonded Explosives Under Pressure and Metal-Like Mechanical Properties

摘要

The mechanical properties of composite plastic bonded explosives are being studied as a function of hydrostatic pressure. The flow stress and the modulus obtained in simple compression are both found to increase with increasing confining pressure. Thus, these materials become stronger and stiffer with increasing pressure. The failure process also changes with pressure. At atmospheric pressure, failure is primarily due to crack processes, while at elevated pressures failure is due primarily to plastic flow. Several mechanisms, which account for the pressure dependencies of the flow stress, the modulus, and the failure processes are discussed.