Constant Critical Strain for Mechanical Failure of Several Particulate PolymerComposite Explosives and Propellants and Other Explosives

摘要

The mechanical response in compression of several polymer composite explosivesand propellants and two other explosives was determined as a function of temperature and strain rate. The compressive strength (maximum stress) and the apparent modulus increase with decreasing temperature and increasing strain rate, are proportional to each other. While the compressive strength and the modulus vary by about an order of magnitude, the strain at the maximum stress is approximately constant with variations of strain rate and temperature. This approximately constant strain can be used as a criterion for failure, and suggests a critical local strain or displacement for failure.