Mechanical Response Comparison of Gun Propellants Evaluated Under Equivalent Time-Temperature Conditions
Abstract
Compressive stress relaxation measurements have been performed for single- (M14), double- (JA2), and triple-base (M30) propellants, as well as a nitramine composite (M43) gun propellant. This was done to evaluate the response of gun propellants at higher rates than can be easily reached within the laboratory by calculating time-temperature shift factors from these relaxation curves. However, in order to apply these shift parameters to high rate events to predict propellant mechanical response and damage, a link must be established between predicted equivalent response and the actual mechanical and failure behavior observed for these propellants. The mechanical response of these four propellants was characterized at strain rates, which spanned four orders of magnitude, and at the corresponding shifted temperatures. Test results show that the mechanical response for a given propellant type under each of these temperature-rate conditions was the same in the strain domain for which the relaxation shift factors were measured. In addition, the failure response for a given propellant type also proved to be nearly identical at strain levels outside the domain of the stress relaxation tests. These observations permit greater confidence to be placed in the prediction of mechanical and failure response for gun propellants undergoing deformation in strain rate regime the current range of laboratory measurement. Mechanical response, Time-temperature, Propellants, Bed, JA2, M 14, M30, M43, stress Profile, Strain rate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1993
- Accession Number
- ADA270479
Entities
People
- Michael G. Leadore
- Robert J. Lieb
Organizations
- United States Army Research Laboratory