Accession Number : ADB077088

Title :   The Effect of Temperature and Strain Rate on the Impact Fracture Toughness of Plastic Q and the Relationship with Dynamic Mechanical Loss Transitions.

Descriptive Note : Technical memo.,

Corporate Author : WEAPONS SYSTEMS RESEARCH LAB ADELAIDE (AUSTRALIA)

Personal Author(s) : Fong,C. W.

Report Date : FEB 1981

Pagination or Media Count : 33

Abstract : The impact fracture toughness of Plastic Q has been determined by fracture mechanics over the temperature range from 20deg C to -70deg C. A major peak in fracture toughness at -10deg C has been found to correspond to a secondary loss transition in plasticized cellulose acetate. At -10deg C, the fracture toughness is directly proportional to the log of the maximum strain rate. There appears to be some evidence for a plane strain to plane stress transition with varying specimen thickness and temperature.

Descriptors :   *GUN PROPELLANTS, *LOADS(FORCES), *FRACTURE(MECHANICS), *MECHANICAL PROPERTIES, CELLULOSE ACETATES, TEMPERATURE, STRAIN RATE, IMPACT SHOCK, TOUGHNESS, STRESSES, IMPACT TESTS

Subject Categories : Ammunition and Explosives
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE