Temperature–strain rate transformations with isotactic polypropylene at finite strains

摘要

AbstractThe possibility of applying Ferry's superposition principle to the entire stress‐strain curve of oriented isotactic polypropylene is studied. Sufficient data to prove the applicability of the principle is not available, but from published information it is shown that if superposition is valid for this material, then the shift factors are independent of strain and apply to the breaking extension as well as points along the stress–strain cu