The Pressure and Temperature Effects on Brittle to Ductile Transition in PS and PMMA
Abstract
Tensile experiments in polystyrene (PS) and poly(methyl methacrylate) (PMMA) conducted at constant strain rate over a wide range of pressure and temperature have shown that a brittle to ductile transition is induced in these amorphous polymers by the superposition of hydrostatic pressure as well as by the raise of the experimental temperature. A detailed stress-strain analysis permits explanation of the mechanism for the brittle to ductile transition in terms of interaction between two competing processes of plastic yielding -- crazing and shear banding phenomena. The crazing and shear banding processes respond quite differently to changes of pressure or temperature. The evidence that the brittle to ductile transition pressure becomes lower with increasing temperature refutes a previously suggested concept that the transition relates primarily to mechanical relaxation phenomena.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 05, 1975
- Accession Number
- ADA015237
Entities
People
- E. Baer
- K. Matsushige
- S. V. Radcliffe
Organizations
- Case Western Reserve University