Yielding processes in glassy polymers

摘要

AbstractOur contribution deals with a description of yield in glassy polymers, being treated as an activated process. For description the Eyring equation in simplified form has been selected:(1)documentclass{article}pagestyle{empty}begin{document}$$ sigma _y = A - BT + CT.log dot varepsilon $$end{document}where σy= yield stress,T= absolute temperature,documentclass{article}pagestyle{empty}begin{document}$ dot varepsilon = {rm deformation (strain) rate,}$end{document}andA,B,C= equation parameters. In the first part the applicability of this equation has been verified by applying data of our own as well as those published elsewhere. For a more comprehensive representation of the results the data were processed in the form of generalized master curves by using the appropriate shift factors derived from eq. (1)