弹性体挤出流动中第一法向应力差的预测

PREDICTIONS OF PRIMARY NORMAL STRESS DIFFERENCE FOR ELASTOMERS IN EXTRUSION FLOW

本文探讨了如何通过聚合物熔体流变特性参数的测量来估算挤出流动中第一法向应力差Ｎ１的问题。简要评述了这方面研究的进展。提出了两个描述Ｎ１与其他流变参数如挤出胀大比的关系式。

This paper deas with the problem of evaluating the first normal stress difference(N. )in extrusion flow through measurements of the rheological parameters of polymer melts. A brief summary is provided on the advances in this field. Two equations describing relation between N1 and otner rheological parameters such as die-swell ratio are presented,and comparison and analysis are made.