THE EFFECTS OF PHYSICAL AGING ON THE BRITTLE-FRACTURE BEHAVIOR OF POLYMERS

被引：36

作者：

ARNOLD, JC

机构：

[1] Polymers and Composites Centre, Department of Materials Engineering, University College of Swansea, Swansea, Singleton Park

来源：

POLYMER ENGINEERING AND SCIENCE | 1995年 / 35卷 / 02期

关键词：

D O I：

10.1002/pen.760350207

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The effects of physical aging on the failure behavior of a typical brittle polymer, polystyrene, have been studied. Properties examined were creep rupture lifetimes, fatigue lifetimes, and environmental stress cracking in ethanol. Fractured samples were examined both optically and by scanning electron microscopy to determine the degree of crazing. It was found that a longer physical aging time produced shorter lifetimes in all cases. The main reason for this is the reduction in craze strength caused by a reduced toughness due to physical aging. A long aging time was found to delay craze formation, but once formed, these crazes were much less stable than those formed with a short aging time. The effects of aging are important on failure prediction criteria and on testing methodologies, and the implications are discussed.

引用

页码：165 / 169

页数：5