Brittle-tough transition of rapid crack propagation in polyethylene

被引：25
作者：
Ritchie, SJK [1 ]
Davis, P [1 ]
Leevers, PS [1 ]
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2BX, England
来源：
POLYMER | 1998年 / 39卷 / 25期
基金：
英国工程与自然科学研究理事会;
关键词：
brittle; tough; shear;
D O I：
10.1016/S0032-3861(97)10336-6
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The brittle-tough transition of rapid crack propagation in pressurised polyethylene pipes is examined. The transition is correlated with the presence of shear lips. Two new tests are described and then used to examine the mechanism of sheer lip formation. The mechanism is found to be largely governed by the post-yield drawing behaviour of the polyethylene and is sensitive to both rate and temperature. The degree of drawing before failure is discussed from a micro-structural viewpoint and is shown to depend, at least in part, on lamella size and hence processing conditions. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：6657 / 6663
页数：7
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