Effect of crystalline morphology on fatigue crack propagation in polyethylene |
| |
Authors: | J Runt M Jacq |
| |
Affiliation: | (1) Department of Materials Science and Engineering, Polymer Science Program, The Pennsylvania State University, 16802 University Park, Pennsylvania, USA |
| |
Abstract: | An investigation of the influence of crystalline morphology on fatigue crack propagation (FCP) resistance in a slightly branched
polyethylene is presented. Various thermal histories have been utilized to generate samples with different crystalline microstructures
and the samples were characterized thoroughly using standard methods. Estimation of tie molecule densities was obtained from
measurements of brittle fracture stress. Differences in FCP behaviour for the quenched and annealed samples were shown to
be dictated by a competing effect between the degree of crystallinity and tie molecule density. Further, larger spherulite
size and distribution appeared to have a deleterious effect on fatigue properties. In general, crystalline microstructure
is shown to have a significant influence on fatigue crack propagation behaviour. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|