Abstract
Crack initiation in pipe grade polyethylene is studied using a circular notch specimen (CNS) under constant load. The specimen geometry and loading conditions are selected in a way that the crack becomes unstable and leads to almost instant fracture after initiation. Therefore the time of crack initiation practically coincides with easily recorded time to failure. The crack initiation takes place within a process zone (PZ) coplanar with the notch and extending from the front of the notch. Two sub-zones are distinguished within PZ. The first, located in the frontal part of PZ comprises of a planar set of micro cavities within a thin strip of material coplanar with the notch. The second, constituting the rest of PZ, consists of micro fibers and membranes resulting from cold drawing of the material between the cavities. With time creep & degradation of micro fibers and membranes leads to crack initiation. Results of experimental observation and an approach to modeling of crack initiation in CNS are reported.
| Original language | English |
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| Pages | 2485-2489 |
| Number of pages | 5 |
| Publication status | Published - 2006 |
| Externally published | Yes |
| Event | Society of Plastics Engineers Annual Technical Conference 2006, ANTEC 2006 - Charlotte, NC, United States Duration: 2006 May 7 → 2006 May 11 |
Other
| Other | Society of Plastics Engineers Annual Technical Conference 2006, ANTEC 2006 |
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| Country/Territory | United States |
| City | Charlotte, NC |
| Period | 06/5/7 → 06/5/11 |
ASJC Scopus subject areas
- Chemical Engineering(all)
- Polymers and Plastics