Abstract
Polyethylene, as non-polar material, shows a high affinity especially to liquid non-polar aromatic and aliphatic hydrocarbons, and liquid hydrocarbons (LHC) to a certain extent migrate into the bulk material by sorption, leading to material plasticization (i.e., drop in modulus and yield stress). This paper aims to study the crack growth mechanism and failure behavior of commercial pipe grade materials when exposed to deionized water or LHC (90/10 wt% i-octane/toluene) under the simultaneous application of cyclic loads. The results of the cyclic crack growth experiments with three PE100 pipe grades, using cracked round bar (CRB) specimens and performed at two different temperatures (35 °C and 60 °C), are compared in terms of the specimen lifetimes, and the micro-modes and kinetics of failure by referring to concepts of fracture mechanics. Most importantly, while crack advance is preceded by crack-tip crazing in water, shear yielding takes place at crack-tips in the LHC environment.
| Original language | English |
|---|---|
| Pages (from-to) | 90-101 |
| Number of pages | 25 |
| Journal | International Journal of Fatigue |
| DOIs | |
| Publication status | Published - 2014 |
Fields of science
- 205 Materials Engineering
- 205011 Polymer engineering
- 205016 Materials testing
- 207106 Renewable energy
- 211908 Energy research
- 103023 Polymer physics
- 104018 Polymer chemistry
- 211909 Energy technology
- 104019 Polymer sciences
JKU Focus areas
- Nano-, Bio- and Polymer-Systems: From Structure to Function