Strain hardening behavior of HDPE geomembranes

Zanzinger, H.; Engelsing, Kurt; Gerets, Britta

doi:10.1051/e3sconf/202336802009

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Strain-hardening phenomenon is known to be a suitable appraisal of HDPE stress cracking resistance as shown in some studies. 51–53 In Figure 3B, the post-drawing part completely disappeared for most of OL specimens. Consequently, both strain-hardening and chain rearrangement towards a totally orientated material turned out to be undiscernible.…”

Section: Resultsmentioning

confidence: 99%

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Alimi,

Chaoui

2024

Journal of Elastomers & Plastics

View full text Add to dashboard Cite

High Density Polyethylene (HDPE) is one attractive technical option for the transportation and distribution of natural gas and hydrocarbons given the advantages in long-term mechanical strength, lifespan, maintenance costs and resistance to chemical aging. This study investigates the compatibility of extruded pipe material from copolymerized HDPE-80 with DOT 3 brake fluid. Machined standard specimens from inner (IL) and outer (OL) pipe layers are aged in commercial synthetic polyglycol-based oil for 7 days at laboratory conditions. The percent mass changes are +2.2% and +1.9% respectively for IL and OL pipe surfaces. These results are in the same range of published sorption data for other oils and fuels. Stress-strain parameters (E, σ y, σ CD, σ f, ε y, Δ ε CD, ε f) and fracture work are established and thoroughly discussed for both pipe sides. For IL, the reduction of E, σ y and ε f are respectively 28.0%, 13.9% and 22.7%, while for OL they are 22.6%, 7.7% and 25.1%. Globally, it is concluded that strength properties degradation in DOT 3 oil is more important for IL compared to OL. There is an important loss of ductility for both pipe sides. Ageing caused IL crystallinity ( Xc) to increase while OL showed inverse results probably because of frozen anti-oxidants in the outer surface layers following water quenching during extrusion. Before and after ageing, the as-received OL is found to be more resilient to oxidation than corresponding IL, as higher OIT parameters are also shown in the case of crude oil compatibility investigations. DOT 3 brake oil seem to accelerate the degradation of HDPE-80 thermal stability with a higher intensity for IL.

show abstract

Section: Resultsmentioning

confidence: 99%