Stress Cracking in HDPE Geomembranes

STRESS CRACKING BEHAVIOR OF HDPE GEOMEMBRANES AND …

Geomembranes made from high density polyethylene (HOPE) have a high percent crystallinity and are therefore of concern with regard to stress cracking. A review of the literature plus our field exhuming of various sites-of-opportunity gave rise to twenty-five (25) situations where stress cracking of HDPE geomembranes has occurred since the introduction of this liner material in 1980.

Stress Cracking Behavior of HDPE Geomembranes and its ...

In contrast, there was much less variation in the transition stress, the variation ranging from 28% to 40% of yield stress. Thus it was concluded that transition time should be the parameter of choice for com- paring and contrasting stress cracking resis- tance of different HOPE geomembranes.

Eliminating Geomembrane Stress Cracking - Geosynthetica

Apr 12, 2013 · We have made great improvements (specified NCTL times from 200 to 1000 hr) since the 1980s when there were extensive slow crack growth (SCG) and rapid crack propagation (RCP) or “shattering” failures in exposed HDPE geomembranes.

Effect of aging on the stress crack resistance of an HDPE ...

HDPE geomembranes are prone to stress cracking when subject to tensile stress less than their short-term mechanical yield strength , , . This type of failure takes a long-time and varies depending on the geomembrane resin (polyethylene resin and additives ). Geomembrane cracking starts with small cracks formed by slow crack growth.

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Evaluation of the stress cracking resistance of exposed ...

Stress cracking (SC) of high-density polyethylene (HDPE) geomembrane s (GMB) was a problem in the 70’s and 80’s of the last century. After specifying a stress cracking re sistance (SCR) on the...

(PDF) Evaluation of stress cracking on geomembranes after ...

Geomembranes made from high-density polyethylene (HDPE) have a relatively high percent crystallinity, and are therefore of concern with regard to stress cracking.

Get a Handle on Stress-Cracking In HDPE Bottles : Plastics ...

Aug 01, 2008 · During the summer months, stress-cracking of HDPE containers reaches its peak. This is because stress from different sources increases during the summertime. Premature cracking can be caused by top-load stress, internal pressure, molded-in stress, and tail swing.

Author: Robert Delong

XR® Geomembranes Vs. HDPE Membranes

Environmental Stress Cracking (ESC): HDPE has this inherent problem identified by the EPA. XR-5 geomembranes are not subject to ESC. Flexibility for Prefabrication and Ease of Installation: Prefabrication of XR-5 Geomembranes allows for improved liner integrity and significantly reduces the number of field seams. HDPE is too rigid to prefab.

TECHNICAL NOTE Stress Crack Resistance for Geomembrane ...

Stress Crack Resistance for Geomembrane Products. The stress crack resistance (SCR) of polyethylene (PE) geomembranes has been the subject of study since the introduction of the materials over 20 years ago. It is well known from the pipe and cable insulation industries that PE can stress crack …

Eliminating Geomembrane Stress Cracking - Geosynthetica

Apr 12, 2013 · We have made great improvements (specified NCTL times from 200 to 1000 hr) since the 1980s when there were extensive slow crack growth (SCG) and rapid crack propagation (RCP) or “shattering” failures in exposed HDPE geomembranes.

HDPE Geomembrane Stress Cracking: From There to Here to ...

Stress cracking (SC) in high density polyethylene (HDPE) has been a problem, an interesting research topic, and an agent for improved geomembrane performance. The Geosynthetic Research Institute and Professor Robert Koerner have been front and center in this effort over the years since about 1984.

Effect of aging on the stress crack resistance of an HDPE ...

HDPE geomembranes are prone to stress cracking when subject to tensile stress less than their short-term mechanical yield strength , , . This type of failure takes a long-time and varies depending on the geomembrane resin (polyethylene resin and additives ). Geomembrane cracking starts with small cracks formed by slow crack growth.

(PDF) Evaluation of stress cracking on geomembranes after ...

Geomembranes made from high-density polyethylene (HDPE) have a relatively high percent crystallinity, and are therefore of concern with regard to stress cracking.

HDPE Geomembrane Specification and Performance …

The high crystallinity of HDPE makes it susceptible to stress cracking, however that is the same feature that gives HDPE its chemical resistance. Photos of examples of these type of failures were included in his paper and are reproduced below. Worth noting is that the majority of these geomembranes, when tested, met the GRI GM 13 specification.

TECHNICAL NOTE Stress Crack Resistance for …

Stress Crack Resistance for Geomembrane Products. The stress crack resistance (SCR) of polyethylene (PE) geomembranes has been the subject of study since the introduction of the materials over 20 years ago. It is well known from the pipe and cable insulation industries that PE …

EVALUATION OF STRESS CRACKING ON GEOMEMBRANES …

in using HDPE geomembranes is their susceptibility to stress cracking (SC) which, in turn, is a consequence of their high crystallinity [2, 16, 6, 13, 15]. The evaluation of stress cracking is performed according to ASTM D5397 [17]. The test is called Notched Constant Tensile Load (NCTL) and uses notched dumbbell shaped

Authors: Fernando Luis Lavoie · Souza Bueno · Paulo Cesar LodiAffiliation: University of Sao Paulo · Sao Paulo State University

Research Update on Geomembranes at Tailings Storage ...

Sep 06, 2017 · Geomembranes are designed to resist degradation from exposure to UV rays, extreme temperatures and chemical reactions (including oxidation), and they must be strong and flexible to prevent stress cracking if they are folded or strained under significant loads.

The oxidation and mechanical performance of HDPE ...

nificance in exposed geomembranes and probably for primary liners in bioreactors. In bioreactors temperatures are higher and the settlement of the waste may induce higher stresses in the HDPE geomembranes. Stress cracking is accelerated at higher temperatures, as is oxidation. The oxidation resistance of a geomembrane is usually defined

Environmental Stress Crack Resistance of Polyethylene

Environmental Stress Crack Resistance of Polyethylene Introduction to Environmental Stress Cracking and ESCR Over the past decade, high-density polyethylene (HDPE) materials have improved significantly and now meet more stringent performance standards. Some performance evaluation tests that once took only days to run now take months with today’s

Geomembrane - Professional Geomembrane Manufacturers ...

Description. Geommebrane is the low permeability liner made of high grade polyethylene raw material, adding carbon black, antioxidant, anti-aging and UV-resistance component. It is the most widely used geosynthetic membrane which features e xcellent chemical resistance, o utstanding stress crack capacity, l owest permeability and e xcellent UV resistance.

Geomembranes in landfills: Overview of liners, caps and ...

Stress cracking is a brittle cracking that occurs at a constant stress lower than the tensile yield or break stress of the material. It was found that SC is a function of the formulation of the resin and therefore can be quite different in HDPEs from different geomembrane manufacturers.

Geomembrane-Liner Testing: The Practical World

Now PVC geomembranes are being fusion welded and can be held to similar principles as HDPE. In the mid-1980s, as a result of investigations of stress-cracking failures in HDPE geomembranes, I introduced the requirements for a minimum elongation in the shear test and a …

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3.1 This guide covers the stress crack resistance of HDPE geomembranes. According to ASTM D 883, stress crack is defined as "an external or internal crack in a plastic caused by tensile stresses less than its short-time mechanical strength." 3.2 This guide focuses on those geomembranes produced from virgin polyethylene in the