ASTM D5397 Notched Constant Tensile Load Test for Geosynthetics Polyethylene, Geomembrane Stress Crack

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ASTM D5397: Standard Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test

ASTM D5397 test method is used to develop test data from which the susceptibility of polyolefin geomembrane sheet material to stress cracking under a constant tensile load condition and an accelerated environmental condition can be evaluated. This test method measures the failure time associated with a given test specimen at a specified tensile load level. Results from a series of such tests utilizing a range of load levels can be used to construct a stress-time plot on a log-log axis.

Related standard:

IS 16346-2015 Geosynthetics - Method of Test for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test

NSF 54 : 1993 Notched Constant Tensile Load Test equipment for FLEXIBLE MEMBRANE LINERS Stress Crack Resistance test

These test places a dumbbell shaped test specimen of HDPE with a central notch under a constant tensile load (30% of the yield strength) in a wetting agent at 50°C. This is a more stringent test. The specimen is kept in tension throughout the test. The Geosynthetic Research Institute (GRI) has an internationally recognised specification for HDPE geomembranes (Geosynthetic-institute.org, 2016), in which the ESCR value tested to ASTM D5397 must be greater than 500 hours.

ASTM D5397 Notched Constant Tensile Load Test for Geosynthetics Polyethylene, Geomembrane Stress Crack Resistance test

ASTM D5397 Notched Constant Tensile Load Test Summary:

The testing method involves subjecting dumbbell shaped notched specimens of polyolefin sheets to a constant tensile load at high temperatures in the presence of surfactants. Regularly conduct separate tests for each working position, and conduct parallel tests for every three positions as a group, with each group loaded with different yield stresses; Equipped with automatic temperature control and elevated water bath; 30 workstations, supporting 10 sets of tests under 20% -65% yield stress, with automatic calculation of load mass for each set; Provide two methods for determining time sequence and damage time; During or after testing, you can view the fracture time and average fracture time of each specimen under all stresses for the purpose of analyzing the results.

Test sample

The "NCTL" testing method places the specimen under different constant tensile loads and applies 20% -65% of the material's yield strength to the dumbbell shaped specimen. Before the sample test, a groove should be cut to a depth of 20% of the sample thickness, and then immersed in a surface active agent with a concentration of 10% at a temperature of 50 ° C. During this accelerated aging process, measure the time for sample destruction and plot the results as a load and destruction time graph. NCTL provides information on material plastic failure and brittle failure. The resistance of materials to stress cracking strength is the transition time between two failure modes.

Sample preparation and installation

Take samples in a specific direction using the provided cutting tools.

The sample thickness is 20%, and the notch device is placed in the middle of the sample along the vertical width direction.

The sample has installation holes with punching devices at both ends.

Secure all protective covers onto the mounting holes.

Install the sample onto the sample hook. (Install the hook first).

Test report

Complete identification of test materials

Report average failure time and coefficient of variation values

If I miss anything about the notch constant tensile load tester. Alternatively, if you have more detailed information, you can send an email to export@unitedtest.com

Notched Constant Tensile Load Test, Stress Crack Resistance test method is used to develop test data from which the susceptibility of polyolefin geomembrane sheet material to stress cracking under a constant tensile load condition and an accelerated environmental condition can be evaluated.

When it comes to enhancing the performance and durability of polyolefin geomembranes, the importance of rigorous testing cannot be overstated. At Beijing United Test Co.,Ltd. , we offer advanced testing solutions that comply with ASTM D5397 standards, specifically designed to optimize stress cracking strength and ensure the highest quality in your geomembrane applications.

Understanding the Importance of Stress Cracking Strength

Stress cracking is one of the most critical failure mechanisms affecting polyolefin materials. When subjected to constant load, these materials can develop cracks that propagate rapidly, ultimately leading to material failure. Our testing methodology provides essential insights into this behavior, allowing for comprehensive assessments that inform the development of stronger and more resilient geomembranes. By optimizing the stress cracking strength, you can enhance the lifespan and reliability of your projects, reducing the risk of unforeseen failures and costly downtimes.

Our Notched Constant Tensile Load Testing Equipment: ASTM D5397 Compliant

We pride ourselves on utilizing cutting-edge testing equipment that adheres to the rigorous standards set by ASTM D5397, the widely acknowledged benchmark for testing the stress cracking resistance of plastic materials.

Our equipment is designed to provide accurate, repeatable, and reliable results under controlled conditions, ensuring that your geomembrane products meet and exceed industry expectations.

Features of Our Testing Equipment:

Precision Engineering: Our testing apparatus is engineered to ensure exact replication of conditions that geomembranes might face in real-world applications. This precision guarantees that our evaluations are reflective of actual material performance.

Controlled Environment: Tests are conducted in a controlled environment, eliminating external variables that might skew results. This focus on optimal conditions allows for more decisive insights into the material's capabilities.

Comprehensive Data Processing: We utilize advanced data processing techniques to analyze fracture times accurately, providing you with detailed reports that facilitate informed decision-making.

The Notch Constant Load Tensile Test: A Key Component

To effectively measure the stress cracking strength of polyolefin geomembranes, we employ a notch constant load tensile test. This specific test method is crucial because it simulates conditions that geomembranes typically encounter, involving exposure to stress over extended periods.

How the Test Works:

Sample Preparation: Polyolefin samples are prepared with precise notches, which act as stress concentrators, encouraging crack formation under load.

Loading Conditions: The samples are subjected to a constant load while being monitored in a controlled environment that mirrors potential field conditions.

Fracture Time Measurement: The time taken for a crack to propagate from the notch to failure is meticulously recorded and analyzed, providing valuable data on stress cracking resistance.

Trustworthy Evaluations for Enhanced Durability:

At UnitedTest, our goal is to provide evaluations you can trust. The results from our ASTM D5397-compliant testing are designed to give you confidence in your geomembrane materials. By understanding the fracture behavior under specific loads and conditions, you can make informed choices that directly impact the durability and longevity of your projects.

Benefits of Our Testing Services:

Enhanced Material Selection: Our precise assessments empower you to choose the right geomembrane products tailored to your project's specific needs.

Diminished Risk of Failure: Knowledge of a material’s stress cracking performance allows for proactive measures, minimizing the risk of failure in critical applications.

Improved Overall Performance: By optimizing the stress cracking strength, you not only enhance the individual performance of geomembranes but also contribute to the overall success of your project.

Applications of Optimized Polyolefin Geomembranes

Our stress cracking strength optimization services serve a wide range of industries and applications, ensuring that your geomembrane materials are fit for purpose. Whether you're involved in construction, water management, mining, or landfill applications, our testing services provide assurances that your materials are ready to withstand the challenges they will face.

Industries Benefiting from Our Testing:

Environmental Protection: Ensure that your geomembranes effectively manage and contain hazardous materials, protecting surrounding ecosystems.

Water Infrastructures: Maximize the reliability of geomembranes in water containment systems such as ponds, reservoirs, and canals.

Landfill Liners: Optimize geomembranes for landfill applications to provide robust barrier systems against leachate, preserving groundwater quality

For those seeking to enhance the durability and performance of polyolefin geomembranes, UnitedTest's ASTM D5397-compliant testing services offer a vital resource. Through our notch constant load tensile tests, we can provide you with comprehensive analyses of fracture times, empowering you with the knowledge to make informed decisions regarding your material selections.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you