GB/T 41794-2022Geosynthetics—Evaluation of stress crack resistance of polyolefin geomembranes—Notched constant tensile load method (English PDF)
土工合成材料 聚烯烃土工膜耐应力开裂性能的评价 切口恒定拉伸负荷法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 14, 2022
Implementation date
May 1, 2023
Scope
GB/T 41794-2022 is the English-translated version of 土工合成材料 聚烯烃土工膜耐应力开裂性能的评价 切口恒定拉伸负荷法.
GB/T 41794-2022 is the Chinese national notched constant tensile load method for judging how well a polyolefin geomembrane resists stress cracking. A dumbbell-shaped specimen is cut from the membrane and notched across its narrow parallel part until the remaining thickness reaches the specified value.
It is then held under constant tension in an aqueous surfactant solution at a set temperature until it breaks or the set time is reached, and the time or number of fractures is recorded.
The tester is a heated box with water circulation, a specimen holder, a timer, a lever and weights. It applies to geomembranes made from polyolefin resin with additives, and to those resins.
It cites GB/T 1040.3, GB/T 2035, GB/T 6672, GB/T 9352, GB/T 13760 and GB/T 17643, was issued on 14 October 2022 and has applied since 1 May 2023.
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Document preview — GB/T 41794-2022
National Standard of the People's Republic of China
- ICS
- 83.140.10
- Classification
- G 33
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Principles
- 5 Equipment and reagents
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.
1 Scope
This document specifies the method for evaluating the stress cracking resistance of polyolefin geomembranes (hereinafter referred to as "geomembrane") using the notch constant tensile load method. testing method.
This document is applicable to the evaluation of stress cracking resistance of geomembranes produced with polyolefin resin as raw material and adding various additives. Book The document is also applicable to the evaluation of the stress cracking resistance of resins for polyolefin geomembranes.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 1040.3 Determination of Tensile Properties of Plastics Part 3: Test Conditions for Films and Sheets
GB/T 2035 Plastic Terms and Definitions
GB/T 6672 Plastic Film and Sheet Thickness Determination Mechanical Measurement Method
GB/T 9352 Compression molding of plastic thermoplastic material samples
GB/T 13760 Geosynthetics Sampling and Sample Preparation
GB/T 17643 Geosynthetic Polyethylene Geomembrane
3 Terms and Definitions
The terms and definitions defined in GB/T 2035 and GB/T 17643 and the following terms and definitions apply to this document.
3.1 Notch constant tensile load test
A constant tensile stress is applied to the specimen with a certain depth of cut until the specimen fails or the specified time is reached.
Note: Notch constant tensile load test, referred to as NCTL test.
4 Principles
Cut a dumbbell-shaped sample from the geomembrane, make an incision in the narrow and parallel middle of the sample, and make the remaining thickness of the sample reach the specified value, perpendicular to the length of the sample. A constant tension is applied to the specimen in an aqueous surfactant solution at a specified temperature until fracture or specified During this time, record the time or the number of fractures of the specimen.
5 Equipment and reagents
5.1 Stress crack tester
The stress cracking tester is mainly composed of a box with built-in heating and water circulation device, a sample holder, a timer, a lever and a counterweight, as shown in Figure 1.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 1040.3Plastics—Determination of tensile properties—Part 3:Test conditions for films and sheets
- GB/T 2035Plastics - Vocabulary
- GB/T 6672Plastics film and sheeting - Determination of thickness by mechanical scanning
- GB/T 9352Plastic -- Compression moulding of test specimens of thermoplastic materials
- GB/T 13760Geosynthetics -- Sampling and preparation of test specimens
- GB/T 17643Geosynthetics - Polyethylene geomembrane
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Related Standards
GB/T 1040.3-2006 — Plastics -- Determination of tensile properties -- Part 3: Test conditions for films and sheets
GB/T 1040.3-2026 — Plastics—Determination of tensile properties—Part 3:Test conditions for films and sheets
GB/T 13760-2009 — Geosynthetics -- Sampling and preparation of test specimens
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