Plastic Pipes Conference Association # 2023 Lake Buena Vista
Yanlei Hu, Jin Sun
Slow crack growth is the main reason for brittle failure of polyethylene pipes. At present, the traditional slow crack growth test generally has many problems, such as too long test time, using chemical reagents that pollute the environment, poor reproducibility, etc., which limit the accurate evaluation of the slow crack growth resistance of polyethylene pipe special materials, and reduce the development speed of polyethylene pipe special materials. With the rapid development of special materials for pipes in recent years, new alternative evaluation methods with short development time and no pollution have become an urgent demand in the industry. CRB (Cracked Round Bar) test just meets the above requirements. CRB test can be carried out at room temperature without surfactant. At the same time, CRB test has advantages of shortening test time, reducing test time, reducing test time cost, high reliability and good repeatability of test results.
Existing researches on CRB test are carried out by changing different samples, and seldom study the influence of sample preparation method, sample size and test parameters on the test results. This paper studies the influence of these factors on CRB test results through different sample preparation methods (compression molding, injection molding and sample preparation from pipe samples by machining), different sample sizes (sample diameter and notch depth) and different test conditions (temperature, load ratio, frequency), and selects the best test conditions to achieve the best results.
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