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A METHODOLOGY TO DETERMINE CHARPY IMPACT STRENGTH OF NOTHCED SPECIMEN CUT FROM PLASTICS PIPES

 

Li, Yanjun, Xiang, Aimin, Xu, HaiyunBeijing, Xie, Jianling, Ho, Kinman, Xu, HaiyunBeijing

# 2021 Amsterdam

It is necessary to evaluate the impact resistance of plastics pipes as they have the potential to be damaged by hitting or colliding during storage, transportation and installation. As a well-established test method, the Charpy impact strength of unnotched test pieces cut from thermoplastics pipes is determined according to ISO 9854-1/2:1994. In the current method, the result is expressed as the incidence of broken test pieces when a specified number of test pieces have been struck. Since most specimens are not broken and the actual impact strength cannot be obtained under the test conditions, there is no significant difference found on the impact strength among various plastics pipes materials. This paper introduces a new approach in which notched test pieces sampled from plastics pipes are used to assess the impact performance of plastics pipes basing on ISO 179-1:2010 and ISO 9854- 1/2:1994. Preliminary test results indicate that the method offers a more effective means (quantitative) to determine the actual impact strength of various plastics pipes. Furthermore, the impact resistances of various pipes materials are clearly distinguishable. The test results offer reference data for improving plastic pipe production and selection of plastic materials. Total 12 participants from 4 countries, including China, Germany, Korea and Thailand, took part in the round robin test and 143 test results were submitted in all. Total 13 groups of pipes were used to make the specimens, including 4 groups of PE pipes of 4 sizes (dn113 × 11.2mm, dn113 × 7.8mm, dn88 × 9.4mm and dn60.5 × 5.9mm), 7 groups of PP pipes of 3 sizes (dn32 × 3.6mm, dn25 × 3.5 and dn25 × 2.3mm) and 2 groups of PVC-U pipes of 2 sizes (dn160 × 9.5 and dn110 × 3.2mm).

Related keywords : Thermoplastics pipes, Notched specimen, Charpy impact, Impact strength.
Please note that the whole article content is available on PPCA website only


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