China Plastics ›› 2018, Vol. 32 ›› Issue (09): 96-101.DOI: 10.19491/j.issn.1001-9278.2018.09.016

Previous Articles     Next Articles

Research on Correlation of Strain Hardening Modulus and Crack Growth Rate of Polyethylene Pipes

  

  • Received:2018-03-30 Revised:2018-04-20 Online:2018-09-26 Published:2018-10-25

Abstract: Slow crack growth (SCG) is one of the main reasons for the brittle failure of polyethylene (PE) pipes. The SCG resistance of PE pipes should be evaluated strictly before formally service. In this paper, the strain-hardening modulus and crack growth rate of different types of PE pipe specimens (PE100) were obtained from strain-hardening and cone tests, respectively, and their correlation was studied to verify the validity of strain-hardening test for the evaluation of slow crack growth resistance of PE pipes. The results indicated that the crack growth degree of PE pipe specimens increased with an increase of test time, and the strain-hardening test results for different PE pipe specimens were identical to the cone test ones. The validity of strain-hardening test method for the evaluation of slow crack growth performance of PE pipes was also confirmed. The strain-hardening test not only had a small error but also made the subtle differences of slow crack growth resistance distinguished from different brands of PE100 pipes. The strain-hardening test results were more reliable than those of the cone ones.