Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)
- 2002.05a
- /
- Pages.130-133
- /
- 2002
AE characteristic of PE pipe under tensile test
PE 배관의 인장시험 동안 발생한 AE 특성
- Jeong, Jeong-Hwan (Graduate School of Materials Science and Engineering, Pukyong National University) ;
- Nam, Ki-Woo (Division of Materials Science and Engineering, Pukyong National University) ;
- Ahn, Seok-Hwan (School of Mechanical Engineering, Pukyong National University) ;
- Park, In-Duck (Division of Materials Science and Engineering, Pukyong National University)
- Published : 2002.05.17
Abstract
Polyethylene pressure pipe has been used with a gas pipe material because of workability and stability etc.. Researches on characteristics of polyethylene pressure pipe are carried out, but there are rare. In this study, the tensile test was performed on polyethylene pipe. From the tensile test, AE signals were detected and estimated in real time. Also, the time-frequency analysis of AE signals was analyzed. From test results, PE pipes were displayed typical stress-strain curves oj semi-crystalline polymer. As result analyzed AE signals, could divide stress-strain curves could be divided into four stages. In the elastic region, signals were not detected. Low amplitude distributions of 30-35dB appeared after yielding, and high amplitude distributions of 30-60dB appeared with increased extension. From the time-frequency analysis of AE signals, the frequency band of 100kHz appeared mainly. Also, the frequency band of 300kHz appeared before the necking phenomenon spreads into the whole region, and the frequency band of 500kHz appeared on extension earlier.
Keywords