Okamoto, Akiyama, Wasada, Komukai
Additional Information - Posters # 1998 Gothenburg
Resistance of PE gas pipes to rapid crack propagation (RCP) was evaluated by S4 testing and a correlation of ductile brittle transition temperature between S4 testing and Charpy impact testing was investigated.
S4 tests for Japanese domesticmade PE gas pipes (medium density) of five materials and three outer diameters (100, 150, and 200 mm, SDR 13.5) were carried out at temperatures from -30 "C up to 10 "C. A critical pressure that is the highest pressure at which the crack will not propagate and a critical temperature above which RCP does not occur were obtained by S4 tests. And S4 critical temperature correlated with ductile brittle transition temperature by the Charpy impact test.
S4 critical pressure and temperature were influenced by materials and pipe diameters. Ductile brittle transition temperature using the Charpy impact test was affected by materials, sampling position and direction from pipe and dimensions of specimen. An order of RCP resistance for each material by S-l critical temperature and ductile brittle transition temperature using the Charpy impact test was observed rough intensity.