NASA Technical Reports Server (NTRS) 20060008099: Fatigue Crack Growth Rate of Inconel 718 Sheet at Cryogenic Temperatures

by: NASA Technical Reports Server (NTRS)

Publication date: 2005-12-01

Topics: NASA Technical Reports Server (NTRS), LIQUID HYDROGEN, INCONEL (TRADEMARK), CRACK PROPAGATION, COLD GAS, SUBMERGING, HELIUM, Wells, Douglas, Wright, Jonathan, Hastings, Keith,

Collection: NASA_NTRS_Archive; additional_collections

Language: English

Inconel 718 sheet material was tested to determine fatigue crack growth rate (FCGR) at cryogenic conditions representative of a liquid hydrogen (LH2) environment at -423 degree F. Tests utilized M(T) and ESE(T) specimen geometries and environments were either cold gaseous helium or submersion in LH2. The test results support a significant improvement in the fatigue crack growth threshold at -423 degree F compared to -320 degree F or 70 degree F.