Fatigue crack growth in lithium hydride

Thesis/Dissertation · Wed Sep 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/95360· OSTI ID:95360

Healy, Thomas E. ^[1]

---

1. Univ. of California, Davis, CA (United States)

Subcritical fatigue crack growth, from cyclic tensile loading, was demonstrated in warm pressed Polycrystalline lithium hydride. Experiments were performed with cyclic tension-tension crack opening (mode I) loads applied to a pre-cracked compact type specimen in an argon environment at a temperature of 21°C (70F). The fatigue crack growth was found to occur between 7.56 x 10^II M/cycle (2.98 x 10^-9 in/cycle) and 2.35 x 10^-8 m/cycle (9.24 x10^-7 in/cycle) for a range of stress intensity factors between 1.04 MPa•√m (0.95 ksi•√in) and 1.49 MPa•√m (1.36 ksi•√in). The rate of fatigue crack growth from cyclic tensile loading was found to be in excess of crack growth from sustained loading at an equivalent stress intensity factor. Furthermore, a fatigue threshold was not evident from the acquired data.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 95360
• Report Number(s): UCRL-LR-120744; ON: DE95014373
• Resource Relation: Other Information: TH: Thesis (M.S.); PBD: 1 Sep 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION
LITHIUM HYDRIDES
FATIGUE
CRACK PROPAGATION