Fatigue crack growth in lithium hydride
- 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 10II 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
- Country of Publication:
- United States
- Language:
- English
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