Mixed-mode creep cracking
- Univ. of Pennsylvania, Philapelphia, PA (United States)
Recently, problems in interfacial fracture have lead to a general interest in planar crack growth under mixed-mode loading conditions. Of particular interest is the relationship between the applied stress intensity/mode-mix and the corresponding quantities near the crack tip. Asymptotic and small-scale yielding solutions for crack growth in a time-independent elastic-plastic material predict that the mode mix (tension versus shear) in the vicinity of the crack tip can only take on discrete values rather than varying continuously with the mode mix of the remotely applied elastic fields. Consequently, the near-tip mode mix, which is usually tensile in nature, is weakly dependent on the far field mix, and this has implications for cracking resistance. In the creep case, in either homogeneous materials or along interfaces we have found crack-tip solutions which admit a continuous variation of mode mix. These solutions are in good agreement with small-scale-yielding finite element calculations that include the transient growth period. Implications for grain-boundary cracking in polycrystalline materials will be discussed.
- OSTI ID:
- 175204
- Report Number(s):
- CONF-950686--
- Country of Publication:
- United States
- Language:
- English
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