Experimental investigation of crack path directional stability
Using the criterion that a crack will extend perpendicular to the maximum circumferential stress, it is shown that the directional stability of crack growth is governed by the location of micro-crack initiation ahead of the crack tip. At distances greater than a geometrical radius r/sub 0/ the maximum value of sigma/sub theta/ deviates from the position of symmetry. Thus, if it is assumed that the physical processes involved in fracture lead to crack initiation at a distance r/sub c/ ahead of the crack tip, the criterion for directional stability is r/sub 0/ > r/sub c/. Experimental and theoretical values of r/sub 0/ verify that as r/sub 0/ becomes small, the crack's directional stability deteriorates.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.; California Univ., Berkeley (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6298697
- Report Number(s):
- UCRL-82308; CONF-790503-3
- Country of Publication:
- United States
- Language:
- English
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