Experimental investigation of crack path directional stability

Conference · Sun Apr 01 04:00:00 EST 1979

OSTI ID:6298697

Streit, R; Finnie, I

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

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
CRACKS
ELEMENTS
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
METALS
STRESSES