Directional stability of an originally straight crack
(1992) In International Journal of Fracture 53(2). p.121128 Abstract
 The directional stability of an originally straight crack under symmetric remote loading is studied after introduction of an infinitesimal disturbance at one or both tips of the crack. The crack is assumed to grow slowly under vanishing mode II stress intensity factor. Directional stability is defined to prevail if the angle formed by the straight line between the crack tips and the original crack direction eventually decreases during crack growth. This is shown to be the case if, and only if, the principal stress perpendicular to the original crack is the largest of the two inplane stresses.
Another candidate for definition of directional stability is also discussed, even though it appears less logical, since it concentrates on... (More)  The directional stability of an originally straight crack under symmetric remote loading is studied after introduction of an infinitesimal disturbance at one or both tips of the crack. The crack is assumed to grow slowly under vanishing mode II stress intensity factor. Directional stability is defined to prevail if the angle formed by the straight line between the crack tips and the original crack direction eventually decreases during crack growth. This is shown to be the case if, and only if, the principal stress perpendicular to the original crack is the largest of the two inplane stresses.
Another candidate for definition of directional stability is also discussed, even though it appears less logical, since it concentrates on the position of the crack tips rather than on the main direction of the crack. It assumes that directional stability prevails if the crack tips eventually move closer toward the line along the original crack. This definition leads to directional instability when the principal stress in the original crack direction is larger than the fraction 1/4 of the other inplane stress. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1515274
 author
 Melin, Solveig ^{LU}
 organization
 publishing date
 1992
 type
 Contribution to journal
 publication status
 published
 subject
 in
 International Journal of Fracture
 volume
 53
 issue
 2
 pages
 121  128
 publisher
 Springer
 external identifiers

 scopus:12344326360
 ISSN
 03769429
 DOI
 10.1007/BF00034668
 language
 English
 LU publication?
 yes
 id
 62264481229e43a9955050ed03ef08bc (old id 1515274)
 date added to LUP
 20160404 08:04:03
 date last changed
 20210103 11:29:16
@article{62264481229e43a9955050ed03ef08bc, abstract = {{The directional stability of an originally straight crack under symmetric remote loading is studied after introduction of an infinitesimal disturbance at one or both tips of the crack. The crack is assumed to grow slowly under vanishing mode II stress intensity factor. Directional stability is defined to prevail if the angle formed by the straight line between the crack tips and the original crack direction eventually decreases during crack growth. This is shown to be the case if, and only if, the principal stress perpendicular to the original crack is the largest of the two inplane stresses.<br/><br> Another candidate for definition of directional stability is also discussed, even though it appears less logical, since it concentrates on the position of the crack tips rather than on the main direction of the crack. It assumes that directional stability prevails if the crack tips eventually move closer toward the line along the original crack. This definition leads to directional instability when the principal stress in the original crack direction is larger than the fraction 1/4 of the other inplane stress.}}, author = {{Melin, Solveig}}, issn = {{03769429}}, language = {{eng}}, number = {{2}}, pages = {{121128}}, publisher = {{Springer}}, series = {{International Journal of Fracture}}, title = {{Directional stability of an originally straight crack}}, url = {{http://dx.doi.org/10.1007/BF00034668}}, doi = {{10.1007/BF00034668}}, volume = {{53}}, year = {{1992}}, }