caa a22 4500 469124172 CHVBK 20180323133146.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF00034668 doi (NATIONALLICENCE)springer-10.1007/BF00034668 Melin Solveig Division of Solid Mechanics, Lund Institute of Technology, Box 118, S-221 00, Lund, Sweden aut Directional stability of an originally straight crack [Elektronische Daten] [Solveig Melin] 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 in-plane 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-π/4 of the other in-plane stress. Kluwer Academic Publishers, 1992 International Journal of Fracture Kluwer Academic Publishers 53/2(1992-01-01), 121-128 0376-9429 53:2<121 1992 53 10704 https://doi.org/10.1007/BF00034668 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00034668 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Melin Solveig Division of Solid Mechanics, Lund Institute of Technology, Box 118, S-221 00, Lund, Sweden aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 53/2(1992-01-01), 121-128 0376-9429 53:2<121 1992 53 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer