caa a22 4500 465741312 CHVBK 20180323111809.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF01185957 doi (NATIONALLICENCE)springer-10.1007/BF01185957 McClintock Frank Department of Mechanical Engineering, Massachusetts Institute of Technology, 02139, Cambridge, Massachusetts, USA aut Reduced crack growth ductility due to asymmetric configurations [Elektronische Daten] [Frank McClintock] Fully plastic structures are desirable to help detect impending failure. For stability, the displacement per unit drop in load due to any crack growth must be less than the compliance of the surrounding structure. The corresponding crack growth ductility is less with asymmetric configurations, than with the symmetric ones usually studied. Examples are given of face-grooved plates with unequal flank angles, staggered cracks, and single cracks near welds in joints under tension or bending. Further examples are the tendency of cracks on a microscopic scale to become rough, to zig-zag, or even to spiral (in round bars). The maximum triaxiality can occur on a single slip line between staggered cracks from opposing faces of a plate, according to a slip line analysis. Except at the lowest triaxiality, 1018CF steel with a 3 mm ligament became unstable even when the compliances of the surroundings totalled only 6 × 10−6 mm/N. For higher triaxialities the limit load was not reached and the ensuing unstable fractures usually turned to cleavage. In plates, the slow,stahle, plastic extension of slant-mode through-cracks sometimes abruptly changed to cleavage fracture, even at 10°Cabove both the 0.51 mm lateral expansion and Charpy 34.1 J (25 ft-Ib) transition temperatures, either sufficient to meet the ASME Code. In structures, this means that fragmentationcan intervene even during slow, "low-triaxiality”, stable crack growth in material meeting Code requirements. Kluwer Academic Publishers, 1990 International Journal of Fracture Kluwer Academic Publishers 42/4(1990-04-01), 357-370 0376-9429 42:4<357 1990 42 10704 https://doi.org/10.1007/BF01185957 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01185957 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- McClintock Frank Department of Mechanical Engineering, Massachusetts Institute of Technology, 02139, Cambridge, Massachusetts, USA aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 42/4(1990-04-01), 357-370 0376-9429 42:4<357 1990 42 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer