caa a22 4500 465741304 CHVBK 20180323111809.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF01185956 doi (NATIONALLICENCE)springer-10.1007/BF01185956 The influence of crack size on the fracture behaviour of short cracks [Elektronische Daten] [G. Harlin, J. Willis] Crack size effects are investigated by applying local fracture criteria at a specific distance ahead of a crack tip, related to the material's microstructure. For sufficiently long cracks, the criteria are applied at points within the singularity-dominated region and then failure corresponds to the attainment of a critical intensity of the singularity but for shorter cracks this may not be the case and size effects may be anticipated. Comparisons of stress and strain fields around crack tips are made between cracked specimens and a "boundary layer” model which allows for a finite "T-stress” parallel to the line of the crack; these demonstrate that size effects can be characterized, for a useful range of crack sizes, in terms of the elasticT-term. The variation of the ductile-brittle transition temperature with crack size is studied on the basis of model calculations based on a power-law hardening material with temperature-dependent yield stress, coupled with two competing fracture criteria, chosen to model brittle or ductile crack extensions respectively. Generally, shorter cracks display lower transition temperatures and higher toughness. This potentially beneficial effect may, however, be nullified by stress triaxiality. Kluwer Academic Publishers, 1990 Harlin G. Rolls-Royce plc, P.O. Box 3, BS12 7QU, Filton, Bristol, UK aut Willis J. School of Mathematical Sciences, University of Bath, BA2 7AY, Bath, UK aut International Journal of Fracture Kluwer Academic Publishers 42/4(1990-04-01), 341-355 0376-9429 42:4<341 1990 42 10704 https://doi.org/10.1007/BF01185956 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01185956 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Harlin G. Rolls-Royce plc, P.O. Box 3, BS12 7QU, Filton, Bristol, UK aut NATIONALLICENCE 700 1- Willis J. School of Mathematical Sciences, University of Bath, BA2 7AY, Bath, UK aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 42/4(1990-04-01), 341-355 0376-9429 42:4<341 1990 42 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer