Issue 49

L.. Malíková et alii, Frattura ed Integrità Strutturale, 49 (2019) 65-73; DOI: 10.3221/IGF-ESIS.49.07

a) MTS,  = a / R = 0.5,  = 10°

b) MTS,  = a / R = 0.5,  = 50°

c) SED,  = a / R = 0.5,  = 10° d) SED,  = a / R = 0.5,  = 50° Figure 6 : Crack deflection angles  obtained on the SCB specimens for larger cracks ( a / R = 0.5) via multi-parameter MTS and SED criterion applied at critical distances of 0.1, 0.5 and 1.0 mm for crack inclination angles 10° and 50° and considering up to 10 initial terms of Williams’s expansion.

A CKNOWLEDGEMENT

inancial support from the Czech Science Foundation (project No. 18-12289Y) and from the Faculty of Civil Engineering, Brno University of Technology (project No. FAST-S-19-5896) is gratefully acknowledged. [1] Berto, F., Lazzarin, P. (2010). On higher order terms in the crack tip stress field, Int. J. Fract., 161, pp. 221–226. DOI: 10.1007/s10704-010-9443-3. [2] Du, Z.Z., Hancock, J.W. (1991). The effect of non-singular stresses on crack tip constraint, J. Mech. Phys. Solids, 39, pp. 555–567. DOI: 10.1016/0022-5096(91)90041-L. [3] Karihaloo, B.L. (1999). Size effect in shallow and deep notched quasi-brittle structures, Int. J. Fract., 95, pp. 379–390. DOI: 10.1023/A:1018633208621. [4] Williams, M.L. (1957). On the stress distribution at the base of a stationary crack, J. Appl. Mech. (ASME), 24, pp. 109– 114. [5] Malíková, L. (2015). Multi-parameter fracture criteria for estimation of crack propagation direction applied to a mixed- mode geometry, Engng. Fract. Mech., 143, pp. 32–46. DOI: 10.1016/j.engfracmech.2015.06.029. F R EFERENCES

72