numero25

V. Veselý et alii, Frattura ed Integrità Strutturale, 25 (2013) 69-78; DOI: 10.3221/IGF-ESIS.25.11 72 framework of two-parameter fracture mechanics (investigation of the stress intensity factor K and the T -stress, or their normalized values B 1 and B 2 , respectively). Later, more terms of the Williams series was considered and coefficients of the first several ones (up to around 10) were determined, again either in their absolute values A n or expressed as the normalized shape functions g n . Figure 1 : Variants of boundary conditions of the WST geometry in the area of the load application (compare (a) , (b) vs. (c) , (d) ). (a) (b) (c) (d)