Vol.4, No2, 2004, pp. 91-100
UDC 62-988:539.421:519.6

The original paper (in Serbian) appears in monograph “Service Cracks in Pressure Vessels and Storage Tanks,” edited by S. Sedmak and A. Sedmak, jointly published by the Faculty of Technology and Metallurgy (Belgrade), European Centre for Peace and Development (Belgrade), and GOŠA Institute (Smederevska Palanka), pp. 211-227, 1994. The monograph contains lectures from the Sixth International Fracture Mechanics Summer School (IFMASS 6) held in Vrdnik, 1991.