Stressed state of a cylinder with external circular crack under dynamic torsion

We have proposed a combined analytical and experimental method for the determination of dynamic stress intensity factors in impact torsion tests of cylindrical specimens with an external circular crack. We have obtained simple analytical relations for finding dynamic stress intensity factors, which contain parameters determined experimentally. The results obtained with the use of these relations are in good agreement with those based on the finite element method. We have carried out an electron-fractographic analysis of the fracture surfaces of specimens and have described the characteristic mechanisms of fracture under high-rate torsion of cylindrical specimens. __________ Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 43, No. 2, pp. 55–64, March–April, 2007.