High Rate Deformation in the Field of a Crack

The effects of strain rate, temperature and constraint on the large scale yielding fracture initiation behaviour of a mining steel

“…Equation (8) assumes that elastic strains are negligible. From the HRR solution [11,12], for the plane strain case, the plastic strain at the critical microstructural distance is ten times the elastic strain whereas at half this distance the plastic strain is thirty times larger than the elastic component.…”

“…The strain rate in the vicinity of the crack changes rnarkehi with distance from the crack tip. However an average crack tip strain rate can be related to the uniaxial strain rate by [12]:-& = 0.00024 1 J (10) Hence equations (10) and ( 6) can be used to quantify the average dynamic values of yield stress to be used in (9).…”