Effect of T-stress and loading rate on crack initiation in rate sensitive plastic materials

Effect of T-stress on fatigue crack closure in 3-D small-scale yielding

“…Under SSY conditions, the T -stress approximates the effects of in-plane geometry and loading (e.g. tension vs. bending) on plastic deformation around the crack tip and on the fracture process (Larsson and Carlsson, 1973;Rice, 1974;Betegon and Hancock, 1991;Du and Hancock, 1991;Wang and Parks, 1992;Xia and Shih, 1995;Ruggieri and Dodds, 1996;Jayadevan et al, 2002).…”

Three-dimensional effects on the dynamic fracture determination of Al 7075-T651 using TPB specimens

“…For this instant to be calculated, the time to fracture, t f , requires the application of a fracture criterion. Ritchie et al (1973) presented a local stress fracture criterion (RKR criterion) to explain crack propagation for a two-dimensional problem under static conditions, and was further applied under dynamic conditions by other authors (Wall, 2002;Jayadevan et al, 2002). This criterion holds that a crack propagates when the normal stress to the crack plane, r yy , at a characteristic distance from the tip of the crack, d c , reaches a critical value, r f (Fig.…”

The effect of T‐stress on plane strain dynamic crack growth in elastic–plastic materials

“…They proposed a simple crack initiation model based on dynamic stress intensity factor and T ‐stress. Some investigations have also been reported which examine the two‐parameter characterization of stationary elastic–plastic crack tip fields under dynamic loading 19–21 . It should be emphasised that these studies considered dynamic loading of a stationary crack, while the present work addresses the role of T ‐stress on elastic–plastic fields prevailing near a dynamically propagating crack tip.…”