The Elastic-viscoplastic Field At The Mixed-mode Steadily Propagating Crack-Tip Under Compression And Shear

Under the assumption that the artifical viscosity cofficient is in inverse proportion to power law of the plastic strain rate.The friction touch effection beween viscosity and crack-tip surface be considerde,the asymptotic solution is established for elastic-viscoplastic field at the mixed-mode propagating crack-tip under comprission and shear.The numerical solution to crack-tip without stress and stain gap is got. The variation of numerical solution are discussed for the mixed-mode under compression and shear according to each parameter.It is shown in numerical results and analysis that for the mixed-mode crack-tip field under compressing and shear is whole plastic without elatic unloaded section,viscosity effection is an important factor when propagating crack-tip field is studied, whether the mixed-mode crack trend to mode I or to mode II,the hydro-statil stresses are added according to the increasing on frictional coefficient. The crack-tip propagating velocity is prevented due to the frictoon on crack face,the tenacity on crack-tip freld become more higher with the more strorger on friction.Keywords: mixed-mode crack-tip under compression and shear; steadily propagating; viscosity effectionelastic-viscoplastic materials