ON THE INTERACTION OF MATERIAL HETEROGENEITY AND GEOMETRIC DISCONTINUITY IN SERRATED PLASTIC FLOWS
Some new experimental results are presented on the evolution of jerky plastic flow and associated localized plastic strain fields in Al-Mg sheet metals under quasi-static loading conditions.Effects of plasticity-induced material heterogeneity on the nucleation and growth of deformation bands over a nominally homogenous macroscopic stress field were first characterized using the standard uniaxial tension coupon geometry.Subsequently,test coupons with U- and V-shaped notches were used to characterize the notch-tip deformation field? subjected to a heterogeneous macroscopic stress field due to geometric discontinuity of notches.Experiments were carried out using both hard and soft test machines and limitations and uncertainties in the experimental measurements were critically examined.These experimental observations motivated a possible new modeling approach towards plausible explanations of the observed serrated plastic flow phenomena.
dynamic strain aging Portevin-Le Chatelier effect digital image correlation localized deformation band ductile fracture
W.Tong Y.Xuan H.Yao
Department of Mechanical Engineering,Southern Methodist University,Dallas,Texas,USA
国际会议
The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)
上海
英文
178-185
2011-05-22（万方平台首次上网日期，不代表论文的发表时间）