THE NEAR TIP STRESS AND STRAIN FIELDS IN CRACKED SINGLE CRYSTALS

【摘要】 <正> The numerical analyses of stationary mathematically sharp Mode Icrack in FCC and BCC crystals with elastic-ideally plastic(EIP)and fast hardeningsaturation(FHS)law are carried out in the present paper.From the calculated re-sults,it is shown that:for the cases of small strain,EIP crystal cracks,the featuresof concentrated deformation patterns and the stress state in near-crack tip deforma-tion fields are identical to the earlier analytical solutions,but along the angular sectorboundaries,there exist narrow complex stress zones.The overall characteristics of de-formation patterns for the cases of EIP and FHS are similar.The behaviours of cracktip opening can be characterized by crack-tip-opening-displacement(CTOD).For thecase of FHS,finite deformation BCC crystal crack,our calculations are qualitativelyin agreement with recent experimental observations.更多还原

【Abstract】 The numerical analyses of stationary mathematically sharp Mode I crack in FCC and BCC crystals with elastic-ideally plastic(EIP)and fast hardening saturation(FHS)law are carried out in the present paper.From the calculated re- sults,it is shown that:for the cases of small strain,EIP crystal cracks,the features of concentrated deformation patterns and the stress state in near-crack tip deforma- tion fields are identical to the earlier analytical solutions,but along the angular sector boundaries,there exist narrow complex stress zones.The overall characteristics of de- formation patterns for the cases of EIP and FHS are similar.The behaviours of crack tip opening can be characterized by crack-tip-opening-displacement(CTOD).For the case of FHS,finite deformation BCC crystal crack,our calculations are qualitatively in agreement with recent experimental observations.更多还原