EFFECT OF DISLOCATION SELF-INTERACTION ON OROWAN STRESS
EFFECT OF DISLOCATION SELF-INTERACTION ON OROWAN STRESS
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DOI：
10.1080/14786437308227997
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发表时间：
1973-01-01
影响因子：
1.6
通讯作者：
SCATTERGOOD, RO
中科院分区：
文献类型：
--
作者：
BACON, DJ;KOCKS, UF;SCATTERGOOD, RO
对于共线、不可穿透的圆形障碍物，确定了位错自作用对Orowan应力的影响。去掉了线张力近似，用基于曲率调整的算法求解了控制静力平衡的积分-微分方程组。当考虑相互作用时，Orowan应力变化，其中是障碍物大小和间距的调和平均值。此外，Orowan应力下的弓形位错构型受到相互作用的强烈影响：随着相互作用强度的增加，即随着障碍物尺寸与间距之比的减小，弓形和扫掠面积被抑制。通过将不可穿透的障碍视为可穿透的，相互作用的基本特征可以被合并到线张力框架中。在此线张力模拟的基础上，推导出了随机分布的不可穿透障碍物的流动应力的近似形式。
The effect of dislocation self-interaction on the Orowan stress was determined for collinear, impenetrable circular obstacles. The line tension approximation was dropped and an appropriate integro-differential equation governing static equilibrium was solved by an algorithm based on curvature adjustments. When the interactions are taken into account, the Orowan stress varies as In where is the harmonic mean of the obstacle size and spacing. In addition, the configuration of a bowing dislocation at the Orowan stress is strongly influenced by the interactions: as the interactions increase in strength, i.e. as the ratio of obstacle size to spacing decreases, the bow-out and area swept are suppressed. The essential features of the interaction can be incorporated into a line tension framework by treating the impenetrable obstacles as if they were penetrable. Based on this line tension analogue, an approximate form for the flow stress of a random distribution of impenetrable obstacles was developed.