stress dislocation

Based on a dislocation dynamic model, a dependence between the second invariants of the inelastic deformation rate and those of stress deviator is proposed and thus a rate-dependent visco/ plastic constitutive equation is built.

基于一种位错动力学模型建立了非弹性应变率偏张量第二不变量与应力偏张量第二不变量之间的函数关系，由此给出一种粘塑性本构方程。

During in site extension in TEM without the liquid metal, only when dislocation emission and motion induced by thermal activity and applied stress reached a certain critical condition, microcrack would nucleate but not blunt into a void.

α-Ti在TEM中原位拉伸时，只有当热激活或外应力促进的位错发射和运动达到临界条件时，微裂纹才形核，并很快钝化成空洞而导致韧断。

The flow stress was evaluated the average dislocation density of the matrix and all the R-grains.

流变应力的大小可由基体与再结晶晶粒位错密度的平均值计算.

The results show that dezincification corrosion resistance of cold-drawing Bi-brass is worse than that of hot-rolled Bi-brass and as-cast Bi-brass as a results of β phase distributed along cold-working direction and the increase of dislocation density and residual stress.

结果表明，冷拔态的铋黄铜，由于β相沿着冷加工方向分布，同时位错密度和残余应力的增加，导致了其耐脱Zn腐蚀性能比热轧态的黄铜和铸造态的黄铜差。

The results reflect that the dislocation motion have two branches of high velocity and low velocity with the change of the solute concentration and the volume dilation; the dislocation critical de-pinning stress rises with the increment of the solute concentration and the volume dilation.

结果表明，随着溶质原子浓度和体积膨胀的改变，位错的运动速度存在高速和低速两个分支；位错的临界脱钉应力值随着溶质原子浓度和体积膨胀的增加而增加。

The effect of cyclic loading makes the plastic zone hardening ( or softening), which raises the stress level in Dislocation-Free Zone ( DFZ) and the value of-integral, and may lead to fracture.

循环载荷使得裂纹尖端的塑性区循环硬化/软化，这使无位错区的应力和裂纹尖端区域的J积分的值升高，从而有可能导致开裂。