加荷速率是材料试验过程中的一个重要控制参量。
The loaded speed rate is an important control parameter in the material testing process.
采用夹头分离速率控制方式对有屈服现象和无屈服现象的试样进行拉伸试验，探讨了试验过程中试样应变速率和应力速率的变化情况。
The change of strain rate and stress rate of samples with and without yielding phenomenon was studied during the tensile test under the control of grip separate rate.
与各种位错机制作了比较，认为控制变形速率的过程很可能是克服派一纳力。
After comparing with various dislocation mechanisms, it is shown that the deformation-controlling process is probably the overcoming of the Peierls-Nabarro force.
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