应变速率对应力应变曲线的影响更多体现在塑性变形，应变速率对弹性应变能随应变的变化影响较小，而对位错的产生和移动有较大的影响。随着应变速率的上升，抗拉强度明显增加，而且在应变速率较低时增加更为显著，且断裂后需要在更大的应变下应力才能恢复到稳定值。

The influence of strain rate on the stress-strain curve is mainly reflected in the plastic deformation. Strain rate has little influence on the change of elastic strain energy with strain, but has great influence on the generation and movement of dislocation. With the increase of strain rate, the tensile strength increases obviously, and the increase is more significant when the strain rate is low, and the stress can be restored to the stable value under larger strain after fracture.