And the effects under the control laws of negative strain rate feedback and positive strain feedback are compared.

比较了应变率负反馈和应变正反馈控制律的控制效果。

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Uniaxial prestrain will obviously improve the forming limit on positive strain ratio zone, while it has little effect on negative strain ratio zone.

单拉预应变路径将显著提高正应变比区的成形极限，而对负应变比区的成形极限影响不大。

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Equiaxial prestrain will obviously decrease the forming limit on positive strain ratio zone, while it slightly improves the forming limit on negative strain ratio zone.

等双拉预应变将明显降低正应变比区的成形极限，对负应变比区的成形极限有所提高。

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With the increment of impact velocity, the new material appears positive strain rate sensitivity, but when the increment reaches a certain degree, the material shows negative strain rate sensitivity.

随着冲击速度的提高，材料具有应变率正敏感性，但到一定程度材料反而显示出应变率负敏感性。

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With the increment of impact velocity, the new material appears positive strain rate sensitivity, but when the increment reaches a certain degree, the material shows negative strain rate sensitivity.

随着冲击速度的提高，材料具有应变率正敏感性，但到一定程度材料反而显示出应变率负敏感性。

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