真实应力是指拉伸（或压缩）试验时，变形力与当时实际截面积（而不是初始截面积）之比。
计算时，板料的真实应力-应变曲线拟合为幂强化函数型。
In calculating, power hardening function is used as the true stress - strain curve of materials.
金属材料在不同应变率下的真实应力应变曲线是汽车碰撞模拟的一个关键。
By scientific computing with the constitutive equation, the plate′s stress-strain curves at different strain rate are obtained.
通过实验得到真实应力的关系式及真实应变关系式，进而得到真实应力-应变曲线。
Through the experiment, the relation formula of real stress, real strain and the curve of stress and strain are achieved.
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