An invariant formula for the right stretch tensor rate is given by a differential method directly.

利用直接求微分的方法，给出了右伸长张量率的不变性表示公式。

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Finally, through the approximate analysis, the approximate representation on the rotation tensor and stretch tensor is proposed.

最后通过近似分析，给出了在小变形中等转动情况下转动张量和伸长张量的近似表示。

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According to the principle of the transverse stretch tensor of object and the optic lever arm magnifying, this article designed a case tester for Young's modulus.

根据物体纵向拉伸，弹性变量及光杠杆的放大原理，制作了箱式杨氏模量实验仪。

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