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。
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。
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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