一般情况下，模型栅格的变形是轴向应变和切向应变的组合。
In general, the deformation of the model grille is a combination of axial and shear strains.
通过大量管材弯曲试验，分析了沿弯曲线的切向和管壁厚方向的应力应变状态，给出弯管内、外侧管壁厚变化量和切向应变的近似计算公式。
Based on lots of tube bending experiments, the stress-strain state along the tangential direction of bending line and the direction of the wall thickness is analyzed.
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