On the basis of the concept of the vertical crooked arm in material mechanics, a quantitave analysis of the distribution and evolution of horizontal shear stress in vertical folding is discussed.
根据材料力学纵弯杆概念，从定量角度分析了横向剪应力在纵弯褶曲中的分布和演化。
2
The door is open run in peace folding doors around the hinge rotation, the maximum stress component is the hinge, bearing friction hinge is very small, the noise is small.
折叠门和平开门运行中门扇是绕铰链旋转的，受力最大的部件是铰链，铰链的轴承摩擦阻力很小，噪音也很小。
3
The mechanics model is set up for the section caused folding surface and the new algorithm of shearing stress for the corresponding metal surface are produced, as being the one of the design rules.