torsional strain

In this paper,the strain of twist compression deformation is analyzed and the formulae are derived in detail,furthermore,some numerical results are given.

本文分析了压扭变形时变形体内应变情况，并给出求解真应变的公式及部分计算结果。

But in the operation of the curved box-girder, bending and torsion deformation has also been quite pronounced.

但在运营中遇到的弯箱梁弯扭变形问题也比较突出。

The paper first presents the development of skew surface CAD and the conception of NURBS,and proposes a reverse algorithm for curves and surfaces to construct Lamina skew surfaces by deriving the original 2-D skew surface data to 3-D data,improving the modelling methods and effectively enhances the design precision of such surfaces in practical production.

本文首先介绍了扭变曲面CAD在国内外的发展情况和NURBS方法的概念,通过推导曲面初始二维数据向三维数据的转换关系,提出一种将NURBS曲线曲面反求算法用于叶片曲面的构造,完成叶片的计算机建模方法,有效地提高了此类曲面在实际生产中的设计精度。