于是，在采用了线性形状函数来表达的位移分量以后，应力分量对运动方程的贡献必恒等于零。

Thus, if we use such form functions to represent the displacement components, the effect of internal stresses to the equations of motion vanishes identically.

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利用一系列适当形状的元素将计算区域离散，在元素内采用线性插值函数。

The computational domain is discretized by a series of elements with adaptable shape, linear inter-potation function is used in each element.

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本方法采用线性函数作为横截面翘曲位移的插值函数，适用于任意横截面形状和任意边界条件的薄壁杆件。

A linear function is used to express the warping displacements along the cross section of the thin-walled member.

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