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在《机械强度》1983年第4期中,我们曾对滑移线场理论中如何确定α线作了介绍。文中给出了一个根据边界单元体上剪应力作用方向来确定α线的方法。当单元体两侧剪应力组成顺时针方向力偶时,则该剪应力的方向即为α族滑移线的方向。文中给出确定θ角的公式为: θ=φ±1/2cos~(-1)τ_α/k±mπ (1) 便是,该文中未对公式的使用方法进行讨论。而且,在举例说明的过程中有误。为了弄清这个问题,有必要对这一问题作进一步的讨论。
In “Mechanical Strength”, No. 4, 1983, we introduced how to determine the α-line in the slip-line theory. In this paper, a method of determining α-line based on the direction of shear stress acting on the boundary element body is given. When the shear stress on both sides of the unit is composed of a clockwise force, the direction of the shear stress is the direction of the α-group slip line. The formula for determining the angle θ is given as follows: θ = φ ± 1/2 cos -1 (τ - α / k ± mπ) (1) That is, the use of formulas is not discussed in this paper. And, in the process of illustration is wrong. In order to understand this issue, it is necessary to further discuss this issue.