压缩弹簧经塑性变形强化后,可以增大其许用载荷或减小其尺寸。但是,按已知的利用τ—γ剪切图的方法来计算这种弹簧的变形是很复杂的,不经长期的试验研究不可能精确地设计出这种弹簧。然而,有许多作者的研究都谈到了,一定组别的弹簧材料的机械性能是稳定不变的,其剪切图的塑性范围也是相似的。既然如此,那么看来τ—γ图在塑性范围的相似就应当对应“扭矩 M 与转角 Q“或是”力 P 与弹簧的变形λ的相似关系。的确,M—Q 与 Compression spring plastic deformation strengthened, you can increase its allowable load or reduce its size. However, it is complicated to calculate the deformation of such springs according to the known method of using τ-γ shear diagrams, which can not be accurately designed without long-term experimental studies. However, many authors have mentioned that the mechanical properties of certain groups of spring materials are stable and the plastic range of their shear diagrams is similar. In that case, then it appears that the similarity in the plastic range for the τ-γ graph should correspond to the similarity between “torque M and angle Q” or “force P and spring deformation λ.” Indeed, M-Q and