扭杆弹簧硬化强扭理论的研究

Study on hardening preseting theory of torsion bar spring

提出了扭杆弹簧在塑性硬化扭转时断面应力分布假设、硬化强扭的概念和硬化强扭扭矩、断面残余应力、残余变形角的计算方法。计算结果表明:扭杆弹簧强扭变形量较大时断面存在3种变形区,即弹性变形区、屈服变形区和硬化变形区;按硬化强扭理论可以使扭杆弹簧的承载能力提高80%以上,突破了屈服强扭认为承载能力最大只能提高33%的界限;强扭的应变角可以突破γ≈0.022的界限而达到γ≈0.034以上,计算结果与实际情况接近。

The stress disrtrbuting hypothesis of the broken surface, the hardening presetting concept and torque, the broken surface remain stress and the calculating method of the remain deformed angle to the torsion bar spring when it was turned under the plastic hardening condition were put forward. The calculating result shows that when the preset deformation of the torsion bar spring is bigger, three deformed areas appeares which are elastic deformed area, yield deformed area and hardening deformed area. According to the hardening preset theory, the loading capacity of the torsion bar spring can be improved over 80%, wicth breaks the 33% limited improvement to the loading capacity of the yield preset. The strain angle of preset can break the limit γ≈0. 022 and be up to over γ≈0. 034. The calculating result is close to the actual state.