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针对某厂扭力杆缓冲装置运行时出现的问题,运用有限元软件建立其整体装配非线性有限元模型,充分考虑螺栓预紧力、零件间过盈配合及接触非线性,分析扭力杆缓冲装置在最大倾动力矩与事故状态下的应力分布及强度,提出螺栓联接修改建议。研究结果表明:螺栓根部出现严重的应力集中现象,这与螺栓过早损坏是一致的;扭力杆在最大倾动力矩作用下安全裕度较大;在事故状态下最大应力出现在扭力杆键槽附近,其值接近材料疲劳强度极限。研究结果为螺栓联结的改进提供了依据,也为扭力杆的设计制造与检修提供理论依据。
Aiming at the problems in the operation of a torsion bar cushioning device in a factory, the nonlinear finite element model of the whole assembly was established by using the finite element software. The bolt pre-tightening force, interference fit between parts and contact nonlinearity were fully considered. The maximum tilting moment and the stress distribution under the state of accident and strength, put forward the suggestions of bolt connection modification. The results show that there is a serious stress concentration in the root of the bolt, which is consistent with the premature failure of the bolt. The safety margin of the torsion bar under the maximum tilting moment is large. The maximum stress occurs near the torsion bar keyway in the accident state , Its value close to the material fatigue strength limit. The results provide the basis for the improvement of the bolt connection, and provide the theoretical basis for the design, manufacture and maintenance of the torsion bar.