冲击载荷下不同有效长度扭矩轴的扭转特性

为研究扭矩轴的有效长度和载荷对其扭转特性的影响,应用ANSYS Workbench有限元软件,当扭矩轴的卸荷槽尺寸不变、有效长度967~267 mm和载荷瞬态冲击时间0.005~0.100 s时,分析扭矩轴扭转过程的静力学和瞬态动力学特性。结果表明:在不同瞬态冲击时间下,扭矩轴的切应力变化与弹塑性变形过程存在明显差异;扭矩轴有效长度越小,切应力越大;当瞬态冲击时间为0.005 s时,切应力的平均变化率为5.6 MPa/dm,瞬态冲击时间越短,切应力越大且梯度变化越大,呈现非线性特征;当有效长度为267 mm时,0.005 s切应力最大变化大于27 MPa。该研究可为扭矩轴的结构设计提供参考依据。

Torsion characteristics of torque shaft with different effective lengths under loading impact

This paper is an effort to delve into the effect of effective length and loading on torsion characteristics on the torque shaft. The research uses ANSYS Workbench finite element software to ana- lyze the characteristics of the torque shaft in static theory and transient dynamics characteristics during the torsion process, as in the case where the size of unloading groove of torque shaft remains unchanged ; the effective length stays in the range of 967 -267 mm; and the transient time under loading impact is any- where from 0. 005 s to 0. 100 s. The result shows a significant difference between the changing process of the shear stress itself and the process of elastic-plastic deformation due to different transient impact time. The shorter effective length of torque shaft means a bigger shear stress. The transient impact time of 0. 005 s triggers the average changing rate in shear stress of 5.6 MPa/dm, suggesting that a shorter tran- sient impact time gives a bigger shear stress and consequently a greater change in gradient, producing nonlinearity characteristics; the effective length of 267 mm is associated with the biggest changing rate of shear stress greater than 27 MPa; the shorter length of torque shaft is linked to a positive relationship be- tween the shear stress and the time of impact. The study could provide some reference points for the phys- ical designing of the torque shaft.