扭杆刚度衰减问题研究的损伤力学方法

Twisting Bar Stiffness Attenuation analysis based on Damage Theory

研究目的在于预估扭杆弹簧在给定扭角下储存给定年限后的剩余扭矩值。由于给定时间一般都很长,这里引用损伤力学原理进行此项研究。首先,在固定扭角(等于工作贮存扭角)的情况下进行扭转实验,得到扭矩与时间的实验曲线。然后,利用这些实验结果,以损伤力学作为理论基础,确定损伤力学中损伤演化方程的材料常数,并据此建立以扭角与材料常数为参量的扭矩与时间函数关系,绘制了相应的扭矩与时间的理论曲线。最后,预估扭杆弹簧在给定扭角下储存给定年限后的剩余扭矩值。

To predict the residual torque of a twisted bar after reserving for certain years, the damage theory is adopted to analyze the long period effect. The twisting test is carried out at a fixed twisting angle equal to twisting one in reserved state, and the experimental curve between torque and time is obtained. Then the material constants in the damage evolution equation are determined with the experimental data, and the function between torque and time is expressed with the twisting angle and material constants, the corresponding curve is plotted to predict the residual torque within a required period.