摘要
结合厚壁缸筒等剪应力钢丝缠绕理论,给出了厚壁缸筒等剪应力缠绕的有限元模拟方法。由于有限元模拟和实际缠绕施工中,对钢丝层按多个等厚度的台阶进行简化,使得缠绕后各钢丝台阶中的剪应力比理论值略低,实际的预紧效果略低于理论设计。根据各钢丝台阶剪应力有限元解和理论解的差值,提出了误差率的概念,并给出了误差补偿措施,经过误差补偿后的有限元模型,有限元解和理论解一致。讨论了预紧系数的意义和取值范围,并结合50 MN预应力钢丝缠绕液压缸的设计,研究了在最小预紧系数和极限预紧系数的范围内,初始缠绕应力随预紧系数的变化规律,以及预紧工况和合成工况下,芯筒内外壁径向、切向应力的变化规律。
For the thick-walled cylinder,combining with the theory of equal-shear stress steel wire winding,the finite element simulation method of equal-shear stress steel wire winding was presented.Because the steel wire layers were simplified into the multiple equal thickness steps in finite element simulation and actual winding construction,the shear stress in each steel wire step after winding was slightly lower than the theoretical value,and the actual pretension effect was slightly lower than that of the theoretical design.According to the difference value of shear stress for each steel wire step between finite element solution and theoretical solution,the concept of error rate was put forward,and the error compensation measures were given.After error compensation,the finite element solution consisted with the theoretical solution.Furthermore,the significance and value range of pretension coefficient were discussed,and combined with the design of 50 MN pretension steel wire winding hydraulic cylinder,the variation law of initial winding stress with pretension coefficient in the range of minimum and limit pretension coefficients and the variation law of radial and tangential stresses on the inner and outer walls of core cylinder under the pretension and synthetic conditions were studied.
作者
杨晓俊
夏卫明
Yang Xiaojun;Xia Weiming(Department of Electrical and Mechanical Engineering,Changzhou Liu Guojun Vocational Technology College,Changzhou 213025,China;Jiangsu Xuzhou Forging Machine Group Co.,Ltd.,Xuzhou 221100,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2020年第9期201-211,共11页
Forging & Stamping Technology
关键词
等剪应力
预应力
预紧系数
钢丝缠绕
缸筒
切向应力
equal shear stress
prestress
pretension coefficient
steel wire winding
cylinder
tangential stress
