摘要
为了研究高温基线密封中的编织弹簧的回弹特性,参照Pierce线圈模型对编织弹簧管进行参数化建模。采用有限元软件对编织弹簧管进行静力学仿真,对比有限元计算结果与实验数据,接触面摩擦因数为0.1时仿真结果与实验结果吻合较好。弹簧刚度对线径十分敏感,回弹力与线径呈现非线性高次关系。增加编织线股数,弹簧刚度会成倍增加。温度在低于600℃时对弹簧刚度的影响较小,在高于600℃后,弹簧刚度随着温度升高快速下降。通过S-N曲线计算编织弹簧管在650℃时的最低疲劳寿命高于密封设计要求。研究结果表明,在编织弹簧管的设计要求的前提下,环密度为0.05、线径为0.32mm、双线编织的编织弹簧管具有较好的性能。。
In order to study the springback characteristics of braided spring in high temperature baseline seal,a parametric model of braided spring tube was established by Pierce coil model. The static simulation of braided spring tube was carried out by using finite element software. Compared with the experimental data,the simulation results are in good agreement with the experimental results when the friction coefficient of the contact surface is 0. 1. Spring stiffness is very sensitive to line diameter,and the relationship between spring resilience and line diameter is non- linear and high-order. Increasing the number of strands of braided yarn will multiply the spring stiffness. The influence of temperature on spring stiffness is small when it is lower than 600 ℃. When it is higher than 600 ℃, spring stiffness decreases rapidly with the increase of temperature. The minimum fatigue life of braided spring tube calculated by S-N curve is higher than that of sealing design at 650 ℃. According to the design requirement of baseline seal,it is recommended to use the parameters of ring density LD=0.05,line diameter 0.32 mm and double- wire braiding to make braided spring tube.
作者
巴全坤
王维民
姜鑫
张登鹏
BA Quankun;WANG Weimin;JIANG Xing;ZHANG Dengpeng(Beijing Key Laboratory of Health Monitoring and Self-Healing of High-end Machinery and equipment,Beijing University of Chemical Technology,Beijing 100029)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2019年第3期15-20,共6页
Aerospace Materials & Technology
基金
国家自然科学基金面上项目(51775030)
