摘要
火箭橇是在专用轨道上利用火箭发动机作动力推动火箭滑车高速前进以获取试验测试数据的动态试验装备.火箭橇滑块在高速重载服役条件下的磨损严重威胁着火箭橇的可靠运行和服役安全,更是制约火箭橇发展和应用的技术瓶颈之一.本文作者基于Archard磨损模型和弹塑性变形理论,利用有限元开展了0Cr18Ni9Ti-U71Mn火箭橇摩擦副在高速重载下磨损行为的数值模拟.0Cr18Ni9Ti为火箭橇滑块,U71Mn为火箭橇滑轨,在模拟速度为300、340和380 m/s以及载荷为2、3和4 kN,模拟了高速重载下滑块磨损特性的演变过程.结果表明:增加载荷或速度均出现了前端效应,致使前端区域更容易发生磨损.增加载荷不利于磨损阶段从初始磨损向稳定磨损的转变,而增加速度却能够起到促进作用.随着载荷的增加,滑块的磨损深度随平均接触压力的增大而显著上升;但随着速度的增加,平均接触压力呈现下降趋势,滑块磨损深度缓慢增大.高速重载条件下,通过控制载荷可以有效减少火箭橇滑块的磨损,延长滑块的服役寿命.
Rocket sled is one kind of dynamic test equipment that driven by a rocket engine on dedicated track at high forward speed for getting test data.It has been confirmed that the wear of slider received from high-speed and heavyload conditions seriously threatens the reliable operation and service safety of rocket sled during operation.This even becomes a technical bottleneck that restricts the developments and applications of rocket sled.Based on the Archard model of wear calculation and theory of elastic-plastic deformation,the wear dynamic evolution process of 0Cr18Ni9Ti-U71Mn rocket sled friction pair was conducted by finite element method,in which 0Cr18Ni9Ti was used as slider material and U71Mn was served as rocket track material.In this work,the evolution of the slider wear characteristics was simulated,and three sliding velocities(300,340 and 380 m/s)and three loads(2,3 and 4 kN)were selected.Firstly,the Archard wear program code was embedded in the finite element simulation software to realize the wear simulation.Secondly,high-speed and heavy-load were set in the boundary conditions.Therefore,considering the plastic deformation of 0Cr18Ni9Ti material under heavy-load,the bilinear isotropic hardening model of the material was involved in the analysis.Then,the established model was pre-simulated to determine the setting of other parameters such as maximum time step(MTS),wear duration,and appropriate meshing.Meanwhile the correlation between speed,load,and the slider wear behavior from the perspectives of the wear amount of the slider and contact pressure were further clarified.The data in the relevant literature were compared to verify the accuracy of the simulation.The results showed that both the load and speed demonstrated an effect on the wear amount of the slider.The slider would incline forward and downward under high-speed sliding.The maximum wear area was located in the front of the slider,which revealed an obvious front-end effect,and this would lead to more serious wear of the front of the slider tha
作者
严凯
王焕焕
林乃明
王振霞
王玮华
曾群锋
YAN Kai;WANG Huanhuan;LIN Naiming;WANG Zhenxia;WANG Weihua;ZENG Qunfeng(College of Material Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan 030024,China;Aviation Key Laboratory of Science and Technology on Life-support Technology,AVIC Aerospace Life-Support Industries,Ltd,Hubei Xiangyang 441003,China;School of Mechanical Engineering,Xi’an Jiaotong University,Shaanxi Xi’an 710049,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2023年第6期666-681,共16页
Tribology
基金
航空科学基金(20200029029001)
“两机”专项(j2019-IV-0004-0071)
陕西省自然科学基金(2022JM-251)资助。
关键词
火箭橇滑块
高速重载
Archard磨损模型
弹塑性变形
数值模拟
rocket sled slider
high-speed and heavy-load
Archard wear model
elastic-plastic deformation
numerical simulation
