燕尾形榫联接抗微动损伤修形研究

为了预防和减轻榫联接中微动磨损,提高其抗微动疲劳能力,主要措施有三:第一,在结构设计中,使联接的方式有利于减轻磨损或尽可能地消除接合面;第二,对接触表面作适当的处理,改善表面质量,如表面涂层、离子注入和表面冷加工等;第三,在接触面上加填充物。本文提出用修形方法改变榫联接接合面的形状,改善接触处的有关力学参数,达到减轻联接的微动磨损和提高抗微动疲劳能力的目的。 

MODIFICATION OF SHAPE OF DOVETAIL JOINTS FOR ANTI-FRETTING DAMAGE

The fretting damage of the dovetail joints between blades and disks in turbojet engines has significant effect on fatigue life of the joints.In order to improve the resistibility to of dovetail joints fretting damage,an effective method provided,which palliates the fretting wear of the joint.By modifying the shape of the local interface to adjust the distribution of the mechanical parameters.The numerical analysis of the joints with the Boundary Element Method indicates that for the modified joints the peak reaction on the interface drops greatly but the peak stress does not rise at both the contacting and non contacting interface in elastic bodies.Comparative experiments have been carried out.The results show that the fretting wear of the modified dovetail joints is palliated,especially at the root of contact surface.The fatigure life of the appropriately modified dovetail joints increases twice.