叶片-轮盘榫联结构的接触分析

CONTACT ANALYSIS OF DOVETAIL ATTACHMENT IN BLADED-DISC SYSTEM

叶片与轮盘之间的榫联结构存在接触和摩擦组合运动,在较高的热-机械载荷作用下容易发生微动磨损并导致疲劳破坏.本文采用有限元法对叶片-轮盘榫联结构进行接触分析,计算不同摩擦系数和不同转速情况下的叶片榫头和轮盘榫槽之间的接触压力、接触滑动距离.结果表明,摩擦系数增大,榫联结构接触面上的接触压力和滑动距离减小;转速增加,则接触压力和滑动距离增大.

Dovetail attachment is a typical structure of turbomachine connecting blades and disk （root-blade and slot-disk contact with each other）. Fretting wear and surface fatigue fracture tend to occur under higher thermal and vibration loads in dovetail attachment interface, where blade usually happens to fatal failure. FEA method was applied to solve the complexity of the contact interface stress of dovetail attachment. The contact pressure and contact slide distance of dovetail attachment were calculated under different friction coefficient and different rota- tional speed. The calculation shows that contact pressure and contact slide distance reduce as friction coefficient increases, and the contact pressure and contact slide distance enlarge as rotational speed increases.