航空液压管路轴向挤压式接头组件连接强度的数值分析

Numerical analysis of connection strength of axial extrusion joint for aviation hydraulic pipeline

针对目前航空液压管接头无法满足高工作压力要求的问题,以Φ12 mm的钛合金轴向挤压式接头为研究对象,利用Abaqus平台建立了轴向挤压连接成形与拉脱试验过程的有限元模型,通过同参数条件下的拉脱试验验证了有限元模型的准确性。结果表明,有限元模型计算误差仅为3.4%,接头组件连接强度是由导管与管套凹槽的轴向对抗阻力和导管与管套径向接触力共同决定的。系统研究了管套材料力学性能、凹槽结构、摩擦因数对接头组件连接强度的影响规律,管套材料屈服强度越高,连接强度越强;管套凹槽宽度每增长0.2 mm,连接强度提高约2.4%;摩擦因数每增加0.01,接头连接强度平均提升18%左右。

In view of the problem that the current aviation hydraulic pipe joint cannot meet the requirements of high working pressure,taking theΦ12 mm titanium alloy axial extrusion joint as the research object,the finite element model of axial extrusion connection forming and pulling-out test process were established by Abaqus platform.The accuracy of the finite element model was verified by pulling-out test under the same parameter condition.The results show that the calculation error of the finite element model is only 3.4%,the connection strength of the joint is jointly determined by the antagonistic resistance between pipe and groove of sleeve in the axial direction and the radial contact force between pipe and sleeve.The influence of the mechanical properties,groove structure and friction factor on connection strength of joint was systematically studied.The higher the yield strength of sleeve material,the stronger the connection strength.For every 0.2 mm increase of groove width,the connection strength increases by about 2.4%;for every 0.01 increase of friction factor,the connection strength of the joint increases by 18%on average.