自行走剪叉式高空作业平台剪叉臂的疲劳寿命分析

The Fatigue Life Analysis for the Shear Fork Arm of Self-propelled Scissors Aerial Work Platform

运用ANSYS/Workbench平台建立自行走剪叉式高空作业平台剪叉臂的有限元模型,对剪叉臂进行静力学分析,用名义应力法估算剪叉臂的疲劳寿命。结论:剪叉臂在起升初始位置和起升最高位置两种极限位置时,起升初始位置时所受应力最大,最大应力发生区域在剪叉式伸展结构最下层靠近升降液压缸支腿的铰接孔处,说明升降液压缸的驱动力对剪叉臂强度影响较大,且起升初始位置时升降液压缸的驱动力比起升过程中其它位置时要大。剪叉臂的应力集中和最大疲劳损伤均出现在起升初始位置时剪叉臂相同的铰接孔处,说明应力集中对剪叉臂的疲劳寿命影响较大,同时也间接说明升降液压缸的驱动力对剪叉臂的疲劳寿命影响较大。

This article is focused on establishing the finite element model of self-propelled scissors aerial work platform based on ANSYS / Workbench,and carrying out the the static analysis of shear fork arm and estimating the fatigue life of the shear fork arm with nominal stress method.Conclusions are as follows:The shear fork arms bear the maximum stress when they are at the initial position and the highest lifting position.And the hinge holes near the lowest hydraulic leg bear the maximum force,and that means the driving force of lift hydraulic cylinder has greater intensity on the shear fork arm,and the driving force at initial lifting position is larger than the other positions.The stress concentration and maximum fatigue damage of shear fork arm occurred the same hinged holes at initial position,which not only indicates stress concentration has a greater influence on the fatigue life of shear fork arm,but also illustrates indirectly that the drive force of lift cylinder has greater impact on the fatigue life of shear fork arm.