基于仿真计算的推力架传动轴损伤分析

Simulation calculation based fracture analysis of thrust frame drive shaft

某水平推力架传动轴出现断裂故障,根据水平推力架结构组成和工作原理对其传动轴损伤机理进行分析,可得出该断裂为低周疲劳所致。基于ANSYS Workbench平台建立传动轴的模型,对传动轴进行强度分析,给出工作载荷下的应力强度、应变及变形计算结果。通过计算结果分析传动轴薄弱部位,得出与传动轴失效部位状态一致。对其进行改进设计,改进后基于强度分析的一种损伤分析方法对传动轴进行损伤仿真分析,得出了使用寿命次数、安全系数和损伤系数的仿真计算结果。通过对照改进前后仿真数据,结果表明改进后的传动轴安全性提高,强度提高,同时结合应力与屈服强度公式计算出传动轴的许用应力满足传动轴设计要求。

Because of the fracture occurred on horizontal thrust frame transmission shaft, the transmission shaft damage mechanism is analyzed according to the composition and working principle of the horizontal thrust frame structure. The analysis result shows that the fracture is caused by low cycle fatigue. The model of the transmission shaft was established based on ANSYS Workbench platform to make strength analysis of the shaft. Stress, strain and deformation calculation result under the working load are given. The weak positions of the drive shaft are analyzed according to the calculation results, by which a conclusion that the state of the drive shaft failure parts is consistent is got. Its design was improved. The fracture simulation analysis for drive shaft was carried out by means of the improved analysis method based on the strength analysis. The simulation calculation results of service life, safety factor and damage coefficient are given, and the damage coefficient calculation results. The contrast of simulation data before and after improvement indicates that the improved shaft＇ssecurity has been enhanced, and strength increased. Combined with the stress and the yield strength formula, the allowable stress of the transmission shaft is calculated, which satisfies the design requirement of the shaft.