Design of fatigue endurance experiment method for automotive torsion beam based on rain-flow method

In the process of modern vehicle design and manufacture, Prediction through experimental methods and structural improvement of chassis components are an important part of improving the fatigue durability of vehicle structures. In this paper, the fatigue damage test of a vehicle is carried out by analyzing the fatigue vibration of a vehicle torsion beam member, premature failure and failure occurred. Based on the test data and results of MTS test bed, the failure analysis and life prediction of the key component are carried out. In the test design, the rain flow counting method is used to process and transform the pavement spectrum load data. According to the test results, local stress strain method and Miner criterion are used to estimate the fatigue damage of torsional beam. Finally, the damage of the torsion beam of this model was obtained through the test bench loading road spectrum test, and the main damage points were obtained through the comparative analysis of the fatigue damage prediction results. It is of great significance to study the improvement and optimization of torsion beams.