The Research On The Fatigue Character Of Automotive Stabilizer Bar Based On Damnification Tolerance Design

Car stabilizer bar, an important safety component of the vehicle independentsuspension, plays a role in the car’s turning and the resistance. Its performance willdirectly affect vehicle safety, stability and comfort. At present, China automobilestabilizer bar design is in the experience and analog stage, and the fatigue design islack of scientific basis, resulting in the low fatigue calculation accuracy and thecost of waste. Therefore, to study the fatigue properties of automotive stabilizer barhas a very important practical significance.Traditional fatigue estimation methods are based on no material defects andcracks. But the actual parts in the manufacturing process often already had such asdefects and cracks. In order to consider the impact of these initial cracks anddefects, the damage tolerance design method was proposed on the basis of fracturemechanics.In this paper, we use the stabilizer bar as the research object. And analyzed theactual conditions of the stabilizer bar, after the analysis and comparison of existingfatigue life estimation methods and the fatigue life of the design of the stabilizerbar, taking into account the initial flaws or cracks in the process of processingstabilizer fatigue life, we select the damage tolerance fatigue life of the whole lifemethod of stabilizer bar. Fatigue life simulation on the stabilizer bar is analyzed byfinite element fatigue analysis software on computer. Fatigue test of stabilizer baris used on special test stand. After comparative analysis the experimental data,theoretical calculations, results of finite element analysis, we proposed computersimulation and damage tolerance of the whole life of the calculation method andstabilizer bar fatigue life estimation method. Application results show that, methodcan effectively deal with the stabilizer fatigue life and the roll angle stiffnesscalculation. And the accuracy is higher than single computer simulation ortheoretical calculations. Today the computer technology development rapidly, thecombination of computer simulation and theoretical is the inevitable trend ofdevelopment of mechanical design in the future.