Analysis of assembly hole cracking of the steering knuckle support of a certain vehicle model
A certain vehicle model reported cracking in the assembly hole of the steering knuckle support during the road test.Observation and analysis of the cracking area by electron microscopy and metallographic microscopy revealed fatigue striations.Using Altair Hypermesh and Abaqus software,a CAE assembly model was established to analyze the stress changes of the steering knuckle support.The force load of the bolts was extracted through ADAMS simulation software to calculate the minimum anti-slip force.The clamping force was measured by using an ultrasonic axial force measurement system and a multifunctional threaded fastener simulation assembly testing system,and the results showed that the clamping force of the bolt was less than the designed minimum anti-slip force,causing the installation surface to slip,and the steering knuckle support to experience fatigue cracking due to the impact force of the bolt.The mechanical performance level of the bolts and nuts was improved,and the torque angle technology was adopted to improve the assembly clamping force.The effectiveness of the measures was verified through process validation and road testing.
steering knuckleassembly hole crackingobservation and analysisstress analysisminimum anti-slip forcetorque angle