Aiming at the problem that steering knuckles are prone to cracking in service

the static load and load spectrum extracted by multibody dynamics software were used to conduct finite element analysis of structural strength of aluminum alloy steering knuckle with complex center holes in multi-load channels. Using the inertia release as the boundary condition

the static strength of the knuckle was calculated under the six limit conditions. Multiaxial stress fatigue analysis was carried out based on nCode software by combining 9 kinds of reinforced pavement and 2 kinds of driving conditions. The results showed that the maximum stress occurred on the upper end face of the connecting bolt hole between the upper swing arm and the hub

the maximum displacement occurred on the connecting pull arm of the front beam arm

and the PEEQ value was 0

but it was not enough to cause the static damage. The fatigue life of 1.182 3×106 km met the design requirements. The load extraction of test site

static strength calculation and fatigue life prediction via CAE can provide an important basis for optimizing the design of steering knuckle.