Abstract: Suspension system is an important structure device for vehicle safety driving.Taking a heavy vehicle single trailing arm suspension as the research object,the explicit dynamic elastoplastic of the suspension system is analyzed by using the theory of stress wave propagation under three typical working conditions,by constructing model based on ABAQUS.Analysis result shows that:the stress under three different conditions are larger;dynamic load is the most important damage factor on suspension structure;the weld connecting and sharp corners has obvious stress concentration and plastic deformation;the suspension structure is relatively weak in the areas that the steering knuckle and steering longitudinal arm hinged joints.According to the strength and stiffness analysis results,the suspension structure was optimization designed,and verified by the test.The test result shows that the dynamic explicit elastic-plastic performance analysis method is practical and effective for calculating the stress and strain under the dynamic load condition.

Key words: single-longitudinal arm suspension, suspension, explicit dynamics, elasticity-plasticity, stress, optimization