Research on the Dynamics of Crankshaft Under the Condition of Operating Mode Based on LS-DYNA

Abstract

A model of crankshaft under working condition is established based on LS-DYNA. The stress distributions of crankshaft and its regularities of the stress along surface of crankshaft and layer depth at the fillet are studied. The results show that the obvious stress concentration exist in the upper end of fillet on main journal and the lower end of fillet on rod journal when the piston arrives at top dead center, and the maximum equivalent stress occurs at the fillet on rod journal, so the fracture of crankshaft is most likely to occur in the lower end of fillet on rod journal. With the increase of depth, the stress on the surface of fillet reduces correspondingly, and the equivalent stress begins to stabilize when the depth reaches up to 2.8 mm. The study of maximum working stress provides the theory basis for the selection of residual stress.

Keywords

• crankshaft
• explicit dynamics
• distribution regularities
• residual stress