Stress analysis of crankshaft based on multi-body dynamics
The multi-body dynamic calculation of forged steel crankshaft of an engine is carried out using finite element method,the stress distribution of the crankshaft in the actual working process of the engine is analyzed,and the fracture reason of the crankshaft is determined.The results showed that under normal circumstances,the stress at the transition fillet between the eighth crank arm and the crank pin of the crankshaft is the largest,which is 350.0 MPa.When the second main bearing bolt loosens,the stress at the transition fillet of the second crank arm and crank pin is the largest,reaching 977.4 MPa.When the second main bearing bolt falls off,the maximum stress of the transition fillet between the second crank arm and crank pin reaches 995.3 MPa.In the case of loosening or falling off of the main bearing bolt,the maximum stress value of the crankshaft crankpin fillet far exceeds the yield strength of the crankshaft material,and the crankshaft is easy to crack and fracture from here.
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