Abstract: The chain is the core component of NSE elevator.The chain fracture brings to users the larger production costs and safety concerns.It is of great importance to improve the service life of the chain by research the measures and methods.In view of the chain failure modes,to analyze the failure reasons,the chain structure had been analyzed by finite method on the static strength analysis.It was proved the structure design of the chain satisfies the requirement of static strength.The S-N curve of the parts was calculated,The fatigue life of the chain was analyzed further,It is concluded that the main causes of failure is fatigue damage on the chain.The fatigue analysis results are very close with the average service life of chain plate in the actual production,it was showed that the fatigue simulation is effective,and the corresponding improvement measures was put forward from the aspects of manufacture process and use.After the implementation of improvement measures,the service life of the chain has increased dramatically in practice.Therefore,when the experimental research is not carry out objectively,it is feasible to obtain more accurate simulation of the fatigue life test by fatigue analysis for the parts.

Key words: chain plate, ANSYS, fatigue life analysis