Research Of Fatigue And Fracture Performance Of Tripper’s Driving Axle Based On Numerical Simulation

Fatigue failure is the main failure mode of mechanical engineering, manycatastrophic accidents are caused by fatigue failure. These accidents not only threatenthe people’s lives and properties, but also resulted in the huge economy lose.Therefore, study the fatigue failure of materials and structures has great engineeringand practical significance.There three purpose of fatigue study: firstly, life extension, that is accuratelypredict the fatigue life of the structure; secondly, life extension, extend the service lifeof the structures by changing design; thirdly, optimize the fatigue test, that is simplifyfatigue test or shorten fatigue test time. In this paper, prediction the fatigue life andprolong service life of tripper’s driving axle.The driving axle is an important part of tripper car. In order to evaluate the safetyof the shaft, numerical simulation has been used to study the stress and strain fields,fatigue life and fatigue crack expanding life of transverse cracking. The method lays atheoretical foundation for integrity evaluation criterion of tripper’s driving axle.Following works have been done in this paper:(1)The finite element method is used to calculation the example’s fatigue life andthe fracture mechanics parameters such as the stress intensity factor K, comparingwith theoretical solutions, we can come to the conclusion that the finite elementmethod is reliable to calculate the fatigue life and the fracture mechanics parameters.Thus lays the methods foundation for ANSYS analyze fatigue life and the crackexpansion life of tripper’s driving axle.(2)The finite element method is used to analyzed the axle’s stress and strainfields and mechanical property of stress concentration region, determine the criticalpoint, which provides reference for its fatigue analysis.(3)The fatigue life of axle is studied, which give some theoretical instructions tothe engineering utilities. Discussed and analyzed several factors that effect the fatiguelife, it will provide theory guide to axle’s structural improvement.(4)The structural optimization design of the driving shaft is conducted usingAPDL in ANSYS, and the optimal diameter value is obtained. (5)Simulated fracture mechanics parameters of axle with transverse cracking,and get the smooth curve between crack initial lengths and crack expansion life,critical crack also were worked out. According to the service life of the axle arrive atits initial crack size.