Prediction method of pitting corrosion and spalling risk for elastoplastic contact fatigue of carburized hardened gears

Abstract

The invention discloses a method for predicting the risk of elastoplastic contact fatigue pitting and peeling of a carburized hardened gear. The method comprises the following steps of: 1, according to the hardness curve of a gear material and a linear relationship between the hardness and the yield strength, obtaining the local yield strength of the gear; 2, according to the geometric parameter of a gear pair, simplifying the contact state of an engaging position into a rigid semicircle and flexible body two-dimensional contact model, and establishing the two-dimensional contact model based on an ABAQUS platform; 3, based on a Python programming language and the local yield strength of the material, adding material properties to the two-dimensional contact model; 4, calculating the Dang Van equivalent stress below a tooth surface in combination with a gear working condition; and 5, dividing the Dang Van equivalent stress by the local yield strength of the gear material to obtain a fatigue failure risk value at any point in the key contact area. The method has a technical effect of predicting the risk of elastoplastic contact fatigue pitting and peeling of the hardened gear, and provide guidance for the design, use and manufacture of the hardened gear.

Description

technical field [0001] The invention belongs to a method for predicting the fatigue failure risk of mechanical parts, in particular to a method for predicting the failure risk of elastic-plastic contact fatigue pitting and spalling of a surface-hardened gear pair represented by carburizing and quenching. Background technique [0002] In high-speed and heavy-duty machinery, the problem of contact fatigue failure of carburized hardened gears has become one of the important bottlenecks that limit the reliability of equipment. The common forms of contact fatigue failure of hardened gears are pitting and spalling. These two failure problems It will bring great potential safety hazards and economic losses, and there are many factors affecting the contact fatigue failure of hardened gears, such as working conditions, gradients of material mechanical characteristics, residual stress, etc. In addition, the gear contact process is accompanied by time-varying multiaxial stress states, m...

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Problems solved by technology

[0002] In high-speed, heavy-duty machinery, the problem of contact fatigue failure of carburized hardened gears has become one of the important bottlenecks that limit the reliability of equipment. The common forms of contact fatigue failure of hardened gears are pitting and spalling. These two failure problems It will bring great potential safety hazards and economic losses, and there are many factors affecting the contact fatigue failure of hardened gears, such as working conditions, gradients of material mechanical characteristics, residual stress, etc. At present, the understanding and control of the contact fatigue mechanism of carburized heavy-duty gears is not deep enough, and there are great difficulties in predicting the failure risk in engineering practice

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