Step-by-step coupling simulation method of dry sliding friction heat, stress and abrasion

Abstract

The invention relates to a step-by-step coupling simulation method of dry sliding friction heat, stress and abrasion. The method comprises the following methods that a friction heat, stress and abrasion coupling process is divided into steps, initialization is performed to the heat and stress coupling analysis, a heat conduction analysis of N incremental steps is sequentially completed by using a transient state heat conduction analysis procedure and an output temperature field is obtained, initialization is performed to the stress and abrasion analysis, the unit type of a finite element model stress analysis is set to conduct the stress analysis and an output contact pressure field is obtained, the abrasion volume is calculated and the spatial direction is determined according to the temperature field, the contact pressure field and the relative sliding rate of contact nodes of two contact surfaces, the contact pressure deviation is calculated, the displacement of the contact nodes is corrected and the finite element model is updated according to the abrasion volume and the direction, the contact pressure is updated by judging whether the contact pressure deviation is over the tolerance, and whether the simulation process is finished is judged. The step-by-step coupling simulation method is high in calculating precision and calculating efficiency and suitable for the simulation of strong coupling of the dry sliding friction heat, stress and abrasion.

Description

technical field [0001] The invention relates to a dry sliding friction coupling simulation method, in particular to a dry sliding friction heat-stress-wear step-by-step coupling simulation method. Background technique [0002] Friction heat-stress-friction and wear coupling phenomenon exists in the dry sliding friction interface. Frictional heat is mainly generated in the frictional contact surface between two contact surfaces, and the heat flux of frictional heat is related to tangential frictional stress and relative slip velocity. Frictional heat will directly cause the temperature of the contact surface to rise rapidly, and the rapidly rising temperature will cause thermal deformation of the contact surface, which will eventually redistribute the contact pressure on the contact surface unevenly. Under the action, the contact surface gradually wears out. Due to the uneven distribution of contact pressure on the contact surface and the difference in the relative slip vel...

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Problems solved by technology

[0003] This coupling behavior is difficult to obtain an analytical solution

When using numerical methods to solve the numerical solution, if the fully coupled analysis method is used, and the two-way mutual coupling effect between friction heat-stress-wear is considered in each time increment step, the calculation efficiency is extremely low, and it is impossible to solve the comparative analysis. Long-term friction heat-stress-wear coupling problem, but if the sequential coupling method is used, that is, the temperature field is analyzed first, and then the stress-wear coupling analysis is performed, and the coupling item of stress and wear on the heat conduction direction is ignored, the calculation accuracy is sacrificed , only for weakly coupled frictional heat-stress-wear problems

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