Study on Load Spectrum of Evolution Accelerated Test for Fatigue Spalling of Angular Contact Ball Bearings under Varying Working Conditions

doi:10.3901/JME.2024.13.193

Abstract

Abstract: Due to the complex load variation of aeroengine mainshaft bearing under actual operating conditions, it is a great challenge to accelerate the test by load spectrum under varying operating conditions in laboratory environment.This complexity becomes more complicated in the accelerated test of aero-engine mainshaft bearing under varying working conditions, and it is difficult to analyze and model the evolution law of fatigue spalling fault of bearing. In order to study and verify the construction method of fatigue spalling failure evolution acceleration test load spectrum, the fatigue spalling failure evolution mechanism of angular contact ball bearings under different load conditions is modeled and analyzed. A quasi-dynamic model of 7208AC angular contact ball bearing considering temperature and lubrication is established, and its contact parameters are solved. Based on the extended finite element method (XFEM), a simulation model of fatigue spalling fault evolution on the surface of bearing raceway is established, and the iterative updating criterion of the simulation model is used to simulate the fatigue spalling fault evolution with the contact parameter as the input and the crack growth speed and direction based on the fracture mechanics analysis. A bearing acceleration test load spectrum with an acceleration factor of 1.5 is developed based on the evolutionary mechanism of spalling fault analysis, and verified by the established simulation model of fatigue spalling fault evolution. The results show that the actual fatigue spalling acceleration factor of bearing is close to the theoretical value under the proposed variable condition acceleration test load spectrum, which can provide important theoretical basis and method support for the acceleration test of aeroengine mainshaft bearing.

Key words: quasi-dynamic model, fatigue spalling, crack propagation, finite element analysis, accelerated test

CLC Number:

TG156

DENG Zhiming, HUANG Tudi, HUANG Hongzhong, WEI Xunkai, WANG Hao. Study on Load Spectrum of Evolution Accelerated Test for Fatigue Spalling of Angular Contact Ball Bearings under Varying Working Conditions[J]. Journal of Mechanical Engineering, 2024, 60(13): 193-204.

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