Fatigue Reliability Analysis of Aero-engine Gear Transmission System Considering Thermal-mechanical Loads

doi:10.3901/JME.260094

Abstract

Abstract: Gear transmission system is an important component of aero-engines, operating under long-term thermal-mechanical load conditions. Its fatigue reliability has become a key limit on the service performance of machines. However, current reliability assessment methods of gear transmission systems do not consider the combined effect of thermal-mechanical loads, making them difficult to assess fatigue reliability. A fatigue reliability analysis method based on the "fatigue life-operation history" interference theory for aircraft gear transmission systems is proposed, considering fatigue strength degradation caused by temperature rise and the load spectrum effect. It is found that the fatigue damage of key components of the transmission system under the thermal-mechanical loading condition is significantly different compared with that under merely mechanical loading. The fatigue reliability of the transmission system under thermal-mechanical loading is improved by 21.5% through the selection of gear materials with high strength and heat resistance.

Key words: aero engine, gear transmission, thermal-mechanical loads, fatigue damage, reliability

CLC Number:

V233

LU Kaiyi, WANG Zeng, WANG Xianliang, LU Zehua, LIU Huaiju. Fatigue Reliability Analysis of Aero-engine Gear Transmission System Considering Thermal-mechanical Loads[J]. Journal of Mechanical Engineering, 2026, 62(3): 407-419.

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