|Table of Contents|

Low cycle fatigue life prediction of a liquid rocket engine turbine disk(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年06期
Page:
13-21
Research Field:
研究与设计
Publishing date:

Info

Title:
Low cycle fatigue life prediction of a liquid rocket engine turbine disk
Author(s):
DU Dahua1; WANG Jun1; WANG Hongjian2; HE Erming2
(1.Science and Technology on Liquid Rocket Engines Laboratory,Xi'an 710100, China; 2.College of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China)
Keywords:
fatigue life;  low cycle fatigue;  turbine disk;  liquid rocket engine
PACS:
V434.2
DOI:
-
Abstract:
Turbine is an important energy conversion component of liquid rocket engine, whose working reliability will be directly related to the safety of engine and even space vehicle.Therefore, it is urgent to accurately predict the fatigue life of turbine disk.First, a full three-dimensional unsteady gas-heat-solid coupling analysis of turbine was carried out, and the pressure and temperature loads of turbine during start-stop and stable operating were present.Then, the elastic-plastic analysis was performed under the combined action of centrifugal force, aerodynamic load and thermal load, so the stress-strain response data of turbine disk during the startup and shutdown transient processes and the stable operating stage was obtained.Thirdly, the Morrow elastic stress linear correction method for average stress correction was adopted.The Von-Mises stress correction method and the Manson-McKnight multi-axial stress method were used to convert the multi-axial stress effect into a uniaxial stress effect.Based on the fatigue performance test data of GH4586, a method for modifying the strain-life prediction formula based on the principle of equal life was proposed.Finally, based on the modified Manson-Coffin(M-C)general slope equation of local stress-strain, the low cycle fatigue(LCF)life of the hot end structure of disk under working cycle was predicted accurately.The research shows that, the turbine disk has a certain safety margin of fatigue strength, the impact of force and thermal shock on fatigue life of disk is greater during the startup process, and the conclusions can also provide a reference for the fatigue strength design of turbine.

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