Creep-fatigue life design method for complex geometric structural member

Abstract

The invention provides a creep-fatigue life design method for a complex geometric structural member. The method comprises the steps: establishing a turbine disc three-dimensional solid model and a temperature field; determining a constitutive model and material parameters of the material of the turbine disc; considering the centrifugal force of the turbine disc, and applying centrifugal loads according to the load condition of the structural member in actual work; respectively selecting a fatigue damage model and a creep damage model, and writing the fatigue damage model and the creep damage model into a subprogram UVARM; substituting the subprograms to obtain a total damage cloud chart, and further obtaining a service life distribution cloud chart of the turbine disc; seeking the optimalsolution of long service life and high load by changing the temperature field and centrifugal load of the turbine disc in the load maintaining stage. According to the service life design method, temperature distribution, fatigue damage and creep damage of the structural member are considered in simulation, the service life of the load structural member under different service temperatures and loadhistories can be predicted, and the method has the advantages of being visual, wide in application range and high in accuracy.

Description

technical field [0001] The invention relates to a creep-fatigue life design method for complex geometric structural parts, and belongs to the field of finite element numerical calculation of mechanical properties of materials. Background technique [0002] With the rapid development of my country's aerospace field, we have higher requirements for the comprehensive performance of materials. The "Twelfth Five-Year Development Plan for High-end Equipment Manufacturing Industry" promulgated by the Ministry of Industry and Information Technology in 2012 and the "Technology Roadmap for Key Areas of <Made in China 2025>" promulgated by the National Manufacturing Power Construction Strategy Advisory Committee in 2015 will both Aerospace equipment is listed as the key direction for the development of high-end equipment manufacturing industry at this stage. Among them, aeroengines, as the "heart", have a decisive impact on the progress and success of aerospace equipment develop...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing ABAQUS-based finite element simulation method for turbine disk creep-fatigue life prediction is that it often uses a constant temperature field, which cannot reflect the real service temperature field, and generally only considers fatigue damage and neglects creep damage , which is inconsistent with the objective situation of obvious creep damage after exceeding a certain temperature under the test

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