The Integration Design For Heterogeneous Turbine Blade In Consideration Of Manufacture Process

Continuously improving the turbine working temperature is the key approach to enhancing the comprehensive performance of aircraft engine,which produces rigorous challenge to materials science,mechanical structure and so on.Within this context,some great researchers introduce Heterogeneous Object into Aero engine turbine blade design field in order to meet different functional requirements.This kind of part composed of multi-phase materials which transition smoothly in the design space,making physical properties change smoothly,thus to utilize their separate characteristics.The first major bottleneck is to create heterogeneous objects model that can contain varying material composition information and part geometric information.This motivates us to seek better solutions for Heterogeneous turbine blade modeling including theoretical representations and material design.It has great significance for improving design modeling theory and guiding engineering practice.A model representation method that applies NURBS basis function to the coupling of geometry and material distribution is presented,which provides a better digital model for heterogeneous component's concurrent design,optimization and simulation analysis.For complex parts with holes,this paper decomposes the domains of parts with complex topological features by automatically generating media axis of plane area and then establishes the NURBS volumes.The material design mechanism of heterogeneous components is perfected.In consideration of the preparation process for the first time,diffusion is explored,a basic physical phenomena that widely exists in most preparation process.And material design takes the mechanism as a significant basis.Then a mathematical model describing this phenomenon is established by using Poisson equation.Above partial differential equation is successfully solved through isogeometric Analysis(IGA)method.The IGA of multi-area splicing model and the processing method of corresponding boundary conditions are mainly studied.The traditional approach's problems are avoid completely,including that material distribution function is difficult to determine,mesh quality is strongly relied on.Considering the difference between turbine blades and those of common parts,this paper firstly analyses the structural characteristics of turbine blades and establishes parameterized NURBS solid model of blade's structure through domains' decomposition and re-stitching technology.And Combining with IGA algorithm that stitches several areas to a body,the material field in blade is calculated,which finishes the fusion designs of geometry and material of heterogeneous turbine blade.Finally,this paper takes NASA C3 X turbine blade as a verification object,discusses the Integration Design method of heterogeneous turbine blade composed of metal Al6061 and Si C ceramics,and is compared with the modeling method of heterogeneous material parts using technique of tetrahedral mesh approximation,which shows that this paper can realize the accurate express of parts' geometry and materials.The examples prove that material design obtained from this method can meet the basic requirements of heterogeneous material parts' material distribution,providing a new idea for design and modeling of heteroge neous material parts with more complex structures.