Lei Meng

Simulation of Single Crystal Nickel-Based Superalloys Creep on Finite Element Method

Based on finite element Method a dynamic mathematical model is established, and the simulation of stress distribution around the defects of single crystal nickel-based superalloysis also established with ANSYS. After the change of stress field with time is analyzed, the result is compared with that achieved through numerical calculation and experimental analysis. The comparison shows that the finite element method is effective to study the stress distribution and can provide basis for creep features and microstructure evolution.

A New Finite Element Simulation by Genetic Search Algorithm

By means of measuring creep curves, microstructure observation and FEM analysis of the stress field near the hole; an investigation has been made into the influence of the defects on creep behaviors and microstructure evolution of single crystal nickel-based superalloys. Results show that the creep lifetimes and plasticity of the single crystal nickel based superalloys are obviously decreased by microstructure defects. During high temperature creep, the stress isoline near the holes region displays the feature of the acetabuliform distribution, and possesses the bigger stress value at 45° angle direction relative to the applied stress axis. That results in the γ phase transformed into the rafted structure at 45° angle direction relative to the applied stress axis, and the circular holes defects are elongated into the ellipse in shape along the direction parallel to the applied stress axis.

Artificial Neural Network Simulation for Finite Element Analysis

Artificial neural networks are composed of interconnecting artificial neurons. Artificial neural networks may either be used to gain an understanding of biological neural networks, or for solving artificial intelligence problems without necessarily creating a model of a real biological system. Average interpolating scaling function is constructed with symmetric interpolating scaling function, and the two scaling functions are given the relationship between the derivatives, which provides a convenient approach for the interpolation, and greatly improve accuracy.

GA Wavelet Transform Direction for γ-Phase Shaped Finite Element Analysis

1040 °C was studied during the period imposed 137MPa tensile creep nickel-base single crystal superalloys γ/γ the evolution of two-phase approach. ANSYS finite element method is using a single crystal alloy with / without external load when the Von Mises stress in the gand γ two phase distribution. The comprehensive analysis of the formula, the coefficient values usually experience, not very accurate, this article dealing with GA coefficient. This algorithm uses orthogonal crossover to generate initial population and uses elitist-crossover to increase the good patterns of the population and uses hybrid mutation to increase the ability of local and global optimization. It has shown fascinating results when being used in the optimization of multimodal function. The results showed that: In the creep period, the corresponding cubic γ along the von Mises stress and strain energy density of the crystal face to form raft-like organizations.

Research of Alloy Orb on Wavelet

via completely after heat-treatment, [111] orientation of single crystal alloy structure is still cubic  phase at way coherency are ordered in matrix g panel and the direction rules arrangement; In high temperature and tensile stress creep period, with stress axes ordered  has formed certain Angle raft shape organization, creep later in nearly fracture zone, raft shape  ordered caring and distortion in happen, with strain increases, coarsening and distorted aggravating, until the present wavy shape; During the creep [111] orientation of single crystal alloys deformation characteristics is a wrong in  matrix channel to sports and shear raft shape  phase, due to form larger, more variable dislocation cut ordered after raft shape , occurred in dislocation bunch of sets and its formation and crystal structure; Among them, the matrix channel to inherit the maximum shear dislocation slip is made of alloy with larger strain rate main reason.

Based on Immune Genetic Algorithm of Alloy Heat Research

In this paper single crystal alloys [111] orientation on tensile stress creep performance testing and organization was observed, on the high temperature and low stress conditions, combining with the creep characteristics of SEM observation, organizational morphology constructed raft shape g in 3d space ordered phase mode of existence of; Study the single crystal alloys [111] orientation in high-temperature creep of tensile stress during directional coarsening regularity, and using the finite element method, this paper analyzes the monocrystal [111] orientation in ni-based alloy cubic / two-phase interface von Mises stress distribution and the lattice strain energy change rule, through the immune genetic algorithm analysis [111] orientation of single crystal alloy phase of evolution rule ordered .

Single Crystal Alloy on the Creep Behavior of Holes in Three-Dimensional Finite Element Simulation

Based on finite element Method a dynamic mathematical model is established, and the simulation of stress distribution around the defects of single crystal nickel-based superalloysis also established with ANSYS. Results show that the creep lifetimes and plasticity of the single crystal nickel based superalloys are obviously decreased by microstructure defects. During high temperature creep, the stress isoline near the holes region displays the feature of the acetabuliform distribution, and possesses the bigger stress value at 45 angle direction relative to the applied stress axis. That results in the  phase transformed into the rafted structure at 45 angle direction relative to the applied stress axis, and the circular holes defects are elongated into the ellipse in shape along the direction parallel to the applied stress axis. During creep, a smaller value of the stress distribution displays in the up and down regions of the circular holes, and the maximum value of the stress distribution exhibits the apices region in the sides of the hole.