Modeling of Creep Deformation Behavior of DZ411 and Finite Element Simulation of Turbine Blade

Abstract

Creep tests were conducted on DZ411 material at 930 °C and 850 °C, and creep curves were recorded and employed in normalization creep model building. A yield function suitable for directional solidification nickel-based materials was proposed in an ascending-order approach. Combined with the normalized creep model and the proposed function, a creep subroutine was compiled to simulate the creep deformation behavior of a turbine blade. The typical boundary conditions of the blade were determined and used for finite element analysis. According to the analysis results, the assessment positions for the actual application of a turbine blade were determined and checked for endurance intensity. The phenomenon of deviation angle between crystal axis and blade height direction in actual casting was further analyzed. Multiple angles and directional deviation angles were simulated for 10,000 h creep deformation. Considering the difficulties and challenges of the complex geometric structures of blades, it is necessary to conduct creep tests of DZ411 material and a simulation analysis of a real blade. Based on the above analysis and discussion, the present work sheds light on finite element analysis and has great potential for structural analyses in the engineering applications of complex high-temperature structures.

Creep Analysis of Rotating Thick Cylinders Subjected to External and Internal Pressure: Analytical and Numerical Approach

“…The equivalent creep strain is maximum for a lower radius (0.3 m) and decreases as the radius increases from 0.3 to 0.45 m. It can be credited It is important to state that in creep modeling, it is common to attain or encounter ve high exponential coefficients. In some cases, the noticed value could reach about 10 pow −90, especially in cases where the material investigated is relatively brittle, the values strain are extremely small, and the load time history covers a very long period of time, happened in our case, but in general, when dealing with normal materials and short periods of load time history, the average reported values are around 10 power − [9,15,16,43].…”

“…Finite element analysis (FEA) is a powerful tool for predicting creep behavior in thick cylinders. It also comes with certain limitations like mesh sensitivity, convergence issues, creep anisotropy, temperature gradient, creep fatigue interaction, and model calibration [14][15][16]. Hence, the most elaborate finite element procedure yields results that are time-consuming and are not always reliable without verifying.…”