An equivalent model for mechanical analysis of single crystal cooled blade with film cooling holes using crystal plasticity

Modern cooled turbine blades made of single crystal superalloy contain lots of film cooling holes. It is difficult to simulate the mechanical behavior of the blade as so many holes. Developing precise equivalent model is an effective method to solve this problem. In this work, an equivalent model based on crystallographic theory has been presented to deal with film cooling holes. A unit cell model with film cooling hole and an equivalent model without cooling hole are established to determine the equivalent parameters first. And then the flat specimen made of single crystal with 14 holes is designed to verify the feasibility of the equivalent method. The tensile test and finite element simulation are carried out to study the load–displacement curve of specimen. The experimental results and fracture surface of specimens show that the equivalent method based on local failure is reasonable. The method is a useful way to analyze the mechanical behavior of cooled blade with film cooling holes and to avoid the fracture of the cooled blade.