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摘要
In view of the early?stage short crack propagation behaviour in turbine disks under low?cycle fatigue, a method coupling crystal plasticity (CP) theory and extended finite element method (XFEM) was proposed to simulate short cracks in engineering structures.The method used the total cumulative shear strain in crystals as the criterion of crack propagation and made the crack propagate along the slip plane with the most active slip system.By using sub?model technology/regional refinement of grids and a combination of macro?micro constitutive models, the framework overcame the scale mismatch between the real engineering structure and the micro model, and then predicted the short crack propagation path and rate in the dangerous section of a technique turbine disk at an acceptable calculation cost.The results showed that the short crack propagation path and rate in structures was highly affected by crystal orientations, resulting in a large dispersion of fatigue life.At the same time, it verified the feasibility of the CP?XFEM?based framework in predicting the short crack propagation life of engineering structures. ? 2022, Editorial Department of Journal of Aerospace Power. All right reserved.
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