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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (9): 225976-225976.doi: 10.7527/S1000-6893.2021.25976

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Application of X-FEM in a phase-field model for crack propagation

ZHANG Ziyu, HAO Lin   

  1. Loads and Flutter Department, Shanghai Aircraft Design & Research Institute, Shanghai 201210, China
  • Received:2021-06-17 Revised:2021-09-27 Online:2022-09-15 Published:2021-11-23

Abstract: Both phase-field and Extended Finite-Element Methods (X-FEM) are important means of simulating crack propagation. In this work, we propose combining these two approaches to utilize their individual benefits based on a novel medial-axis algorithm. Consequently, we can still capture complex crack geometries while having crack surfaces explicitly modeled by modifying the mesh with the X-FEM. The key idea of the medial-axis algorithm is to construct auxiliary mesh, connect the intersection points of the auxiliary mesh and phase-field isocontour and eventually generate medial axes which are composed of piecewise line segments. A numerical example shows the consistency of load-displacement curves before and after medial-axis based mesh cutting, which validates the feasibility of combing X-FEM and phase-field approaches.

Key words: X-FEM, phase-field model, medial axis, crack propagation, fracture mechanics

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