| Citation: | DONG Leiting, HE Shuangxin. SGBEM-FEM coupling for thermoelastic fracture mechanics analysis of rotational components[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(9): 1702-1709. doi: 10.13700/j.bh.1001-5965.2022.0140(in Chinese)
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Rotational components undergo complex loads which can easily initiate cracks, resulting in fatigue and fracture failures. For thermal-loaded rotational components with cracks, the finite element method (FEM) was applied to the global structure without cracks, thus exerting the advantage of FEM in numerical analysis of large-scale structure; meanwhile, the symmetric Galerkin boundary element method (SGBEM) was employed to the subdomain around the crack, thereby developing the advantage of SGBEM in fracture analysis. The SGBEM super element, which took the influence of the rotational inertia loading and the thermal loading into consideration, was developed in this paper. The stiffness matrix of the obtained SGBEM super element was symmetric and positive semidefinite, where the rotational inertia loading and the thermal loading only influence the equivalent force vector. Thus, the SGBEM super element can be directly assembled with the stiffness matrix and the equivalent force vector of the FEM, and be coupled with the FEM to solve the thermoelastic fracture problem of rotational components. Stress intensity factors of the cracked rotational disk undergoing the thermal loading were computed, which validates the effectiveness of SGBEM super element and FEM coupling method.
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