Fatigue crack propagation at aeronautic engine vane guides using the extended finite element method (XFEM)

Developments in remeshing‐free fatigue crack growth simulation including a new adaptive virtual crack closure technique

“…In addition, it can be seen that, unlike the other algorithms, XFEMPN-VCCT is sensitive to the planar assumption and always gives a better life prediction when the PE assumption is used. Moreover, it must be highlighted again that these comprehensive results refute the fundamental opinion in Bergara et al 22 , caused by the SERRcalculation error each of the three numerical-based FCG algorithms, while RUL S and RUL A are the remaining useful life in numerical simulation and analytical-based analysis, respectively. In this figure, a PE assumption is used for cases 1 to 3; however, case 4 is considered to be PS.…”

“…Bergara et al 21 examined the XFEMPN-VCCT algorithm for simulating two complex 3D FCG situations, one in a 4-point bending test and the other in an aeronautic engine vane guides. 22 Although it was inferred that this algorithm is capable of capturing the complex evolving crack shapes, the accuracy of life prediction is unclear in their works since there are no analytical baselines. Employing the XFEMPN-VCCT algorithm, Gupta et al 23,24 investigated the FCG in orthotropic steel deck.…”

Multi-Scale Model Crack Extension Study Based on XFEM

“…The multi-point constraint method is used here, and since the most essential connection between different scale models at the interface should be the displacement relationship between the nodes at the interface, the constraint equation can be found by coupling the displacement of macroscopic and fine unit nodes at the interface connection. Combined with the finite element analysis software ABAQUS, the macroscopic and fine cell coupling can be realized by multi-point constraint equations, whose unified form can be written as c(𝐮 𝐁 , 𝐮 𝐬 ) = 𝐮 𝐁 − 𝐂𝐮 𝐬 = 0 (9) where is the displacement vector at the interface connection of macroscopic cells; is the displacement vector at the interface connection of fine cells, and is the coefficient matrix of the interface connection constraint equation.…”

“…However, these methods have certain problems in solving large scale ship fracture problems, for example, the traditional finite element must consider the defects inside the object when dividing the mesh, making the cell boundary consistent with the geometric boundary, which inevitably forms a local mesh encryption, and the rest This inevitably results in a non-uniform mesh distribution of the regional coefficients, which greatly increases the computational cost, and therefore it is difficult to balance the computational cost and the computational scale when solving the local fracture problem of some large ships. For the drawbacks of finite element treatment of discontinuous interface problems such as cracks, the extended finite element method [9][10][11] is a more optimal solution. In XFEM, the discontinuous crack surface and the computational mesh are independent of each other, and the division of cells does not depend on the geometric interface of the crack, and the mesh should not be re-divided after the crack is extended, so that the discontinuous mechanics problem [12] can be analyzed conveniently.…”

Investigating Fatigue Mechanisms and Crack Growth in 20mntib Steel High-Strength Bolts: An Experimental and Simulation Study

“…Researchers such as Shi et al [22], Malekan et al [23], and Shu et al [24] found that XFEM could accurately predict fracture location, crack propagation path, fatigue fracture morphology, and fatigue life of standard specimens. Additionally, Samai et al [25], Bergara et al [26], and Ngoula et al [27] employed XFEM to examine fatigue crack growth in connection plates with varying joints, aero-engine blades, and cruciform welded joints, respectively. Pandey et al [28] simulated the fatigue life of compact tension (CT) specimens and turbine disks composed of different materials using continuum damage mechanics and XFEM.…”