Numerical analysis of a main crack interactions with micro-defects/inhomogeneities using two-scale generalized/extended finite element method

“…For the 3D computational design of actively cooled panels, Tan and Geubelle (2017) present Latin American Journal of Solids and Structures, 2022, 19(7), e465 3/15 a reduced thermal model and a gradient-based shape optimization technique. Malekan and Barros (2018) investigated the behavior of micro-defects and inhomogeneities around a main crack through the global-local strategy of the GFEM.…”

Section: Introductionmentioning

confidence: 99%

A generalized finite element interface method for mesh reduction of composite materials simulations

Alves

Evangelista

Paiva

2022

Lat. Am. j. solids struct.

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This paper proposes interface and polynomial enrichments using the generalized finite element method (IGFEM) for the material interface in composite materials without matching the finite element mesh to the boundaries of different materials. Applications in structural members such as laminated beams and heterogeneous composites (matrix and inclusions) employing coarse and fine meshes are employed. The results were compared with conventional GFEM and analytical solutions. Verification and simulations proved the efficiency of the suggested framework for solving problems with discontinuous gradients resulting from a material interface. The proposed method allows flexibility in mesh generation for composite materials by letting the interface be embedded in an element without the need to match the mesh to the material interface. This improves the computational efficiency over conventional methods.

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“…In their model, both macro- and micro-crack surfaces modeled only in the local problem using the discontinuous and singular enrichment functions. More recently, Malekan and Barros 23 investigated a static analysis on the effects of micro-defects and micro-inhomogeneities on a main crack behavior using a two-scale generalized FEM, while modeling the micro-defects/inhomogeneities only in the local problem.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a main fatigue crack interaction with multiple micro-cracks/voids in a compact tension specimen repaired by stop-hole technique

Malekan

Carvalho

2018

The Journal of Strain Analysis for Engineering Design

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Fatigue is a process in engineering materials in which damage accumulates due to the fluctuating loading. One solution for a component under the fatigue process is to arrest the crack propagation before the final failure using different available retardation methods, such as drilling/stop-hole technique. In addition, structural components may also suffer from the existence of micro-cracks or voids due to their forming process or service lives. These micro-cracks/voids are very critical to study, since they can effectively play an important role in the behavior of the existing main crack in a component. This article aims to investigate the effect of the stop-hole retardation technique and multiple micro-cracks/voids with different characteristic lengths and geometries on the fatigue crack propagation in a compact tension specimen. A modified Forman equation, the so-called NASGRO equation is used to define the transition between crack initiation and crack growth period. Also, the extended finite element method is adapted in the crack propagation phase in order to model crack path in the geometry eliminating the need for remeshing procedure. The whole analyses are conducted in a commercial package through a user-written code that handles all fatigue crack growth analysis. The reference solutions from the literature are used to compare and to validate results obtained from current work.

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Numerical analysis of a main crack interactions with micro-defects/inhomogeneities using two-scale generalized/extended finite element method

Cited by 11 publications

References 49 publications

Mixed-mode stress intensity factors evaluation of flat shells under in-plane loading employing ordinary state-based peridynamics

Mixed-mode stress intensity factors evaluation of flat shells under in-plane loading employing ordinary state-based peridynamics

A generalized finite element interface method for mesh reduction of composite materials simulations

Analysis of a main fatigue crack interaction with multiple micro-cracks/voids in a compact tension specimen repaired by stop-hole technique

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