X-FEM analyses of a thin-walled composite shell structure with a delamination

Nagashima, Toshio; Suemasu, Hiroshi

doi:10.1016/j.compstruc.2010.01.008

Cited by 42 publications

(18 citation statements)

References 21 publications

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“…As it was expected, by increasing the delaminated area the predicted buckling loads are reduced. The calculated buckling loads, especially the fundamental ones, are in a good agreement with Ref [6]. In the final example, the non-linear buckling analysis of the previous plate is carried out.…”

Section: Delamination Buckling Analysissupporting

confidence: 81%

Xfem Analysis – Including Buckling – Of Composite Shells Containing Delamination

Rust¹,

Yazdani²,

Wriggers³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Based on a first-order shear-deformation theory a four-noded shell element is formulated for composite laminates with and without a delamination. Interlaminar stresses are calculated to evaluate a delamination criterion. The presentation will show how and how accurate. Once the danger of delamination is detected the displacement field is enriched in the sense of the eXtended FEM to account for a discontinuity at an arbitrary position. The remaining strength after starting delamination is simulated by a mixed-mode cohesive zone model based on energy release. Contact when reclosing a discontinuity is included. Large rotations are covered by Green's strain. The developed formulation is tested for shell problems by comparing its results with available benchmark tests for in-and out-of-plane load cases. The feasibility and practicality of the presented model and its advantage over the approach using two shell elements at the predefined plane of the discontinuity, connected by a third one, a cohesive zone element, is demonstrated. Then, linear and non-linear buckling analyses for composite laminates containing a delamination are performed. It is shown how imperfections of the delamination type, i.e. concerning the discontinuity, used for nonlinear analysis are based on the modes from linear buckling. The full process from starting with one layer of elements over detecting a delamination to simulating its growth and its interaction with buckling is outlined.

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Section: Delamination Buckling Analysissupporting

confidence: 81%

Xfem Analysis – Including Buckling – Of Composite Shells Containing Delamination

Rust¹,

Yazdani²,

Wriggers³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…The extended finite element method [2][3][4][5] can approximate the discontinuous displacement field near cracks independently of the finite element mesh through the use of interpolation functions, which can describe the displacement field near cracks in the structure. Therefore, crack modelling for stress analyses in the field of fracture mechanics can be performed more easily by XFEM than by conventional FEM.…”

Section: Introductionmentioning

confidence: 99%

Using Extended Finite Element Method for Computation of the Stress Intensity Factor, Crack Growth Simulation and Predicting Fatigue Crack Growth in a Slant-Cracked Plate of 6061-T651 Aluminum

Hedayati¹,

Vahedi²

2014

WJM

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The 6061-T651 aluminium alloy is one of the most common aluminium alloys for marine components and general structures. The stress intensity factor (SIF) is an important parameter for estimating the life of the cracked structure. In this paper, the stress intensity factors of a slant-cracked plate, which is made of 6061-T651 aluminum, have been calculated using extended finite element method (XFEM) and finite element method (FEM) in ABAQUS software and the results were compared with theoretical values. Numerical values obtained from these two methods were close to the theoretical values. In simulations of crack growth at different crack angles, the crack propagation angle values were closer to the theoretical values in XFEM method. Also, the accuracy and validity of fatigue crack growth curve were much closer to the theoretical graph in XFEM than the FEM. Therefore, in this paper the capabilities of XFEM were realized in analyzing issues such as cracks.

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“…N. Moës et al implemented the XFEM to model the delamination and its propagation for membrane structures in [14]. T. Nagashima simulated the buckling response of the discontinuous composite shells by using the XFEM formulation and the isoparametric shell element in [15]. J.L.…”

Section: Basic Equations Of Fsdt In Xfem Schemementioning

confidence: 99%