Investigation of Mesh Sensitivity Influence to Determine Crack Characteristic by Finite Element Methods

Azimi, Majid; Mirjavadi, Seyed Sajad; Asli, Seyed Ali

doi:10.1007/s11668-016-0117-y

Cited by 16 publications

(4 citation statements)

References 28 publications

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“…Fatigue crack growth simulations were performed with varying levels of mesh refinement in an attempt to verify the FEM crack propagation analysis as the accuracy strongly relies on the minimum element size around the crack tip; therefore, the computational cost compared to the error level based on mesh size is somewhat a trade-off [30,31]. In the analysis, for comparison purposes, the same tests are also carried out for the 3D solid FEM model by creating a batch file (.bat) coding in MSC Marc/Mentat.…”

Section: Mesh Sensitivity Analysismentioning

confidence: 99%

Numerical Evaluation of Fatigue Crack Growth of Structural Steels Using Energy Release Rate with VCCT

et al. 2022

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This research presents the numerical evaluation of fatigue crack growth of structural steels S355 and S960 based on Paris’ law parameters (C and m) that are experimentally determined with a single edge notched tension (SENT) specimen using optical and crack gauge measurements on an electromotive resonance machine at constant amplitude load. The sustainable technique is replacing destructive, time-consuming and expensive approaches in structural integrity. The crack propagation is modelled using the 3D finite element method (FEM) with adaptive remeshing of tetrahedral elements along with the crack initiator elements provided in simulation software for crack propagation based on linear elastic fracture mechanics (LEFM). The stress intensity is computed based on the evaluation of energy release rates according to Irwin’s crack closure integral with applied cyclic load of 62.5 MPa, 100 MPa and 150 MPa and stress ratios of R = 0 and 0.1. In order to achieve optimized mesh size towards load cycle and computational time, mesh and re-mesh sensitivity analysis is conducted. The results indicate that the virtual crack closure technique VCCT-based 3D FEM shows acceptable agreement compared to the experimental investigation with the percentage error up to 7.9% for S355 and 12.8% for S960 structural steel.

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Section: Mesh Sensitivity Analysismentioning

confidence: 99%

Numerical Evaluation of Fatigue Crack Growth of Structural Steels Using Energy Release Rate with VCCT

et al. 2022

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“…The study is intended to discuss the influence of the effective parameters of the excavating procedure including soil characteristics, TBM parameters, and tunnels position. Since the Finite Elements (FE)-mesh coarseness of the model is important and it has some effects on the results [50,51]. the 15-node triangular element used for simulating soil behavior in the model.…”

Section: Three-dimensional Numerical Modelmentioning

confidence: 99%

3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

Forsat

Taghipoor

Palassi

2021

Int. J. Pavement Res. Technol.

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The present research exposes the investigation on three-dimensional modeling of the single and twin metro tunnels for the case of the Tehran metro line. At first, simulation implemented on the comparison of the ground movements in the single and twin tunnels. Then the simulation has been performed on the influence of effective parameters of EPB-TBM on the surface settlements throughout excavation. The overcutting, shield conicity, grouting, and the final lining system modeled and the influence of face supporting pressure, grout injection pressure, as well as the clear distance of the tunnels, has been analyzed. The initial results showed a valid ground settlement behavior. The maximum settlements occurred at the end of the shield tail and it was higher in the single tunnel. The face supporting pressure had more effect on the surface settlement in comparison to the grout injection pressure. By increasing the face pressure in the single tunnel, the place of maximum settlement moved back while the grout pressure is insignificant for decreasing the settlements. Furthermore, the influence of the clear distance in the twin tunnels led to zero after the length of 30 m. Accordingly, for more distances, the tunnels must be examined independently and as two different single tunnels.

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“…Some examples of its application are simulations of the effect of weathering (Mishra et al, 2022;Zaid et al, 2022); the challenges involved in the selection of excavation techniques, support types, and dynamic effects (Khan et al, 2022); and static loading (Zaid and Mishra, 2021). Come things to consider in order to obtain a useful numerical model are the mesh characteristics (Azimi et al, 2016), the parameters selected according to actual data or the methodology used for construction (Forsat et al, 2022), and the impact of the constitutive model employed (Huang et al, 2020, Hejazi et al, 2008; if these are carefully considered, they will allow for an accurate reproduction of geotechnical conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Tunnel Elastic and Elasto-Plastic Deformations with Approximations Obtained from 3D-FEM Simulations

Equihua-Anguiano,

Álvarez-Cornejo,

Concha-Sánchez

2023

Ing. Inv.

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Nowadays, there are computer tools designed to simulate engineering problems. Numerical simulations in three dimensions (3D) are the closest to reality, but they require a significant amount of time and experience. In this paper, the aim is to present formulae and graphs obtained from numerical simulations using the finite element method (FEM). Their application decreases the time required to obtain deformations in the periphery of different tunnel sections and further serves to evaluate them for different excavation lengths in the face of unexpected geotechnical changes during drilling. Using the RS2 and RS3 software, 3D analyses were carried out according to the Mohr-Coulomb (MC) model, considering elastic and elasto-plastic perfect behaviors as well as isotropic and anisotropic conditions. The graphs presented herein allow obtaining displacements from an axisymmetric model to infer the 3D displacements horseshoe tunnels, and the polynomial expressions aid in determining the displacements of an established excavation length. Finally, comparisons between the displacements reported by other authors and those obtained with the polynomial expressions are presented as a means of validation for this research.

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Investigation of Mesh Sensitivity Influence to Determine Crack Characteristic by Finite Element Methods

Cited by 16 publications

References 28 publications

Numerical Evaluation of Fatigue Crack Growth of Structural Steels Using Energy Release Rate with VCCT

Numerical Evaluation of Fatigue Crack Growth of Structural Steels Using Energy Release Rate with VCCT

3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

Evaluation of Tunnel Elastic and Elasto-Plastic Deformations with Approximations Obtained from 3D-FEM Simulations

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