Effect of XFEM mesh density (mesh size) on stress intensity factors (K), strain gradient (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:mrow><mml:mfrac><mml:mrow><mml:mi>d</mml:mi><mml:mi>ε</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">dr</mml:mi></mml:mrow></mml:mfrac></mml:mrow></mml:math>) and stress corrosion cracking (SCC) growth rate

Bashir, Rehmat; Xue, He; Zhang, Jianlong; Guo, Rui; Hayat, Nasir; Li, Ganbo; Bi, Yueqi

doi:10.1016/j.istruc.2020.03.037

Cited by 17 publications

(7 citation statements)

References 24 publications

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“…is method does not require the meshing and mesh size to be related to the surrounding stress field, and remeshing is not necessary for the simulation of crack propagation. XFEM is based on conventional finite element methods and includes enhanced functions for cracks and crack tips to describe the discontinuity of cracks [20,21]. Figure 1 shows the propagation of an arbitrary crack within the elements of an XFEM model (elements through which the crack propagates have their nodes annotated by hollow squares, and the elements where the crack tips are located are indicated by hollow circles).…”

Section: Methods and Principlesmentioning

confidence: 99%

An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams

Zhou

Jaturapitakkul

Wang

et al. 2021

Mathematical Problems in Engineering

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The concrete face of a rockfill dam is a long and thin slab structure, which is highly susceptible to fracture when subjected to the settlement of the dam. The study of the generation and propagation of cracks in the concrete face of rockfill dams is of great significance to dam construction and face crack prevention. In this study, the initiation and propagation of cracks in the concrete face of a rockfill dam are investigated using an extended finite element method (XFEM) and ABAQUS software for the Gongboxia concrete-face rockfill dam. A numerical model for this dam is established using a finite element method, and the face stress and deformation distributions are obtained. Based on the results, a numerical model is built to find the location where cracks are initiated in the face. The displacement of the entire model is treated as the equivalent displacement for the numerical model. XFEM is utilized throughout the modeling process to obtain the stress concentration, crack initiation, and crack propagation in the concrete face, and an analysis of crack initiation and propagation is conducted. Finally, the effects of the thickness of concrete covers and reinforcement layers on the stress intensity of crack tips are also discussed using the established numerical model, and techniques for controlling the fracturing of the concrete face have been proposed in this paper.

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Section: Methods and Principlesmentioning

confidence: 99%

An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams

Zhou

Jaturapitakkul

Wang

et al. 2021

Mathematical Problems in Engineering

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“…The region ahead of the crack-tip is called the core region [28]. To obtain the von Mises plastic region(elastic-plastic region from crack-tip) [29] and the relation of crack direction with strain energy density, consider an elastic-plastic plate having an inclined crack at an angle, , to the direction of a uniaxial load as shown in Figure 5.…”

Section: Application Of Von Mises Stress In S-criterionmentioning

confidence: 99%

Prediction of the Direction of XFEM Crack Based on Von Mises Around the Crack-tip under Mode-I

Bashir¹,

Hou²,

Usman³

et al. 2021

Preprint

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The extended finite element method (XFEM) is now widely used in crack simulations and the direction of propagation of the XFEM crack in SS-304 has been quite interesting. This paper discusses the direction,θ(+ve in anti-clockwise direction), of the XFEM crack (under mode-I) propagation based on the von Mises stress-field around the crack-tip for static loading under the light water reactors (LWRs) conditions. The Mises core region from the crack-tip is chosen for β=〖90〗^o, the angle between the load and the initial crack. Experimental data for LWRs’environment is obtained and the simulations have been carried out applying three different static loads and results for the direction of the crack are calculated by measuring the stress-field around the crack-tip. It has been found that the direction of the XFEM varies inversely as the stress-field around the crack tip is increased. The computational results have been compared with the numerical results based on the minimum strain energy density criterion[S-criterion].

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“…The current need is to shift SCC to the XFEM. 43 Figure 11 represents the SIF variations at different applied loads concerning the distance from the crack-tip. It can be seen that the values of the SIFs in the case of XFEM are constantly changing.…”

Section: Effect Of Macrostructural Properties On Plastic Zone Sizementioning

confidence: 99%

Effect of Material Macrostructural Parameters on Quantitative Stress Corrosion Cracking Plastic Zone Using Extended Finite Element Method in Welded Joints for Light Water Reactor Environment

et al. 2020

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Alloy 600, a nickel-chromium alloy, has an outstanding corrosion resistance with excellent fabricability and is used in light water reactors(LWRs) at elevated temperatures. The alloy is also being considered for an advanced reactor concept because of its high allowable design strength at the elevated temperature. The Alloy 600 is a power hardening material and basic plastic properties of the alloy are changed in the welded zone due to inhomogeneity in weld joints. The extended finite element method(XFEM) is used in which the problem of variations invariably in the stress intensity factors, K, at a different instant rate exists. This paper focuses on the effect of variations in macrostructural properties of the alloy on stress corrosion cracking(SCC) plastic zone ahead of crack-tip using XFEM.To control the variations in the K, a new technique is also introduced in this research. The results show that the plastic zone is affected by K(increases with the increase of K), yield strength(plastic zone decreases with the increase in yield strength), and hardening exponent ânâ(core region increases with the increase of exponent) of the materials. Simulations are carried in ABAQUS 6.14 and results are compared with experimental data.

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Effect of XFEM mesh density (mesh size) on stress intensity factors (K), strain gradient (dεdr) and stress corrosion cracking (SCC) growth rate

Cited by 17 publications

References 24 publications

An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams

An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams

Prediction of the Direction of XFEM Crack Based on Von Mises Around the Crack-tip under Mode-I

Effect of Material Macrostructural Parameters on Quantitative Stress Corrosion Cracking Plastic Zone Using Extended Finite Element Method in Welded Joints for Light Water Reactor Environment

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