Comparison of SIF solutions obtained by XFEM and conventional FEM for cracks in complex geometries like valve body

Galić, Ivica; Čular, Ivan; Vučković, Krešimir; Tonković, Zdenko

doi:10.1016/j.prostr.2018.12.200

Cited by 9 publications

(5 citation statements)

References 7 publications

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“…The XFEM method, birthed from unit decomposition theory, is a computational technique that incorporates discontinuous shape functions to tackle fracture element discontinuity in fracture processes. In the context of crack propagation calculation, the XFEM method first calculates the stress field close to the crack tip through the crack tip's displacement field; then, leveraging J-integral theory, it determines the crack tip's stress intensity factor based on the calculated stress field results [32]. Typically, the standard XFEM displacement approximation calculation function can be expressed as follows:…”

Section: Principle Of Extended Finite Element Methodsmentioning

confidence: 99%

Model Development of Stress Intensity Factor on 7057T6 Aluminum Alloy Using Extended Finite Element Method

et al. 2023

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The stress intensity factor represents a vital parameter within the realm of linear elastic fracture mechanics. It acts as the cornerstone in determining crack propagation and evaluating damage tolerance. However, calculating this factor is a complex task. To surmount this challenge, models of the stress intensity factor for both edge and center cracks were developed using the extended finite element method. The result of this effort is the ability to calculate the stress intensity factor at the crack tip under different loads and normalized crack lengths. The accuracy of these calculations was confirmed by comparing them to results from the NASGRO method, and the optimal mesh sizes for both the crack elements and overall units were established. Further analysis, conducted through MATLAB’s regression analysis, led to the development of an empirical model. This model was found to be both simple and reliable, making it an ideal tool for engineering applications.

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Section: Principle Of Extended Finite Element Methodsmentioning

confidence: 99%

Model Development of Stress Intensity Factor on 7057T6 Aluminum Alloy Using Extended Finite Element Method

et al. 2023

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“…Extended finite element method serves as an accurate and easier method to evaluate SIF. Comparison of SIF solutions obtained by XFEM and conventional FEM for cracks in complex geometries like valve body and found that XFEM is accurate in evaluating SIF 4 . The size of the mesh affects the accuracy of the SIF evaluation in commercial finite element software 5 .…”

Section: Literature Reviewmentioning

confidence: 97%

Stress Redistribution Near a Crack in Maraging Steel using Composite Patch

Bhadra

Gopalan

2021

Def. Sc. J.

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The presence of a crack significantly reduces the load bearing capacity of a structure made of fracture prone material. The conventional process of repairing a defect is gouging and filling the gouged location by rewelding. It is not only time consuming but also constrained by the number of repairs that can be done as material properties degrade with each round of rewelding. In an attempt to overcome the limitation of the conventional repair process, repairing a defect using composite patch is proposed. The study is carried out on Maraging steel (M250) and the defect considered is a crack. Stress intensity factor (SIF), being an important parameter in fracture-based design, it is evaluated in Abaqus. Extended finite element method is used to model the crack. SIF is used to predict the failure load of a surface cracked tension specimen and the same is compared with the values reported in literature. Composite patch is modelled using woven ply properties. A separate layer of adhesive is also modelled to predict the properties adhesive properties. Failure analysis of each component namely, the Maraging steel plate, the composite patch and the adhesive is carried. It was observed that the addition of a composite patch completely nullifies the presence of a crack. The patch with thickness 1mm and woven ply properties is having minimal damage initiation and likely to survive. The adhesive properties required is also obtained from the finite element analysis. Thus, it was observed that a composite patch with woven ply properties and thickness 1mm is able to completely nullify the effect of a crack when bonded with a suitable adhesive as predicted by the analysis.

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“…Numerical modelling based on the extended finite element method (XFEM) by linear analysis (that is widely used in the process of fracture and crack growth) is used to obtain the results. However, this modelling approach has limitations in that it incurs a high computational cost and it is difficult to achieve convergence in some scenarios [23]. This approach incorporates certain degrees of freedom of the nodes that 5.…”

Section: Finite Element Modellingmentioning

confidence: 99%

Design Criteria for Scantling of Longitudinal and Transverse Connections in the Torsion Box Under Fatigue Loading

Silva-Campillo

Suárez

Herreros-Sierra

2021

Polish Maritime Research

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Fatigue is one of the main failure modes in marine structures, and it is caused by the strong cyclic characteristics of the loads they support. This failure mode is amplified in areas of high stress concentration, such as at the intersection of primary and secondary elements. In this paper, a two-phase study is proposed that compares numerical and experimental results using a digital image correlation technique. The described procedure establishes selection, design, and scantling criteria and provides recommendations for the design of the transverse structure using specimens with different geometries. These geometries correspond to different designs for the transverse primary structure that use a longitudinal secondary stiffener with variable thickness and longitudinal spacing to transverse in a dynamic and quasi-static regime. The stress state for this regime is calculated based on the biaxiality indication concept, which uses the fatigue phenomenon (safety factor and sensitivity curves) and fracture mechanics (parameters of the Paris crack propagation law, correlation value, and law of variation of the stress intensity factor).

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Comparison of SIF solutions obtained by XFEM and conventional FEM for cracks in complex geometries like valve body

Cited by 9 publications

References 7 publications

Model Development of Stress Intensity Factor on 7057T6 Aluminum Alloy Using Extended Finite Element Method

Model Development of Stress Intensity Factor on 7057T6 Aluminum Alloy Using Extended Finite Element Method

Stress Redistribution Near a Crack in Maraging Steel using Composite Patch

Design Criteria for Scantling of Longitudinal and Transverse Connections in the Torsion Box Under Fatigue Loading

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