Comparison of KI calculation methods

Qian, Guian; González-Albuixech, V.F.; Niffenegger, Markus; Giner, Eugenio

doi:10.1016/j.engfracmech.2016.02.014

Cited by 36 publications

(13 citation statements)

References 32 publications

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“…These methods are based on displacement extrapolation and/or energetic approach such as integral J/integral interaction. Methods detailed in the reference Qian [12]. Zhu [13] showed that the energy approach provides good result in com- parison with analytical results, reason why the computation of factor KI by the energetic approach is independent of the mesh near the crack.…”

Section: Stress Intensity Factor Kimentioning

confidence: 88%

Computation of the stress intensity factor KI for external longitudinal semi-elliptic cracks in the pipelines by FEM and XFEM methods

Fakkoussi

Moustabchir

Elkhalfi

et al. 2018

Int J Interact Des Manuf

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Evaluation of structural integrity of a cracked structure has become an important matter in the industrial field since couples of decades. However, damage process occurred in a structural component is not yet fixed. The objective of this research was to compute the stress intensity factor KI, in mode I, using in the linear elastic domain, by the finite element method and the extended finite element method. The defect studied in this survey has a form of a longitudinal semi-elliptic crack, located on the outer surface of the tube. A summary of the paper contains a numerical convergence for each method in terms of accuracy and limitations. The proposed methodology and outcomes released from this study act as novel design tool for the industrial engineers when is required to generate a robust solution for product development working in critical conditions.

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Section: Stress Intensity Factor Kimentioning

confidence: 88%

Computation of the stress intensity factor KI for external longitudinal semi-elliptic cracks in the pipelines by FEM and XFEM methods

Fakkoussi

Moustabchir

Elkhalfi

et al. 2018

Int J Interact Des Manuf

View full text Add to dashboard Cite

show abstract

“…In this study, the interaction integral is employed to extract the SIF; this method has been implemented in commercial ABAQUS. Qian et al 35 have compared different numerical methods for calculating SIF. They have concluded that the SIF calculated by interaction integral is an appropriate method to determine accurate SIF values for 3 D cracks.…”

Section: Repaired Platementioning

confidence: 99%

Numerical analysis of cracked aluminum plate repaired with multi-scale reinforcement composite patches

Yousefi

Mashhadi

Safarabadi

2020

Journal of Composite Materials

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In this study, numerical modeling is used to investigate the performance of a single-sided composite patch with different scale fillers, as reinforcement of a cracked aluminum plate under static tension. The main concerns of previous studies are about the geometry of patches, composite layups, and failure of adhesive. In this research, the effect of patch properties such as size and fiber volume fraction, the thickness of patch, and thickness of adhesive on the overall performance of the cracked aluminum plate are investigated numerically. Indeed, first, a 3 D representative volume element (RVE) is adopted to calculate the mechanical properties of carbon nanotube (CNT)/epoxy and carbon fiber (CF)/epoxy composite patch at each specified volume fraction for investigating the effect of patch properties on the performance of a single-sided patch for crack repairing. In this regard, the cohesive zone model is adopted to analyze the debonding between the epoxy matrix and reinforcement to characterize the mechanical properties of composite patches. Finally, a linear 3 D finite element analysis is performed to calculate the stress intensity factor (SIF) for cracked aluminum plate repaired by a single-sided composite patch at each specified reinforcement volume fraction for different thickness of patch and different thickness of adhesive. The results demonstrated that the stress intensity factor highly depends on the patch properties (patch stiffness) in addition to patch thickness and adhesive thickness.

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“…Meanwhile, the hexahedron elements are added outside to improve the calculation accuracy. 18,19 The finite element model of crossbores with a crack at the intersecting line is shown in Figure 4. Specifically, the structure of crossbores is shown in Figure 4(a), and the crossbore model with meshes is shown in Figure 4(b).…”

Section: Boundary Conditionsmentioning

confidence: 99%

Research on stress intensity factor of crack at intersection of crossbores

Zhang

Zhou

2018

Advances in Mechanical Engineering

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Circular crossbore as a common geometric construction exists widely in the engineering components. Its fatigue life is heavily decreased by the crack failure around the intersecting line. So, the typical analysis model of crossbores with mode I crack is built, and the influence of four main parameters, such as thickness-diameter ratio Y, crossbores diameter ratio Q, crack length a, and axis ratio of elliptical crack face b/a, on fracture parameter K I is presented. The results show that the distribution of K I is mainly influenced by Q and b/a, and the influence of b/a is more obvious. The value of K I is mainly influenced by Y, Q, and a, while the influence of b/a is not evident. For elliptical crack face, the K Imax (maximum value of K I ) located at the short axis leads to higher crack growth rate. K Imax is a crucial factor of fracture criterion, and the significance of factors on it is also analyzed here. A variance analysis of four factors is performed and their order is Y . Q . a . b/a. In addition, a calculation function of K Imax is built based on 294 sets' data and the error is analyzed by mean absolute percentage error with maximum error being less than 7.2%.

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Comparison of KI calculation methods

Cited by 36 publications

References 32 publications

Computation of the stress intensity factor KI for external longitudinal semi-elliptic cracks in the pipelines by FEM and XFEM methods

Computation of the stress intensity factor KI for external longitudinal semi-elliptic cracks in the pipelines by FEM and XFEM methods

Numerical analysis of cracked aluminum plate repaired with multi-scale reinforcement composite patches

Research on stress intensity factor of crack at intersection of crossbores

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