Application of NURBS in the Fracture Mechanics Framework to Study the Stress Intensity Factor

Montassir, Soufiane; Moustabchir, Hassane; Elkhalfi, Ahmed

doi:10.19139/soic-2310-5070-1553

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…11), which are not sufficient because of their large disparity; this concentration is reduced for high values of n, where the number of levels is greater with shorter leg lengths. In order to better investigate the stress concentrations at legs intersections, a 3D XFEM model can be adopted for local induced stress concentrations and crack propagation modeling as it was carried out by Montassir et al [32]. (n = 3,q = 10) (n = 8,q = 10)…”

Section: Contribution Of Internal Forces To Total Strain Energymentioning

confidence: 99%

Finite Element modeling and convergence analysis of a new Biomimetic Branching Structure.

RIHANI,

Akhrif,

El Jai

et al. 2024

Stat., optim. inf. comput.

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Branching structures are gaining popularity in the field of advanced structures and building design; they offer high performance in terms of strength and lightweight design, along with the flexibility and precision enabled by modern processing technologies like Additive Manufacturing. This paper provides a concise overview of a geometric design procedure for a novel ribbed class of structures which was previously developed by the authors as a biomimetic optimal Micro-architected dome. Hereinafter, linear lattice models are suggested to carry out structural calculations using the finite element method (FEM). The objective is to examine discretization thresholding and strain energy convergence criteria. Results show that convergence is reached for numbers of elements per leg, ranging from 2 to 6, depending on the geometrical configuration of the dome being studied. The strain energy balance also exposes the influence of each internal force on the total mechanical response of the structure, pinpointing bending moment and axial force as the main decisive factors. As a perspective, the study will focus on limit state design calculations and Analysis of how the local geometry influences the overall stability and strength of this new design.

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Section: Contribution Of Internal Forces To Total Strain Energymentioning

confidence: 99%

Finite Element modeling and convergence analysis of a new Biomimetic Branching Structure.

RIHANI,

Akhrif,

El Jai

et al. 2024

Stat., optim. inf. comput.

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“…Therefore, to obtain a numerical solution describing fluid flow, the domain should be divided into elements, in which the equations are solved for every cell, the exhaust manifold was meshed to 81851 Nodes using a tetrahedral mesh. To gain more detailed insights into the impact of the crack on specific characteristics of the exhaust manifold, we will be focusing on the pipe of the exhaust manifold that has been subjected to a semi-elliptical fracture [27], which is denoted by its red frame as shown in Figure 3.…”

Section: Figure 2 Perspective View Of the Exhaust Manifoldmentioning

confidence: 99%

Analyzing the Impact of Cracks on Exhaust Manifold Performance: A Computational Fluid Dynamics Study

Nouhaila,

Hassane

2024

IJHT

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The exhaust manifold system plays a vital role in the internal combustion engine of a vehicle, functioning in conditions of high temperature and pressure. The objective of this analysis is to assess how the presence of the crack influences the pressure drop across the exhaust manifold. Understanding pressure drop is essential in determining the efficiency of the exhaust system and its effect on engine performance. Furthermore, we investigate how a crack in the exhaust manifold affects the flow patterns of exhaust gases, including changes in velocity, pressure distribution, and turbulence within the manifold; The results of the analysis show that the crack has various implications for both the performance and structural integrity of the manifold. It causes an increase in pressure drop across the manifold, resulting in reduced engine efficiency. Additionally, the crack induces turbulence or vortex formation in the exhaust gases, further impacting the system's performance, and finally, the impact of the presence of a crack typically results in an elevated coefficient of friction.

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“…To evaluate the stress intensity factors (SIF), it is possible to use an isometric analysis in order to control the crack propagation (Montassir et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

2D numerical modeling of crack propagation using SFEMD method of a LEHI material

Bentahar,

Youcef,

Mahmoudi

et al. 2024

SEES

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Numerical methods today play a useful and important role in solving various problems related to fracture mechanics including modeling crack propagation, fretting fatigue and cohesion... Furthermore, these methods have been widely used to solve problems in linear and nonlinear fracture mechanics in cases of elastic, plastic fracture problems. The evaluation of stress intensity factor in 2D and 3D geometries, thus these techniques widely used for non-standard crack configurations. The objective of this work is study the effects of the crack length and the number of structural elements on the two crack parameters such as the stress intensity factor KI and KII and the contour integral (J). As well as presenting a numerical modeling of crack propagation, for a LEHIM (Linear Elastic Homogeneous Isotopic Material) with mechanical characteristics by the method SFEMD (Stretching Finite Element Method Developed), the model chosen with quadratic elements with 4 nodes (CPE4). However, this method is based on the effect of the number of contours and the number of elements around the crack tip on the variation of the stress intensity factors. In addition, the crack propagation criterion (MCSC) was used, a computer program was created in FORTRAN language to develop and evaluate the stress intensity factors and the contour integral (J). Several examples of crack lengths a = 0.7, 1.4, 2.1, 2.8 and 3.5 mm were used. Additionally, the number of items has been changed several times. The stress intensity factors of modes I and II and direction angles (α) are calculated to solve the problem using the ABAQUS finite element code. The results obtained by the SFEMD method and the results of the analytical method are very close.

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Application of NURBS in the Fracture Mechanics Framework to Study the Stress Intensity Factor

Cited by 4 publications

References 22 publications

Finite Element modeling and convergence analysis of a new Biomimetic Branching Structure.

Finite Element modeling and convergence analysis of a new Biomimetic Branching Structure.

Analyzing the Impact of Cracks on Exhaust Manifold Performance: A Computational Fluid Dynamics Study

2D numerical modeling of crack propagation using SFEMD method of a LEHI material

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