Stress intensity factors for internal surface cracks in autofrettaged functionally graded thick cylinders using weight function method

Seifi, Rahman

doi:10.1016/j.tafmec.2014.11.004

Cited by 20 publications

(11 citation statements)

References 30 publications

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“…It is known that both of these are results from the finite element method. The semi-elliptical surface cracks is widely accepted in the fracture mechanics field either from plates under tension [22], notched round bars under cyclic tension and bending [23], thick cylinders [24] or even for weld heat-affected zones [19]. The present work shown in this study is fundamental work for larger aspects.…”

Section: Introductionmentioning

confidence: 79%

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

Shaari

Akramin

Ariffin³

et al. 2016

J. MECH. ENG. SCI.

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The finite element method (FEM) is commonly used is solving engineering problems including fatigue crack growth. The S-version FEM is an extended version of the FEM to predict fatigue crack growth. This method was developed into open-source software written in C/C++ language and built based on the UNIX operating system. The objective of this study is to perform a prediction for fatigue crack growth using the S-version FEM. This S-version FEM was structured using the global-local overlay technique that consisted of two separate meshes for global and local. Therefore, the computation process was solely focused on the local area instead of whole geometries. This undoubtedly reduced computation time and dependency on conventional FEM software. The geometry of the problem was modelled in FAST (pre-post) program and referred to as a global mesh, and the mesh was automatically generated in FAST. The location of the crack refers to the local mesh and at this stage smaller elements and finer mesh were made at the crack area. Local mesh was overlaid with global mesh. Then the global-local overlay approach was used to compute the engineering problem. The stress intensity factor (SIF) was calculated using the virtual crack closure-integral method (VCCM). The prediction of the fatigue crack growth results are shown in this study as well as the behaviour of the SIF corresponding to the crack growth. Analytical solutions were compared with the Sversion FEM to validate the results. A very good agreement was presented between the S-version FEM and analytical approach for the normalised SIF. In addition, regression analysis was performed to support the evidence. From the analysis, very small root mean square errors (RMSE) of 0.12 with high correlation coefficient (R 2 ) of 99.74% were shown to confirm the findings. From this study, it can be concluded that the S-version FEM is suitable to be used to predict fatigue crack growth for semi-elliptical surface cracks. The application of the S-version FEM benefits the user because using the overlay approach shortens the computation process.

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Section: Introductionmentioning

confidence: 79%

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

Shaari

Akramin

Ariffin³

et al. 2016

J. MECH. ENG. SCI.

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“…(3)(4)(5)(6) and (3-7)) into Eqs. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13), and some manipulations, equations are obtained which we can assemble them to a matrix form as below.…”

Section: General Problem Formulationmentioning

confidence: 99%

“…The pipe or pipe-bend having a crack on the outer surface was subjected to internal pressure or opening bending moment in their research. Seifi [11] determined the stress intensity factors for internal surface cracks in autofrettaged functionally graded cylinders. Eshraghi and Soltani [12] obtained stress intensity factors for functionally graded cylinders with internal circumferential cracks using the weight function method for different combinations of cylinder geometry, crack depth, and material gradation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stress intensity factor for internal cracks in FG cylinders under static and dynamic loading

Shariati¹,

Rokhi²,

Rayegan³

2016

Frattura Ed Integrità Strutturale

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This paper investigates the variations of mode I stress intensity factor (KI) for inner penny-shaped and circumferential cracks in functionally graded solid and hollow thick walled cylinders, respectively with the changes of crack geometry, material gradation and loading conditions. The functionally graded material of cylinders consists of epoxy and glass. It is assumed that the mechanical properties vary with a power law in the radial direction of cylinders. Micromechanical models for conventional composites are used to estimate the material properties of functionally graded cylinders. The equations of motion obtained from the extended finite element discretization are solved by the Newmark method in the time domain. The interaction integral method is employed to calculate the mode I stress intensity factor (KI). The MATLAB programming environment was implemented to solve the problem.Citation: Shariati, M., Mahdizadeh Rokhi, M., Rayegan, H., Investigation of stress intensity factor for internal cracks in FG cylinders under static and dynamic loading, Frattura ed Integrità Strutturale, 39 (2017) 166-180.

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“…They also examined the effects of the cylinder length and crack position on these factors. Seifi [4] studied the stress intensity factors for surface cracks inside the cylinder made of functional materials by employing the weight function method. Eshraghi and Soltani [5] obtained the stress intensity factors for circumferential cracks inside cylinder made of functional materials using a weight function method.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Stress Intensity Factor for an Internal Circumferential Crack in a Rotating Functionally Graded Thick-Walled Hollow Circular Cylinder under Thermal Shock

Elahi

Rokhi

2017

Archive of Mechanical Engineering

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In this article, the fracture behavior of functionally graded thick-walled cylinder under thermo-mechanical shock is investigated. For this purpose, classical coupled thermoelastic equations are used in calculations. First, these equations are discretized with extended finite element method (XFEM) in the space domain and then they are solved by the Newmark method in the time domain. The most general form of interaction integral is extracted for axially symmetric circumferential crack in a cylinder under thermal and mechanical loads in functionally graded materials and is used to calculate dynamic stress intensity factors (SIFs). The problem solution has been implemented in MATLAB software.

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Stress intensity factors for internal surface cracks in autofrettaged functionally graded thick cylinders using weight function method

Cited by 20 publications

References 30 publications

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

Investigation of stress intensity factor for internal cracks in FG cylinders under static and dynamic loading

Calculation of Stress Intensity Factor for an Internal Circumferential Crack in a Rotating Functionally Graded Thick-Walled Hollow Circular Cylinder under Thermal Shock

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