3D effects on crack front core regions, stress intensity factors and crack initiation angles

Khan, Shafique M.A.; Merah, Nesar; Adinoyi, Muhammed J.

doi:10.1016/j.ijsolstr.2013.01.019

Cited by 14 publications

(10 citation statements)

References 38 publications

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“…Piping systems bends at 90° are the weak zone in transport of hydrocarbons and can lead to fatigue damage. The mechanical and the geometrical characteristics of composite patch and adhesive play an essential role to repair the pipeline elbow under internal pressure, crack angle and bend angle [25][26][27][28][29]. Basically, the numerical three-dimensional method shows several results for cracked elbow and it's repaired by composite patch to increase lifetime of piping system [25][26][27][28][29].…”

Section: Resultsmentioning

confidence: 99%

“…The obtained results show the influence of elbow thickness with/without patch on stress intensity factors which depend as the thickness of pipeline for cracked elbow taking into Finite element method investigation of geometrical influences of adhesive and patch in the safety for 90° elbow piping system 5979 account the different pressures and angle of the cracked elbow [28][29]26]. Several states have been studied by varying the elbow thicknesses for different pressures 50, 60 and 70 bar respectively, at 15° of crack angle without patch as shown in the figures 6.…”

Section: Thickness Effect In the Elbowmentioning

confidence: 93%

“…The variation of SIF with angle crack for different pressures is investigated. It has been observed that the values of SIF increases with the increase of crack angle [26,27,5]. It is seen that the distribution of the stress especially in the zone of great stresses is related with the dangerous cracks zones [27][28][29].…”

Section: Sif Versus the Crack Angle With Deferent Pressurementioning

confidence: 93%

“…For improving the SIF data, the elbow is able to be used where the simulation on crack zone is carried out using the 20-node brick elements with mesh refinement near the crack tip [20][21][22][23][24][25]. For precision, mainly the mesh in the crack front was refined in the elbow crack to simulate the stress intensity factor [25][26][27][28][29][30].…”

Section: Finite Element Modelingmentioning

confidence: 99%

“…In this study, the effect of the composite patch thickness shows on the repair of cracked elbow which depends on the impact of crack angles and pressures as shown in the figures 10 and 11. It is seen that the crack propagation from the cracked elbow to the composite patch through the adhesive layer length has an important influence on the SIF values taking into account the adhesive quality, where by the proportional method; we can observe that the increase of the patch thickness and the decreases the SIF at the cracked piping system enables to avoid the failure phenomenon [34][35]26].…”

Section: Effect Of the Patch Thickness On The Elbow Crackedmentioning

confidence: 99%

See 4 more Smart Citations

Finite element method investigation of geometrical influences of adhesive and patch in the safety for 90° elbow piping system

Gadi

Meriem-Benziane

Bouiadjra³

2019

JMES

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Piping system elbow study is the most important part in all fields of hydrocarbons transportation which presents the behaviour of circumferential crack at elbow extrados. The effect of geometry of adhesive and patch in the crack elbow is important in pipeline safety. This study shows the details for along the direction of the circumferential elbow crack by three dimensional (FEM) which is used to determine the stress intensity factor at 90° elbow for two cases: firstly, without patch and secondly, repaired with composite patch. This method allows to predict the behaviour of cracked elbow through the analysis of crack propagation under the internal different pressures taking into consideration the operating conditions. The geometry and nature of composite patch proved that the increase of patch thickness leads to decrease the SIF from 7 MPa.m 1/2 to 6.15 MPa.m 1/2 . It can be concluded that the repairing by composite materials leads to reduce the stress intensity factor with patch which not only can augment the lifetime of pipeline but also decreasing the costs and the pollution.

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Section: Resultsmentioning

confidence: 99%

Section: Thickness Effect In the Elbowmentioning

confidence: 93%

Section: Sif Versus the Crack Angle With Deferent Pressurementioning

confidence: 93%

Section: Finite Element Modelingmentioning

confidence: 99%

Section: Effect Of the Patch Thickness On The Elbow Crackedmentioning

confidence: 99%

See 3 more Smart Citations

Finite element method investigation of geometrical influences of adhesive and patch in the safety for 90° elbow piping system

Gadi

Meriem-Benziane

Bouiadjra³

2019

JMES

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Fatigue strength of Al7075 notched plates based on the local SED averaged over a control volume

Berto

Lazzarin

2013

Sci. China Phys. Mech. Astron.

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When pointed V-notches weaken structural components, local stresses are singular and their intensities are expressed in terms of the notch stress intensity factors (NSIFs). These parameters have been widely used for fatigue assessments of welded structures under high cycle fatigue and sharp notches in plates made of brittle materials subjected to static loading. Fine meshes are required to capture the asymptotic stress distributions ahead of the notch tip and evaluate the relevant NSIFs. On the other hand, when the aim is to determine the local Strain Energy Density (SED) averaged in a control volume embracing the point of stress singularity, refined meshes are, not at all, necessary. The SED can be evaluated from nodal displacements and regular coarse meshes provide accurate values for the averaged local SED. In the present contribution, the link between the SED and the NSIFs is discussed by considering some typical welded joints and sharp V-notches. The procedure based on the SED has been also proofed to be useful for determining theoretical stress concentration factors of blunt notches and holes. In the second part of this work an application of the strain energy density to the fatigue assessment of Al7075 notched plates is presented. The experimental data are taken from the recent literature and refer to notched specimens subjected to different shot peening treatments aimed to increase the notch fatigue strength with respect to the parent material

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A new procedure for investigating three-dimensional stress fields in a thin plate with a through-the-thickness crack

Wang

2018

Sci. China Phys. Mech. Astron.

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3D effects on crack front core regions, stress intensity factors and crack initiation angles

Cited by 14 publications

References 38 publications

Finite element method investigation of geometrical influences of adhesive and patch in the safety for 90° elbow piping system

Finite element method investigation of geometrical influences of adhesive and patch in the safety for 90° elbow piping system

Fatigue strength of Al7075 notched plates based on the local SED averaged over a control volume

A new procedure for investigating three-dimensional stress fields in a thin plate with a through-the-thickness crack

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