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2 Journal of Theoretical and Applied Mechanics

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The influence of variations of geometrical parameters on the notching stress intensity factors of cylindrical shells

Moustabchir H., Hamdi Alaoui M. A., Babaoui A., Dearn K. D., Pruncu C. I., Azari Z.

Journal of Theoretical and Applied Mechanics

2017

Vol. 55 nr 2

559—569

The modern approach of Virtual Engineering allows one to detect with some accuracy the residual life of components especially free of cracks. The life estimation becomes cumbersome when the components contain a crack. A straightforward formulation requires a parameter that considers geometrical constraints and materials properties. The magnitude of the stress singularity developed by the tip of a crack, needs to be expressed by the Stress Intensity Factors (SIF). In order to prove the validity of the results, calibration by experimental and/or analytical technique is required. To have a better understanding of this parameter, in the first part of this paper an analytical model to compute the SIF connected to crack propagation into Mode I has been implemented. The case study displays a pipeline component with a crack defect submitted to internal pressure. Therefore, an appropriate correlation between the analytical approach and numerical simulation has been established embedded.

Numerical analysis of stress intensity factor and T-stress in pipeline of steel P264GH submitted to loading conditions

Moustabchir H., Arbaoui J., Zitouni A., Hariri S., Dmytrakh I.

Journal of Theoretical and Applied Mechanics

2015

Vol. 53 nr 3

665--672

Stress singularities occur at crack tips, corners and material interfaces. The stress intensity factors and T-stresses are coefficients of structural components where the active stress singular and first regular stress terms, respectively, are denoted by William’s eigen function expansion series. A finite element analysis by CASTEM 2000 have been undertaken in order to determine the evolution of the T-stress and stress intensity factor terms in mode I for an arc of pipeline specimens with an external surface crack. A stress difference method described by Moustabchir et al. (2012) are adapted and, in the following step, the volumetric method is then embedded to compute the SIFs and T-stress near the crack tip. Different crack geometries combined with different length-to-thickness ratios are examined for the T-stress and stress-intensity factor. The revisited stress difference method employed here shows to be an accurate and robust scheme for evaluating the T-stress/SIFs in an arc of the pipeline.