Evaluation of the effect of corrosion defects on the structural integrity of X52 gas pipelines using the SINTAP procedure and notch theory

On the assessment of U-shaped notches using Failure Assessment Diagrams and the Line Method: Experimental overview and validation

“…Other authors have presented formally similar approaches, with the distance 2L referred to as the "effective distance", which determines the fracture process zone and is defined by the minimum of the relative gradient of the opening stress around the notch [38,39], and the inherent stress (or effective stress) defined as the average value of the stress distribution inside the fracture process zone [38,39].…”

“…If this methodology is compared to the assessment of notches as if they were cracks (a conservative practice), equation (13) produces a reduction of the K r parameter and, consequently, a vertical displacement (downwards) of the assessment point [13,14]. Alternative FAD approaches applied to notch type defects have been proposed in (for example) [38,48,49].…”

Reliability of the High Strength Pipeline Steel under Corrosion Defect

“…Deterministic approaches are based on the safety factor concept and are unable to predict the remaining life of corroded pipelines because the uncertainties are not taken in consideration [3][4][5][6][7]. Figure 1 illustrates the effect of the defect dimension on the security factor.…”

“…(1) The safety margin domain is defined by G(X j ) > 0 and the failure domain is attributed to G(X j ) < 0, where X j are the random variables in the system [3][4][5][6][7][8][9][10]. The assessment of the reliability of the pipeline is summarized to evaluation of the reliability index β.…”

Evaluation of the nocivity of dent and combination of dent and gouge on burst pressure of steel pipe

“…Experimental results have been treated with a semi-local failure criterion denoted "volumetric method" which is based on the notch stress intensity factor concept. This method was developed in LaBPS (Laboratoire de Mécanique Biomécanique Polymere et Structures) [3].…”