Incorporation of Residual Stress Effects into Fracture Assessments Via the Finite Element Method

S199 Residual Stress Effects on Fatigue Life of Welded Structures Using LEFM

“…For the node n to be located within the actual element equation 10 must be fulfilled. (11) where N i are the shape functions of the 8-noded quadratic isoparametric element. These sets of nonlinear equations are solved using an iterative Newton-Raphson method.…”

“…welded joints [9]. There are several research contributions [2,[10][11][12] on the incorporation of residual stress into the fracture mechanical defect assessment. However, limited work has been done on the development of reliable simulation tool in order to include all these features in the same package.…”

Probabilistic Assessment of a 70-Year Old Pipeline Subject to Seismic Deformation

“…Girth weld residual stresses in large D/t pipes are governed primarily by an axisymmetric bending moment induced by shrinkage in the hoop direction, causing tension at the root and compression at the cap. According to Michaleris et al [7], the total stress intensity due to weld residual stresses acting on a circumferential, internal surface crack ( Q I K ) is best estimated by combining the solution of Gordon, et al [8] with the series solution of Buchalet [9], giving:…”

“…Residual Stresses. It has been shown that in large (>~40) D/t pipes, the magnitude of the tensile residual stress at the root of a girth weld is approximately equal to that of the compressive value measured on the weld cap surface at the same circumferential position [7]. Measurements of this kind had been performed by the aforementioned laboratory using the blind hole drilling (BHD) method at four locations, 90 degrees apart, on each of the four girth welds removed from the pipeline (Figure 7) [12].…”

Θερμομηχανική Ανάλυση Και Πειραματική Διερεύνηση Συγκολλήσεων Χαλύβων Με Μετασχηματισμούς Φάσης.

“…Οι Brust et al [195] στις προσοµοιώσεις που ανέλυσαν έλαβαν υπόψη και τις ανακατανοµές των παραµενουσών τάσεων λόγω της ύπαρξης ρωγµών, χωρίς να µοντελοποιήσουν τη ρωγµή, αλλά χρησιµοποιώντας στοιχεία και δεδοµένα από άλλες πηγές, κυρίως αναλυτικής φύσεως. Επίσης, οι Μichaleris et al [196] µετέφεραν το πεδίο των παραµενουσών τάσεων µιας συγκόλλησης σε ένα δεύτερο µοντέλο, στο οποίο υπήρχε ρωγµή και σηµαντικά βελτιωµένο πλέγµα. Εν συνεχεία, επέτρεψαν στους κόµβους της ρωγµής να µετακινηθούν, µελετώντας έτσι το φαινόµενο της ανακατανοµής των τάσεων.…”