Experimental evaluation of plasticity-induced crack shielding from crack tip displacements fields
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 33
Abstract
In this work it is proposed a methodology for the evaluation of plasticity-induced crack shielding from the analysis of the crack tip displacements fields measured by digital image correlation. This methodology is based on the evaluation of the stress intensity factors determined from the displacements fields measured at the vicinity of the tip of a growing fatigue crack. For the characterisation of the crack tip displacements field, CJP model has been implemented. This model considers the shielding effects due to plasticity generated during fatigue crack growth. For the purpose of the current work, several fatigue experiments at different R-ratios have been conducted on Al2024-T3 compact tension specimens. In addition, compliance based methods have been adopted to perform a comparison of the results with those obtained by DIC. Results show a good level of agreement, illustrating the enormous potential of DIC technique for the study of fracture mechanics problems.
Authors and Affiliations
J. Vasco-Olmo, F. Diaz
Keywords
Related Articles
- EP ID EP137738
- DOI 10.3221/IGF-ESIS.33.24
- Views 34
- Downloads 0
Tests in tension-torsion conditions with descending sections of strain curve construction
The paper is devoted to theoretical and experimental investigation of materials behavior on postcritical deformation stage (strain softening). Tests results, which confirm theoretical justification of specimen conf...
Ultrasonic fatigue testing device under biaxial bending
A new fatigue testing device has been developed to test specimens under biaxial loading at 20 kHz. A flat smooth specimen with a disc geometry is placed on a torus frame and cyclically loaded at the center of its&...
Mechanical behaviour of wood T-joints. Experimental and numerical investigation
Results of a double-shear single-dowel wood connection tested under monotonic quasi-static compression loading are presented and discussed in this paper. The wood used in this study was a pine wood, namely the Pi...
Modellazione efficiente agli elementi finiti per l’analisi a collasso di strutture incollate complesse
Il lavoro verifica l’applicabilità di un modello semplificato agli elementi finiti per l’analisi a collasso post elastico di strutture incollate complesse in parete sottile. Al fine di superare le limitazioni dei modelli...
Un approccio innovativo per l’analisi quantitativa delle superfici di frattura a fatica nelle ghise sferoidali mediante elaborazione di immagini
Le osservazioni al microscopio elettronico a scansione (SEM) delle superfici di frattura ottenute a seguito di rotture per fatica consentono di evidenziare alcuni meccanismi di avanzamento che dipendono dal materia...