2026-06-03T05:41:45Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/100742026-02-03T11:08:12Zcom_10630_2254col_10630_37953

Some experimental observations of crack-tip mechanics with displacement data López-Crespo, Pablo Mokhtari, M Moreno-Morales, María Belén Zanganeh, M Materiales - Fatiga In the past two decades, crack-tip mechanics has been increasingly studied with full-field techniques. Within these techniques, Digital Image Correlation (DIC) has been most widely used due to its many advantages, to extract important crack-tip information, including Stress Intensity Factor (SIF), Crack Opening Displacement, J-integral, T-stress, closure level, plastic zone size, etc. However, little information is given in the literature about the experimental setup that provides best estimations for the different parameters. The current work aims at understanding how the experimental conditions used in DIC influence the crack-tip information extracted experimentally. The influence of parameters such as magnification factor, size of the images, position of the images with respect the crack-tip and size of the subset used in the correlation is studied. The influence is studied in terms of SIF and T-stress by using Williams’ model. The concept of determination of the K-dominance zone from experimental data has also explored. In this regard, cyclic loading on a fatigue crack in a compact tension (CT) specimen, made of aluminium 2024-T351 alloy, has been applied and the surface deformation ahead of the crack tip has been examined. The comparison between theoretical and experimental values of KI showed that the effect of subset size on the measured KI is negligible compared to the effect of size of the image. 2015-07-13T12:07:35Z 2015-07-13T12:07:35Z 2015-07-13T12:07:35Z 2015-05-01 journal article M. Mokhtari et alii, Frattura ed Integrità Strutturale, 33 (2015) 143-150; DOI: 10.3221/IGF-ESIS.33.18 http://hdl.handle.net/10630/10074 eng Third IJFatigue & FFEMS Joint Workshop Characterisation of Crack Tip Fields Urbino, Italia 20/04/2015 open access by-nc-nd GIF