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Title: Crack initiation and propagation in ductile specimens with notches: experimental and numerical study
Authors: Schiavone, Alessandro
Abeygunawardana-Arachchige, Gayan
Silberschmidt, Vadim V.
Keywords: Ductile damage
GTN model
Notched specimens
Finite element
Issue Date: 2016
Publisher: © Springer-Verlag Wien
Citation: SCHIAVONE, A., ABEYGUNAWARDANE-ARACHCHIGE, G. and SILBERSCHMIDT, V.V., 2016. Crack initiation and propagation in ductile specimens with notches: experimental and numerical study. Acta Mechanica, 227(1), pp.203-215.
Abstract: © 2015 Springer-Verlag Wien Failures of components and structures are often related to the presence of notches of different shapes. Damage modelling techniques have been proven capable of modelling the crack initiation and propagation in ductile materials (such as Al alloys). The Gurson–Tvergaard–Needleman (GTN) method and extended finite-element method (XFEM) are compared against original experiments to study the crack initiation and propagation processes in aluminium specimens with different notch shapes (V-shape, U-shape and square). Two regimes are considered in this study: quasi-static and impact uniaxial tensile loading. Results show that the load-bearing capability predicted with the two methods is somewhat lower compared to experiments; still, the crack shapes were predicted correctly, with the exception of the square-notch case, for which XFEM was unable to predict the correct shape due to limitations in the model formulation. This study provides information useful for the design of components with stress raisers that are exposed to different loading regimes and shows limitations in both the GTN- and XFEM-based approaches that in many cases underestimate the load-bearing capacity.
Description: The final publication is available at Springer via http://dx.doi.org/10.1007/s00707-015-1425-0
Version: Accepted for publication
DOI: 10.1007/s00707-015-1425-0
URI: https://dspace.lboro.ac.uk/2134/19460
Publisher Link: http://dx.doi.org/10.1007/s00707-015-1425-0
ISSN: 0001-5970
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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