Crack front curvature: Influence and effects on the crack tip fields in bi-dimensional specimens |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;2. Department of Electrical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;3. Center of Excellence in Process and Energy Systems Engineering, Chulalongkorn University, Bangkok 10330, Thailand;4. Bio-Circular-Green-economy Technology & Engineering Center (BCGeTEC), Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;5. School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal 14300, Malaysia;6. Laboratoire des signaux et systèmes, Université Paris-Saclay, CNRS, CentraleSupélec, 91190 Gif-sur-Yvette, France;1. CEMUC, Department of Mechanical Engng, University of Coimbra Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal;2. Department of Civil Engineering, Materials and Fabrication, Málaga University, Escuela de Ingenierías, C/Doctor Ortiz Ramos, s/n, Campus de Teatinos, E-29071 Málaga, Spain;3. CEMUC, Escola Superior de Tecnologia do Instituto Politécnico de Castelo Branco, Av. do Empresário, 6000-767 Castelo Branco, Portugal;4. CEMUC, Depart. of Mechanical Engineering, Polytechnic Institute of Coimbra, 3030-129 Coimbra, Portugal;1. Technische Universität Darmstadt, Materials Mechanics Group, Franziska-Braun-Str. 3, D-64287 Darmstadt, Germany;2. Pontifícia Universidade Católica do Rio de Janeiro, PUC-Rio, Rua Marquês de São Vicente, 225, Gávea, Rio de Janeiro, Brazil;1. CEMUC, Department of Mechanical Engineering, University of Coimbra, Portugal;2. CEMUC, Department of Mechanical Engineering, Polytechnic Institute of Coimbra, 3030-129 Coimbra, Portugal;3. CEMUC, Escola Superior de Tecnologia do Instituto Politécnico de Castelo Branco, Av. do Empresário, 6000-767 Castelo Branco, Portugal |
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| Abstract: | Crack front curvature is evidence in most experimental crack advance test. When classical linear elastic fracture mechanic theory deals with bi-dimensional crack configurations, it ignores the three-dimensional effects of crack propagation. Issues as the influence of the specimen thickness and the crack front curvature are not considered. Previous numerical studies have shed light on out-of-plane plastic zone development or stress state. Nevertheless, these numerical studies are based on the assumption that the crack front is ideally straight; despite it is well known that the crack front has some kind of curvature. In the present work, a CT aluminium specimen has been modelled three-dimensionally and several calculations have been made considering a huge combination of different single load levels, specimen thicknesses and crack front curvatures. Due to the abrupt transition from plane strain to plane stress, an ultrafine mesh along the thickness has been applied. The analysis of the evolution of the plastic zone and the stress state along the thickness provides information about the combined influence of these parameters on fracture mechanics. |
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