Fully coupled thermomechanical model for shape memory alloys accounting for phase transformation, martensitic reorientation, transformation-induced plasticity and fatigue damage
Communication avec acte
Date
2018Résumé
The present work proposes a 3D model, based on the thermodynamical coupling of different strain mechanisms such as the forward and reverse phase transformation, the martensitic reorientation, the transformation-introduced plasticity and the fatigue damage. To achieve this goal, all the above mentioned mechanisms are described through the martensitic volume fraction as the coupling parameter. A recently developed, thermomechanically coupled, SMA constitutive law, including both the phase transformation and martensitic reorientation mechanisms, has been validated under non-proportional loading conditions through a series of comparisons between numerical and experimental results. This model is extended further in order to capture the accumulated TRIP residual strain induced by the martensitic transformation, accounting in addition for the accumulated fatigue damage, which evolves during the cyclic loading. The fatigue damage is incorporated into the constitutive law through the concepts of continuum damage theory. Numerical investigation under strongly non-proportional thermomechanical loading conditions demonstrate the capabilities of the new framework.
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Conférence invitéeCHATZIGEORGIOU, George; CHENG, Long; CHEMISKY, Yves; MERAGHNI, Fodil (Scheven Malte von; Keip Marc-André; Karajan Nils, 2017)Shape memory alloys (SMAs) are exploited in several innovative applications such as biocompatible actuators experiencing up to large number of cyclic loads. However, the description of the SMA cyclic response is still ...
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Conférence invitéeTIKARROUCHINE, El-Hadi; CHATZIGEORGIOU, George; PIOTROWSKI, Boris; CHEMISKY, Yves; PRAUD, Francis; MERAGHNI, Fodil (2017)Dans ce papier, une technique de modélisation multi-échelle (EF2) basée sur le principe d’homogénéisation périodique a été développée pour décrire le comportement des structures composites 3D avec un comportement ...
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Conférence invitéePATOOR, Etienne; MOHARA, Guillaume; CHATZIATHANASIOU, Dimitris; CHEMISKY, Yves; CHATZIGEORGIOU, George; MERAGHNI, Fodil (2016)A transformation criterion that includes the effect of tension-compression asymmetry and texture-induced anisotropy is used to describe the size of the transformation region surrounding the tip of an edge crack in a shape ...
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Conférence invitéeIn this work, a new 3D thermomechanically coupled phenomenological model is proposed for SMAs. SMA behavior is described through several strain mechanisms, each associated with its proper internal variables. Forward and ...
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Article dans une revue avec comité de lectureACHOUR, Nadia; CHATZIGEORGIOU, George; CHEMISKY, Yves; FITOUSSI, Joseph; MERAGHNI, Fodil (Elsevier, 2015)In this work, the phenomenological viscoplastic DSGZ model (Duan et al., 2001 [13]), developed for glassy or semi-crystalline polymers, is numerically implemented in a three-dimensional framework, following an implicit ...