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dc.contributor.authorZhu, Cheng
dc.contributor.authorPouya, Amade
dc.contributor.authorArson, Chloé
dc.date.accessioned2016-09-12T14:25:52Z
dc.date.available2016-09-12T14:25:52Z
dc.date.issued2016-09
dc.identifier.citationC. Zhu, A. Pouya, C. Arson, 2016. Prediction of viscous cracking and cyclic fatigue of salt polycrystals using a joint-enriched Finite Element Model, Mechanics of Materials (accepted). DOI: http://dx.doi.org/10.1016/j.mechmat.2016.09.004en_US
dc.identifier.urihttp://hdl.handle.net/1853/55810
dc.description© 2016 Elsevier Ltd.en_US
dc.description.abstractWe present a new Joint-enriched Finite Element Method (JFEM) to predict viscous damage and fatigue in halite polycrystals in 2D. Different visco-plastic finite elements are used to represent grains of different orientations, and joint elements are used for modeling crack propagation. Simulations of uniaxial creep tests show that, as it could be predicted theoretically, viscous shear deformation in grains causes geometric incompatibilities. Numerical results also show that the transition between secondary and tertiary creep corresponds to inter-granular crack coalescence. The JFEM model captures the mechanical behavior of halite under cyclic loading, mainly: (a) Higher stress amplitude, lower confining stress, and lower loading frequency increase deformation and damage; (b) The polycrystal’s Young’s modulus decreases exponentially with the number of cycles; (c) The behavior is similar for different loading directions. Simulations with intra- and inter- granular joint elements show that most stress concentrations occur in intra-granular joints where several angular grains are in contact. Results of creep tests obtained with the JFEM are compared to those obtained with an inclusion-matrix model that accounts for damage accommodation due to grain breakage. Both the JFEM and inclusion-matrix models are calibrated against experimental creep tests to: (a) Produce a Young’s modulus of 23 GPa for the polycrystal; (b) Match secondary creep strain rates; (c) Match the time of tertiary creep initiation. In the inclusion-matrix model, the absence of grain geometric rearrangement results in a brutal failure just after the first grain breakage that triggers tertiary creep. Moreover, the JFEM model highlights the development of crack patterns upon viscous deformation. The JFEM is of great promise to understand complex phenomena of viscous accommodation coupled with grain interface debonding.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectMicro-scale cracksen_US
dc.subjectSalt rocken_US
dc.subjectSalt polycrystalen_US
dc.subjectSelf-consistent methoden_US
dc.subjectFinite element methoden_US
dc.subjectCreep testen_US
dc.subjectCyclic loadingen_US
dc.titlePrediction of viscous cracking and cyclic fatigue of salt polycrystals using a joint-enriched Finite Element Modelen_US
dc.typePost-printen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Civil and Environmental Engineeringen_US
dc.contributor.corporatenameUniversité Paris-Est. Labortoire Navieren_US
dc.identifier.doihttp://dx.doi.org/10.1016/j.mechmat.2016.09.004en_US


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