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SUMMARY:Multiscale physics-based strategies to address parameter uncertain
 ty in crystal plasticity - Dr Gustavo M Castelluccio\, School of Aerospace
 \, Transport and Manufacturing\, Cranfield University
DTSTART:20181123T140000Z
DTEND:20181123T150000Z
UID:TALK109081@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Most engineering approaches to model the mechanical response o
 f metals rely on correlations between phenomenological formulations and ma
 croscopic experiments\, which area costly and time-consuming. These approa
 ches are reliable for predictions within testing conditions of the experim
 ents used to calibrate the correlation. However\, model fidelity can rapid
 ly decreases when the applied loading conditions depart from those use to 
 calibrate the correlations.\nTo mitigate modelling uncertainty\, the autho
 r presented a crystal plasticity framework [1] in which virtually all para
 meters can be quantified independently at micro- and mesoscales. The key v
 alue added by this approach relies on the low dependence on loading condit
 ions of small scale damage mechanisms. Although the parameterization of sm
 all scale mechanisms is\, in principle\, independent from macroscopic expe
 riments\, the uncertainty of low scale mechanisms is still large and propa
 gates to macroscopic predictions.\nThis presentation will discuss the role
  of physics-based parameters on modelling the cyclic response of FCC metal
 lic materials at low to medium temperatures. We will demonstrate approache
 s to parameterize atomic scale unit processes and mesoscale mechanisms ind
 ependently. We will explore modelling Cu and Ni single crystals under cycl
 ic loading at various temperatures and we will discuss the modelling of hy
 drogen-charged Ni\, for which the dearth of experimental data demands conf
 ident physics-based models. \n\n [1]	Castelluccio and McDowell\, Int. J. P
 last.\, 2017\, 28\, 1.\n\n
LOCATION:Oatley Seminar Room\, Department of Engineering
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