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SUMMARY:On the Multiscale Mechanics of Plasticity and Damage in Magnesium 
 - Padmeya Indurkar\,CUED
DTSTART:20201030T140000Z
DTEND:20201030T143000Z
UID:TALK151738@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Microstructure and stress state closely interact in determinin
 g the strength and fracture resistance of ductile metals. While a fair und
 erstanding of the microstructure-stress interaction on strength\, deformat
 ion stability and damage has been achieved for common engineering alloys\,
  the same is not true for low symmetry hexagonal close packed (HCP) metals
 \, e.g. magnesium (Mg). Mg\, its alloys and composites are promising candi
 dates as lightweight structural metals owing to their high power-to-weight
  ratio. However\, the HCP structure of Mg exhibits complex deformation pro
 cesses resulting in an intrinsic plastic anisotropy and tension-compressio
 n asymmetry at the single crystal scale\, which is pervasive even in polyc
 rystals.\nTo that end\, we probe the effect of textural variability and in
 trinsic plastic anisotropy on the macroscopic load-deformation characteris
 tics of polycrystalline Mg aggregates using crystal plasticity finite elem
 ent modeling (CPFEM). Our analysis underscores the need for a concerted mu
 ltiscale computational effort for improved representation of the micromech
 anics in Mg at the structural length-scales. In this pursuit\, we develop 
 a multi-surface plasticity model (MSM) which embeds the key micromechanica
 l features of plasticity and yet promises an enhanced computational effica
 cy. The MSM is assessed with the 3D datasets generated from a finer scale 
 representation using CPFEM. The MSM is employed to study plastic flow in n
 otched bars and micromechanics of void growth. In conjunction with the CPF
 EM\, application of the MSM enables a multiscale perspective of deformatio
 n and damage evolution in Mg. Extended investigations along this path woul
 d guide development of lightweight and damage-tolerant Mg alloys.\n
LOCATION:zoom 853 4440 7455 - for password email  hh463@cam.ac.uk 
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