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SUMMARY:Generalized Grain Cluster Method for Multiscale Modelling of Micro
 structures - Professor Akke Suiker\, Technische Universiteit Eindhoven
DTSTART:20141017T130000Z
DTEND:20141017T140000Z
UID:TALK54794@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:The development of new multiphase steels with enhanced mechani
 cal properties requires examining their response behavior by means of adva
 nced numerical models that accurately account for complex microstructural 
 characteristics. Direct numerical simulations (DNS) at the microscale\, to
 gether with an appropriate averaging scheme\, lead to a consistent scale t
 ransition for determining the overall behavior at the macroscopic scale. H
 owever\, performing a DNS is often computationally expensive\, which limit
 s its applicability. A computationally less expensive approximate method\,
  termed the Generalized Grain Cluster Method (GGCM)\, is proposed as an al
 ternative. The GGCM relies on a set of simplifying assumptions for the dis
 tribution of the deformation field inside a grain while at the same time i
 t minimizes the effect of discontinuities arising from the kinematical ass
 umptions. This method allows studying an aggregate of grains with arbitrar
 y polyhedral shapes. A benchmark for the proposed multiscale framework is 
 constructed by performing a set of DNSs on polycrystalline samples compose
 d of multiple austenitic and ferritic grains (TRIP-steel). The mechanical 
 response of the austenitic grains is computed by means of an elastoplastic
 -transformation model whereas a crystal-plasticity model for BCC lattices 
 is used to simulate the elastoplastic deformations in the ferritic grains.
  Polycrystalline samples of increasing size are used to identify a represe
 ntative volume element for the numerical homogenization procedure. The sam
 e set of samples is analyzed using the direct numerical simulations and th
 e Generalized Grain Cluster Method. The macroscopic responses derived from
  these homogenization schemes are compared and the accuracy and numerical 
 efficiency of the proposed method is pointed out.
LOCATION:Oatley Seminar Room\, Department of Engineering
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