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DTSTAMP:20210916T132451Z
LOCATION:Michel Mayor
DTSTART;TZID=Europe/Stockholm:20210707T143000
DTEND;TZID=Europe/Stockholm:20210707T150000
UID:submissions.pasc-conference.org_PASC21_sess150_msa331@linklings.com
SUMMARY:Micromechanics of Ductile Damage in a Non-Schmid Material
DESCRIPTION:Minisymposium\n\nMicromechanics of Ductile Damage in a Non-Sch
 mid Material\n\nBronkhorst, Cho, Anghel, Marcy, Vander Wiel...\n\nAccurate
 ly representing the process of porosity-based ductile damage in polycrysta
 lline metallic materials via computational simulations remains a significa
 nt challenge. The heterogeneity of deformation in this class of materials 
 due to the anisotropy of deformation creates the conditions for the format
 ion of a damage field. A technique of soft-coupled linkage between a macro
 -scale damage model and micro-mechanical calculations of a suite of polycr
 ystal realizations of a representative BCC tantalum with non-Schmid effect
 s is presented. The macro-scale model, which accounts for rate-dependence 
 and micro-inertial effects in the material, was used to represent two plat
 e impact experiments and predict the point in time in the loading profile 
 when porosity is initiated. A micro-mechanical model is employed in perfor
 ming of polycrystal calculations of statistically representative microstru
 ctures of the tantalum material subjected to the extreme loading condition
 s informed from the macro-scale calculations. This enables to provide loca
 l-scale stress conditions for porosity initiation within the polycrystalli
 ne network. The results suggest that the non-Schmid effects significantly 
 influence the local stress conditions across grain boundaries and triple j
 unctions and stress at grain boundaries depend upon orientation of each bo
 undary with respect to the shock direction. Results also suggest that the 
 von Mises stress and triaxiality at the grain boundaries and the grain bou
 ndary triple lines are highly variable but the variability is diminished w
 ith distance to the grain center.\n\nDomain: CS and Math, Chemistry and Ma
 terials, Physics, Engineering
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