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SUMMARY:On accounting for quasi-brittle fiber damage in computational homo
 genization of UD-composites - Dr Konstantinos Poulios\, Technical Universi
 ty of Denmark
DTSTART:20181019T130000Z
DTEND:20181019T140000Z
UID:TALK107944@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Unidirectionally reinforced composite materials often employ a
  stiff but brittle reinforcement embedded in a comparably compliant but du
 ctile matrix. Although the material micro-structure is normally at a signi
 ficantly lower length scale compared to the component dimensions\, the sep
 aration of scales assumption is not always a valid one. This is for exampl
 e the case when studying the formation of kink-bands inside a larger compo
 nent. In such cases\, in order to avoid a computationally prohibitive expl
 icit discretization of the micro-structure\, appropriate high fidelity com
 putational homogenization methods have to be developed.\n\nMost of the ava
 ilable homogenization methods aim at representing materials with a micro-s
 tructure exclusively relying on a displacement field valid at the macro-sc
 ale. A different approach is to use additional kinematic variables for cap
 turing more accurately the kinematic behavior of the micro-structure. In t
 he past\, a micro-rotation variable corresponding to the Cosserat continuu
 m theory was used in addition to the homogenized displacements field in or
 der to account for the bending stiffness of the reinforcing fibers in UD c
 omposites. Pushing this concept further\, in the present work we employ a 
 number of additionally kinematic variables in order to obtain an even rich
 er representation of deformations in the micro-structure. In its most adva
 nced variant the model can capture the occurrence of quasi-brittle fractur
 e in the fibers due to bending. The level of fidelity of the method is dem
 onstrated by comparing its results to simulations with an explicit discret
 ization of the micro-structure.
LOCATION:Oatley Seminar Room\, Department of Engineering
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