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SUMMARY:GPU-Based Simulations of Fracture in Idealized Brick and Mortar Mi
 crostructures
DTSTART:20140930T131500
DTEND:20140930T141500
DTSTAMP:20260916T043408Z
UID:35893ab091cb33bb2ec4c3d09f2765ecfe601ee6e3be8c6a8bf15af4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Matthew Begley\, Materials and Mechanical Engineering at
  the University of California\, Santa Barbara\, USA\nBio : Matthew R. Begl
 ey is a Professor of Materials and Mechanical Engineering at the Universit
 y of California\, Santa Barbara. Prof. Begley joined UCSB in 2010\, follow
 ing faculty positions at the University of Connecticut (1997-2001) and the
  University of Virginia (2001-2009).  He received his Ph.D. in mechanical
  engineering from UCSB in 1995\, where developed failure prediction codes 
 for fibrous composites\, with an emphasis on high temperature applications
 .  From 1995-1997\, Prof. Begley was a post-doctoral fellow at Harvard Un
 iversity: during this time\, he worked on the thermomechanical performance
  of multilayered systems\, with an emphasis on material behavior at small 
 scales and the reliability of multifunctional coatings.  Professor Begley
 's current research interests are focused on the mechanics of multilayers\
 , 3D printing of multi-phase materials\, and bio-insipred cellular materia
 ls.\nThis talk will describe simulations of fracture in idealized brick an
 d mortar microstructures\, consisting of very stiff bricks bonded together
  with compliant\, ductile mortar.  The objective of the work is to guide 
 the development of ‘synthetic nacres’\, by quantifying connections bet
 ween the composite’s macroscopic behavior\, the brick geometry and stack
 ing hierarchy\, and interface behaviors.  The simulations are generated u
 sing an efficient computational framework that tracks individual brick dis
 placements and rotations and describes brick interactions using a non-line
 ar cohesive law.  The framework is specifically tailored to using graphic
 al processing units (GPUs) to exploit highly parallel computations. A nove
 l incremental Monte-Carlo minimization scheme is used to simulate cracking
  without a priori assumptions of the interaction between crack path and br
 ick arrangement.  Simulations with various brick/interface alignments\, s
 ize distributions\, strength distributions\, etc. are used to quantify the
 ir impact on macroscopic initiation toughness\, strength and modulus.  Th
 e results demonstrate that the fracture toughness and strength are a stron
 g functions of the orientation between microstructural features and loadin
 g direction\, which controls fracture mechanisms observed elsewhere (e.g. 
 splitting\, staircases\, bridging).  Further\,  stochastic distributions
  in constituent properties can have a profound impact on inferred composit
 e (macroscopic) properties\, even though the latter are essentially determ
 inistic. Finally\, the talk will conclude with a brief discussion of the s
 ynthesis such microstructures and present novel results for assembling ord
 ered arrays of microscale bricks using acoustic focusing.
LOCATION:CM 1 4 https://plan.epfl.ch/?room==CM%201%204
STATUS:CONFIRMED
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