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SUMMARY:Modelling Brittle Failure of Ice - Kari Kolari (VTT Technical Rese
 arch Centre of Finland)
DTSTART:20171109T160000Z
DTEND:20171109T170000Z
UID:TALK94777@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:The modeling of physics and mechanics of compressive failure i
 s of importance in the ice-structure interaction modelling. Horizontal spl
 itting of ice (termed spalling)\, has been observed in several ice-structu
 re interaction experiments when drifting ice is failed by crushing in the 
 interaction with vertical structure.  <br><br>One of the greatest challeng
 es of material failure analysis is the modelling of brittle failure. Mater
 ials like natural ice and rock are heterogeneous and crystalline\, contain
 ing pores and flaws and other weaknesses. When these materials are subject
 ed to compressive loading in the brittle regime\, they are known to fail b
 y splitting along the loading direction. Formation\, growth and interactio
 n of (micro)cracks due to material inhomogeneities and external force are 
 considered to be the mechanism of brittle failure. <br><br>In this present
 ation\, I will review three approaches applied in the modelling of brittle
  failure of ice: 1) Breakable/cohesive bond model\; 2) Continuum damage me
 chanics (CDM) model\, starting from Helmholz free energy\; 3) WC-CMD-model
 \, where the damage evolution is based on the observed micro-mechanism ter
 med sliding wing crack mechanism. <br><br>The WC-CMD-model predicts axial 
 splitting failure mode of granular ice under uniaxial and biaxial compress
 ion\, and tensile splitting under tension. It also links grain size and st
 rength of granular ice: the model is able to predict Hall-Petch relationsh
 ip between grain diameter and strength\, both under compression and tensio
 n. In addition\, the model predicts experimentally observed increase in co
 mpressive strength with decrease in temperature. <br><br>Related Links<ul>
 <li><a target="_blank" rel="nofollow" href="http://www-old.newton.ac.uk/cg
 i/https%3A%2F%2Fwww.researchgate.net%2Fprofile%2FKari_Kolari%2Fcontributio
 ns">https://www.researchgate.net/profile/Kari_Kolari/contributions</a> - R
 esearchgate</li></ul>
LOCATION:Seminar Room 1\, Newton Institute
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