BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Peridynamic Modelling of Ice Fracture - Erkan Oterkus (University 
 of Strathclyde)
DTSTART:20171204T160000Z
DTEND:20171204T170000Z
UID:TALK96043@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Despite of its advantages\, utilization of the Arctic region f
 or sailing brings new challenges due to its harsh environment. Therefore\,
  ship structures must be designed to withstand ice loads in case of a coll
 ision between a ship and ice takes place. Although experimental studies ca
 n give invaluable information about ship-ice interactions\, full scale tes
 ts are very costly to perform. Therefore\, computer simulations can be a g
 ood alternative. Ice-structure interaction modelling is a very challenging
  process. First of all\, ice material response depends on many different f
 actors including applied-stress\, strain-rate\, temperature\, grain-size\,
  salinity\, porosity and confining pressure. Furthermore\, macro-scale mod
 eling may not be sufficient to capture the full physical behaviour because
  the micro-scale effects may have a significant effect on macroscopic mate
 rial behaviour. Hence\, it is necessary to utilize a multi-scale methodolo
 gy.&nbsp\;In order to capture the macro-scale behaviour of ice\, well-know
 n Finite Element Method (FEM) has been used in various previous studies. W
 ithin FEM framework\, various techniques can be used to model crack propag
 ation such as cohesive zone models (CZM) and extended finite element metho
 d (XFEM). However\, a universally accepted CZM failure model is not curren
 tly available and the crack propagation may have mesh dependency. Although
 \, the mesh dependency problem can be overcome by XFEM\, enrichment proces
 s may lead to an algebraic system with billions of unknowns which is diffi
 cult to solve numerically. Furthermore\, FEM is based on classical continu
 um mechanics which does not have a length scale parameter and is incapable
  of capturing phenomenon at the micro-scale. Hence\, other techniques shou
 ld be utilized at the micro-scale and linked to FEM simulation. However\, 
 it is not straightforward to obtain a smooth transition between different 
 approaches at different scales.&nbsp\;By taking into account all these cha
 llenging issues\, a state-of-the-art technique\, peridynamics can be utili
 zed for ice fracture modelling. Peridynamics is a non-classical (non-local
 ) continuum mechanics formulation which is very suitable for failure analy
 sis of materials due its mathematical structure. Cracks can occur naturall
 y in the formulation and there is no need to impose an external crack grow
 th law. Furthermore\, due to its non-local character\, it can capture the 
 phenomenon at multiple scales.&nbsp\;<br>
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR