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SUMMARY:Modelling of Explosively Driven Fragmentation Metals - Professor  
 Rade Vignjevic  FRAeS\,  Applied Mechanics and  Astronautics Department\, 
 School of Engineering\, Cranfield University
DTSTART:20120525T130000Z
DTEND:20120525T140000Z
UID:TALK37788@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:Topics: Constitutive model - Orthotropic Elasticity\, Plastici
 ty and Damage\; SPH representation of damage\; Mock-Holt experiment\nIn or
 der to accurately predict explosively driven fragmentation of metals it is
  necessary to have a good constitutive model and spatial discretisation te
 chnique which is capable of representing this process. This presentation d
 escribes on-going research on the development of a constitutive model for 
 metals and the Total Lagrangian smooth particle hydrodynamics (TL-SPH) met
 hod and their application to modelling of fragmentation of metallic rings 
 and cylinders.\nThe presented outlines the main aspects of the new materia
 l model for orthotropic metals and the approach to representing damage in 
 TL-SPH developed at Cranfield. The use of this formulation has the advanta
 ge of eliminating two drawbacks of the traditional SPH formulation with an
  Eulerian interpolation kernel: tensile instability and numerical fracture
 .\nNumerical examples used to validate the developments include Mock Holt 
 experiment (shown in Figure 1) and fragmentation of metallic cylinders wit
 h more complex geometry. The modelling approach was able to reproduce the 
 sizes and numbers of fragments observed in the experiments.
LOCATION:Oatley Seminar Room\, Department of Engineering
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