Stanford Mechanics and Computation
(New page: =Tomasz Wierzbicki, Ph.D.= === DUCTILE FRACTURE: Theory, Model Identification and Industrial Applications=== The talk will consist of five parts:(i)Historical note,(ii) Development of th...)
 
(Tomasz Wierzbicki, Ph.D.)
 
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=== DUCTILE FRACTURE: Theory, Model Identification and Industrial Applications===
 
=== DUCTILE FRACTURE: Theory, Model Identification and Industrial Applications===
  
The talk will consist of five parts:(i)Historical note,(ii) Development of the Modified Mohr-Coulomb Fracture criterion,(iii) Multi-axial fracture tests and calibration,(iv) FE implementation and (v) Applications to the automotive,steel, aluminium and offshore industry.
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The talk will consist of five parts:(i)Historical note,(ii) Development of the Modified Mohr-Coulomb Fracture criterion,(iii) Multi-axial fracture tests and calibration,(iv) FE implementation and (v) Applications to the automotive, steel, aluminium and offshore industry.
  
(i)  The developments of the concept of ductile fracture is briefly reviwed from the point of view of author's personal experience in working with the industry.
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(i)  The development of the concept of ductile fracture is briefly reviwed from the point of view of author's personal experience in working with the industry.
  
 
(ii) Ductile fracture is first formulated under proportional loading for
 
(ii) Ductile fracture is first formulated under proportional loading for
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strength steels and aluminium alloys.
 
strength steels and aluminium alloys.
  
(iv) The element delition technique in Abaqus is used to visualise crack paths.  Fracture propagation is assumed to consists of a continuing process of crack initiations with the evolving amount of constraint. For a proper formulation of the post-failure behaviour of elaments, the concept of the material softening is introduced. Such a formulation reduces the mesh size effect and accounts for the mechanics of the process zone near the crack tip.
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(iv) The element delition technique in Abaqus is used to visualize crack paths.  Fracture propagation is assumed to consists of a continuing process of crack initiations with the evolving amount of constraint. For a proper formulation of the post-failure behavior of elements, the concept of the material softening is introduced. Such a formulation reduces the mesh size effect and accounts for the mechanics of the process zone near the crack tip.
  
(v) A driving force of most of the work on ductile fracture have been several
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(v) A driving force of most of the work on ductile fracture has been several
industrial consortia organised by the author at MIT. Applications to real world fracture problems will be presented along with a comparison between the tests and simulations.
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industrial consortia organized by the author at MIT. Applications to real world fracture problems will be presented along with a comparison between the tests and simulations.

Latest revision as of 14:45, 12 October 2009