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SUMMARY:Strain gradient plasticity: Numerical modeling and fracture assess
 ment - Mr Emilio Martinez Paneda\, PhD candidate at University of Oviedo (
 Spain)
DTSTART:20160318T140000Z
DTEND:20160318T150000Z
UID:TALK67127@talks.cam.ac.uk
CONTACT:Claire Whitaker
DESCRIPTION:Abstract\nExperiments have consistently shown that metallic ma
 terials display strong size effects at the micro and sub-micron scale\, wi
 th smaller being harder. As a result\, a significant body of research has 
 been devoted to model this size-scale dependent plastic phenomenon. At the
  continuum level\, phenomenological strain gradient plasticity (SGP) formu
 lations have been employed to extend plasticity theory to small scales. Gr
 ounded on the physical notion of geometrically necessary dislocations (GND
 s\, associated with non-uniform plastic deformation)\, SGP theories relate
  the plastic work to both strains and strain gradients\, introducing a len
 gth scale in the constitutive equations.\nIn this talk\, particular attent
 ion will be paid to the impact of GNDs in a specific field beyond small-sc
 ale applications: fracture and damage modeling. Thus\, independent of the 
 size of the cracked specimen\, gradient-enhanced modeling of crack tip def
 ormation appears imperative as the plastic zone adjacent to the crack tip 
 is – generally – physically small and contains strong spatial gradient
 s of plastic deformation. By means of different SGP theories and their ad 
 hoc numerical framework\, the influence of GNDs is examined in a wide rang
 e of areas where they are expected to play a major role: crack tip fields 
 characterization\, cohesive zone modeling of crack propagation\, hydrogen 
 diffusion towards the fracture process zone\, environmentally assisted cra
 cking or probabilistic assessment of cleavage fracture\, among others.\n\n
 About the speaker\nEmilio Martínez Pañeda earned a 5 year B. Eng. & M. E
 ng. degree in Industrial Engineering from the University of Oviedo (Spain)
  in 2011 and an MSc degree in Structural Engineering from the University o
 f Granada (Spain) in 2012. He is currently a research engineer and PhD can
 didate at the University of Oviedo working under the supervision of Prof. 
 Betegón. Martínez Pañeda carries out research activities in the fields 
 of mechanics of materials and computational solid mechanics\, with particu
 lar emphasis on the modelization of size effects in metal plasticity and f
 racture and damage assessment. He has held visiting scholar positions at s
 everal Universities such as the Technical University of Denmark (host: C. 
 Niordson)\, the University of Luxembourg (host: S. Bordas) or the Universi
 ty of Cambridge (host: N. Fleck) and he is actively involved in many inter
 national collaborations.\nMartínez Pañeda is currently a member of the E
 uropean Structural Integrity Society (ESIS)\, the European Community on Co
 mputational Methods in Applied Sciences (ECCOMAS) and the International As
 sociation for Computational Mechanics (IACM). He has delivered several inv
 ited talks and seminars in various international conferences and research 
 institutions. He is author or co-author of several scientific publications
  in international referred journals in the field of solid mechanics.\n\n
LOCATION:Department of Engineering - LR6
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