Department Seminar of Vladimir Bratov Numerical Models in Wave Mechanics and Dynamic Fracture

School of MechanicalEngineering Seminar

Monday, April 4, 2022 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Numerical Models in Wave Mechanics and Dynamic Fracture

Presenter: Vladimir Bratov

 Institute for Problems in Mechanical Engineering of the     

Russian Academy of Sciences

04 Apr 2022

ABSTRACT:  The presentation will cover several problems related to numerical simulation of dynamic fracture of quasibrittle materials and seismic protection. The results to be presented are based on numerical simulations implementing novel computational techniques and new criteria for fracture and other phase transformations. It will be demonstrated that utilizing the developed approach it is possible to successfully predict initiation, evolution and arrest of dynamic fracture in quasibrittle media loaded by dynamic impact or explosive loads. Other examples will include development of novel seismic protection systems, based on seismic barriers and seismic metamaterials. Utilization of machine learning techniques and generative algorithms (genetic algorithm, particle swarm optimization) for evaluation of optimal geometric shape for seismic protection systems will be also presented and discussed.

BIO: Dr. Vladimir Bratov graduated from St. Peterburg State University, Department of Elasticity year 2000. 2000-2007 he was working at Malmo University Sweden as a PhD student and postdoctoral researcher. He received his PhD degree in 2004 in mechanics of materials. Since 2008 Vladimir Bratov is working at the Institute of Problems in Mechanical Engineering of the Russian Academy of Sciences as a senior researcher. Since 2009 he is teaching several undergraduate and postgraduate courses in Fracture Mechanics and Computational Mechanics at St. Peterburg State University and Peter the Great St. Petersburg Polytechnic University.  2016-2017, as a visiting professor he also worked at Mile East Technical University. Major international collaborations include Keele University, UK, Manchester University, UK, Novo Mesto University, Slovenia, IIT Roorkee, India.  Major references related to this report are:

1. M.K. Khan, M.A. Iqbal, V. Bratov, N.F. Morozov, N.K. Gupta (2020) An investigation of the ballistic performance of independent ceramic target. Thin-Walled Structures, 154 :106784.
2. N.A.Kazarinov, V.A.Bratov, N.F.Morozov, Y.V.Petrov, V.V.Balandin, M.A.Iqbal, N.K.Gupta (2020) Experimental and numerical analysis of PMMA impact fracture. International Journal of Impact Engineering, 143 :103597.
3. V. Bratov, A. Krivtsov (2019) Analysis of energy required for initiation of inclined crack under uniaxial compression and mixed loading. Engineering Fracture Mechanics, 216 :106518
4. V. Bratov , E.N. Borodin (2015) Comparison of dislocation density based approaches for prediction of defect structure evolution in aluminium and copper processed by ECAP. Materials Science and Engineering: A, 631 :10-17.
5. Y.V. Petrov, B.L. Karihaloo, V.A. Bratov (2012) Multi-scale dynamic fracture model for quasi-brittle materials. International Journal of Engineering Science, 61 :3-9
6. V.Bratov (2011) Incubation time fracture criterion for FEM simulations. Acta Mechanica Sinica, 27 (4) :541-549
7. V. Bratov, N. Morozov, Y. Petrov (2009) Dynamic Strength of Continuum. St.-Petersburg University Press

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