Santosh Kakarla’s PhD thesis defense

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Santosh Kakarla’s PhD thesis defense

19 06 2020 @ 14 h 00 min - 16 h 30 min

Santosh Kakarla will publicly defend her PhD thesis entitled :

“From anisotropic damage to multiple cracks by coupling a microplane model and a strong discontinuity formulation in the Embedded Finite Element Method”

Friday 19 June 2020 at 2pm

Video conference with the ‘Blackboard Collaborate’ application (see below “Connection Details)




The performance aspects of large scale civil engineering structures like containment facilities such as durability, serviceability and structural safety are assessed from time to time to avert any catastrophes. Also, in the cases of extreme loading, different cracking mechanisms contribute to each other ultimately leading to the failure. This creates the need for devising certain regulatory measures. In order to achieve this, it is essential to predict the information like crack opening displacements, crack spacing and tortuosity. The purpose of this thesis is to develop numerical tools to model multiple intersecting cracks. In particular, the complete strain localization process from the onset of damage to the initiation and propagation of multiple cracks. Two main ingredients are used. The microplane model allows to describe the anisotropic damage phase and Embedded Finite Element Method (EFEM) introduces cracks as multiple strong discontinuities in the damaged continuum. First, the standard EFEM is extended in the context of multiple cracks. Later, the microplane microdamage model is formulated in a thermodynamic framework using simple constitutive laws. Finally, these two approaches are coupled using a transition methodology. The proposed methodologies are illustrated using several elementary and structural test cases that involve complex stress-strain states.

Jury composition

Pr Jean Baptiste COLLIAT, Professeur, Université de Lille – Reporter
Pr Panagiotis KOTRONIS, Professeur, EC Nantes – Reporter
Pr Delphine BRANCHERIE, Professeure, UTC Compiègne – Reviewer
Dr Ludovic JASON, Ingénieur chercheur HDR, CEA – Reviewer
Pr Frédéric RAGUENEAU, Professeur, ENS Paris-Saclay – Reviewer
Dr Cédric GIRY, Maître de conférences, ENS Paris-Saclay – Thesis Advisor & Reviewer
Dr Giuseppe RASTIELLO, Ingénieur chercheur, CEA – Thesis Advisor & Reviewer
Dr Benjamin RICHARD, Chef de Laboratoire HDR, IRSN – Thesis Director

Connection Details

The following virtual rooms are dedicated for testing and defense purposes: 

  1. virtual room for testing: this room is already accessible

  1. virtual room for defense: this room is accessible from 1.30pm on the 19/06/2020,


19 06 2020
14 h 00 min - 16 h 30 min
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