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Computational Modelling of Fracture in Brittle, Quasi-Brittle and Ductile Structures – ComFrac

Project title: Computational Modelling of Fracture in Brittle, Quasi-Brittle and Ductile Structures
Project team UL:: Prof. Boštjan Brank, Dr. Andjelka Stanić, Dr. Jaka Dujc, Prof. Jože Korelc, Assoc. Prof. Vlado Stankovski, dr. Nima Dadashzadeh, Blaž Kurent, Marko Lavrenčič
Duration:

36 months

From 1 July 2019 until 30 June 2022

Project code: J2-1722
Lead partner University of Ljubljana, Faculty of Civil and Geodetic Engineering
Project leader at UL: Prof. Boštjan Brank, UL FGG
Partners: There are on other formal partners involved. We informally cooperate with Technical University Braunschweig and Universite de Technologie de Compiegene (Alliance Sorbonne Universite).
Source of finance: Slovenian Research Agency
Key words: material fracture modelling, modelling of outset and propagation of cracks, embedded strong discontinuity finite element modelling, cohesive zone models, fracture process zone, smeared crack models

Description

We research and develop advanced nonlinear numerical methods for simulation of outset and propagation of cracks in quasi-brittle materials (e.g. concrete, stone, masonry, timber and glass) and ductile materials (e.g. metals). We describe degradation of materials in fracture process zone (due to micro effects) with continuum damage and plasticity models. We test different models for description of outset and propagation of macro cracks in solids and structures that belong to either discrete crack or smeared crack approaches (e.g. cohesive zone models and phase field models). Our basic tool for numerical simulations is embedded strong discontinuity finite element method, which we develop for solids and different structural systems. We increase its robustness with novel solutions for efficient numerical implementation. We research combination of nonlinear finite element simulations with probabilistic and identification methods.

Main goals

The main goal is development of robust, accurate and efficient numerical methods for simulation of crack outset and propagation. With these methods, we aim to perform virtual experiments on nonlinear behaviour (up to their complete failures) of small-size and middle-size structural elements. In this way, we target enabling computation of more reliable limit load, limit ductility and failure mechanism of such systems.

Project work packages:

  • (1) Project coordination,
  • (2) Failure modelling of thin-walled (curved) structures,
  • (3) Failure modelling of solids,
  • (4) Failure modelling of reinforced concrete plates,
  • (5) Dissemination of results.

News

https://www.researchgate.net/profile/Bostjan_Brank

http://symech.fgg.uni-lj.si/

References