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
References
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LAVRENČIČ, Marko, BRANK, Boštjan. Hybrid-mixed shell quadrilateral that allows for large solution steps and is low-sensitive to mesh distortion. Computational mechanics, ISSN 0178-7675, 2020, letn. 65, št. 1, str. 177-192, ilustr. https://link.springer.com/content/pdf/10.1007%2Fs00466-019-01759-3.pdf, doi: 10.1007/s00466-019-01759-3. [COBISS.SI-ID 8875617]
- STANIĆ, Andjelka, BRANK, Boštjan, BRANCHERIE, Delphine. Fracture of quasi-brittle solids by continuum and discrete-crack damage models and embedded discontinuity formulation. Engineering fracture mechanics, ISSN 1873-7315, 2020, letn. 227, 15. marec/106924, str. 1-26, ilustr. https://doi.org/10.1016/j.engfracmech.2020.106924, https://repozitorij.uni-lj.si/IzpisGradiva.php?id=114377&lang=slv, doi: 10.1016/j.engfracmech.2020.106924. [COBISS.SI-ID 9088609]
- BRANK, Boštjan, VELDIN, Tomo, LAVRENČIČ, Marko, BROJAN, Miha. A comparison of computational models for wrinkling of pressurized shell-core systems. International journal of non-linear mechanics, ISSN 0020-7462. [Print ed.], 2020, letn. , št. , str. 1-24, ilustr. https://doi.org/10.1016/j.ijnonlinmec.2020.103611, doi: 1016/j.ijnonlinmec.2020.103611. [COBISS.SI-ID 29398019], [JCR, SNIP, Scopusdo 13. 10. 2020: št. citatov (TC): 0, čistih citatov (CI): 0, čistih citatov na avtorja (CIAu): 0]
ARRS, J2-1722, Numerično modeliranje porušitve v krhkih, kvazi-krhkih in duktilnih konstrukcijah -
DUJC, Jaka, BRANK, Boštjan. Modeling fracture in elasto-plastic solids by embedded-discontinuity stress-hybrid finite element formulation. Mechanics of advanced materials and structures, ISSN 1537-6494. [Print ed.], 2020, letn. , št. , str. 1-17, ilustr. https://doi.org/10.1080/15376494.2020.1786755, doi: 1080/15376494.2020.1786755. [COBISS.SI-ID 23001859], [JCR, SNIP, WoSdo 24. 7. 2020: št. citatov (TC): 0, čistih citatov (CI): 0, čistih citatov na avtorja (CIAu): 0, Scopus do 22. 9. 2020: št. citatov (TC): 0, čistih citatov (CI): 0, čistih citatov na avtorja (CIAu): 0]
financer: ARRS, J2-1722, Numerično modeliranje porušitve v krhkih, kvazi-krhkih in duktilnih konstrukcijah, ComFrac
- LAVRENČIČ, Marko, BRANK, Boštjan. Comparison of numerically dissipative schemes for structural dynamics – generalized-alpha versus energy-decaying methods. Thin-walled structures, ISSN 0263-8231, dec. 2020, letn. 157, št. 107075, str. 1-22, ilustr. https://doi.org/10.1016/j.tws.2020.107075,https://repozitorij.uni-lj.si/IzpisGradiva.php?id=120701, doi: 1016/j.tws.2020.107075. [COBISS.SI-ID 29701379], [JCR, SNIP, Scopus do 4. 10. 2020: št. citatov (TC): 0, čistih citatov (CI): 0, čistih citatov na avtorja (CIAu): 0]
financer: ARRS, J2-1722, Numerično modeliranje porušitve v krhkih, kvazi-krhkih in duktilnih konstrukcijah, ComFrac