Assistant Professor – Department of Mechanical Engineering, University of West Attica [full CV]

Research and interests

• Applied and Computational Mechanics
• Nanocomposite structures
• Extended Finite Elements Method (X-FEM)
• Multiscale simulation
• Advanced nonlinear computational algorithms

Education

• Postdoctoral studies in Computational Mechanics, Aristotle University of Thessaloniki – School of Civil Engineering, Greece.
• Postdoctoral studies in Computational Mechanics, NTUA – School of Civil Engineering, Greece.
• D. Mechanics, NTUA – School of Civil Engineering, Greece.
• Sc. Applied Mechanics, NTUA – School of Applied Mathematical and Physical Sciences, Greece.
• Sc. Computational Mechanics, NTUA – School of Chemical Engineering, Greece.
• Sc. Marine Technology and Science, NTUA – School of Naval Architecture and Marine Engineering, Greece.
• Eng. Mechanical Engineering, Aristotle University of Thessaloniki – School of Mechanical Engineering, Greece.

Publications

Papers in Scientific Journals

• P. Gavallas, G. Stefanou, D. Savvas, C. Mattrand, J. M. Bourinet, “CNN-based prediction of microstructure-derived random property fields of composite materials”, Computer Methods in Applied Mechanics and Engineering, 430 (2024) 117207.
• P.Gavallas, D. Savvas, G. Stefanou, “Mechanical properties of graphene nanoplatelets containing random structural defects”, Mechanics of Materials, 180, (2023) 104611.
• G. Stefanou, D. Savvas, P. Gavallas, I. Papaioannou, “The effect of random field parameter uncertainty on the response variability of composite structures”, Composites Part C: Open Access, (2022) 100324.
• G. Stefanou, D. Savvas, P. Metsis, “Random Material Property Fields of 3D Concrete Microstructures Based on CT Image Reconstruction”, Materials, 14.6 (2021) 1423.
• D. Savvas, I. Papaioannou, G. Stefanou, ”Bayesian identification and model comparison for random property fields derived from material microstructure”, Computer Methods in Applied Mechanics and Engineering, 365 (2020) 113026.
• D. Savvas, G. Stefanou, ”The Effect of Material and Geometrical Uncertainty on the Homogenized Properties of Graphene Sheet-Reinforced Composites”, ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems Part B: Mechanical Engineering, Volume 5(3), 2019.
• D. Savvas, G. Stefanou, ”Determination of random material properties of graphene sheets with different types of defects”, Composites Part B: Engineering, Volume 143, p. 47 – 54, 2018.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Stochastic finite element analysis of composite structures based on mesoscale random fields of material properties”, Computer Methods in Applied Mechanics and Engineering, Volume 326, p. 319 – 337, 2017.
• D. Savvas, G. Stefanou, ”Assessment of the effect of microstructural uncertainty on the macroscopic properties of random composite materials”, Journal of Composite Materials, Volume 51(19), p. 2707 – 2725, 2016.
• D. Savvas, G. Stefanou, V. Papadopoulos, M. Papadrakakis, ”Effect of waviness and orientation of carbon nanotubes on random apparent material properties and RVE size of CNT reinforced composites”, Composite Structures, Volume 152, p. 870-882, 2016.
• D. Savvas, G. Stefanou, M. Papadrakakis, ”Determination of RVE size for random composites with local volume fraction variation”, Computer Methods in Applied Mechanics and Engineering, Volume 305, p. 340-358, 2016.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Stochastic finite element analysis of composite structures based on material microstructure”, Composite Structures, Volume 132, p. 384-392, 2015.
• D. Savvas, G. Stefanou, M. Papadrakakis, G. Deodatis, ”Homogenization of random heterogeneous media with inclusions of arbitrary shape modeled by XFEM”, Computational Mechanics, Volume 54, p. 1221-1235, 2014.
• D. Savvas, V. Papadopoulos, ”Nonlinear multiscale homogenization of carbon nanotube reinforced composites with interfacial slippage”, International Journal of Multiscale Computational Engineering, Volume 12, p. 271-289, 2014.
• D. Savvas, V. Papadopoulos, M. Papadrakakis, ”The effect of interfacial shear strength on damping behavior of carbon nanotube reinforced composites”, International Journal of Solids and Structures, Volume 49, p. 3823-3837, 2012.

Papers in Conference Proceedings

• G. Stefanou, D. Savvas, P. Gavalas, I. Papaioannou, “Response statistics of composite structures with stochastic material properties based on microstructure”, 30th International Conference on Noise and Vibration Engineering, ISMA2022– 9th Uncertainty in Structural Dynamics, USD2022, Leuven, Belgium, September 12-14, 2022.
• P. Gavalas, D. Savvas, G. Stefanou, “A Multiscale Computational Framework for the Simulation of Graphene Nanoplatelets”, 15th World Congress on Computational Mechanics & 8th Asian Pacific Congress on Computational Mechanics, WCCM-APCOM 2022, Yokohama, Japan, July 31 -August 5, 2022.
• G. Stefanou, D. Savvas, I. Papaioannou, P. Gavalas, “Response variability of composite structures with random spatially varying material properties”, 8^th European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS Congress 2022, Oslo, Norway, June 5-9, 2022.
• D. Savvas, G. Stefanou, P. Metsis, “Determination of random apparent material properties of concrete based on CT image reconstruction”, 4th International Conference on Uncertainty Quantification in Computational Sciences and Engineering, UNCECOMP2021, Athens, Greece, June 28-30, 2021.
• G. Stefanou, D. Savvas, I. Papaioannou, “Parameter identification of the random apparent material properties of two-phase composites in a Bayesian framework”, 4th International Conference on Uncertainty Quantification in Computational Sciences and Engineering, UNCECOMP2021, Athens, Greece, June 28-30, 2021.
• D. Savvas, I. Papaioannou, G. Stefanou, “Bayesian identification of mesoscale random fields based on material microstructure”, 14th World Congress in Computational Mechanics, WCCM, ECCOMAS Congress, Paris, France, July 19-24, 2020.
• D. Savvas, G. Stefanou, M. Papadrakakis, ”Effective properties of random graphene sheet reinforced composites”, 3rd International Conference on Uncertainty Quantification in Computational Sciences and Engineering, UNCECOMP2019, June 24-26, 2019, Crete, Greece.
• D. Savvas, G. Stefanou, ”Homogenization of Random Graphene Sheet Reinforced Composites”, 27th International Conference on Composites/Nano Engineering, ICCE, July 14-20, 2019, Granada, Spain.
• D. Savvas, G. Stefanou, ”Homogenization of graphene sheet reinforced composites considering material and geometrical uncertainty”, 9th International Conference on Computational Methods ,ICCM, August 6-10, 2018, Rome, Italy.
• D. Savvas, G. Stefanou, ”An efficient computational procedure for the determination of the stochastic mechanical properties of defective graphene sheets”, 13th World Congress in Computational Mechanics, WCCM, July 22-27, 2018, New York City, United States.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Mesoscale random fields for the apparent material properties of random microstructures”, 9th International Congress on Computational Mechanics ,GRACM, Greece, June 4-6, 2018, Chania, Crete.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Response variability of composite structures with mechanical properties derived from material microstructure”, 12th International Conference on Structural Safety & Reliability, August 6-10, 2017 Vienna, Austria.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Generation of random material property fields based on microstructure”, 2nd International Conference on Uncertainty Quantification in Computational Sciences and Engineering, June 15-17, 2017, Rhodes Island, Greece.
• D. Savvas, G. Stefanou, ”Homogenization of composite materials considering different types of microstructural uncertainty”, 2nd International Conference on Uncertainty Quantification in Computational Sciences and Engineering, , June 15-17, 2017, Rhodes Island.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Determination of mesoscale random fields and RVE size of spatially random composites”, Engineering Mechanics Institute (EMI) International Conference, Metz, France, October 25-27, 2016.
• D. Savvas, G. Stefanou, ”Homogenization of two-phase composites with random material properties”, EUROMECH COLLOQUIUM 584, Multi-uncertainty and multi-scale methods and related applications, September 14-16, 2016 Porto, Portugal.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Determination of the apparent properties and RVE size of spatially random composites”, ”, EUROMECH COLLOQUIUM 584, Multi-uncertainty and multi-scale methods and related applications, September 14-16, 2016 Porto, Portugal.
• D. Savvas, G. Stefanou, V. Papadopoulos, M. Papadrakakis, ”Determination of RVE size for random CNT reinforced composites”, Proc. of the 7th European Congress on Computational Methods in Applied Science and Engineering ECCOMAS Congress, June 5-10, 2016, Crete, Greece.
• D. Savvas, G. Stefanou, ”Determination of mesoscale random fields for the apparent properties of spatially random composites”, Proc. of the 7th European Congress on Computational Methods in Applied Science and Engineering ECCOMAS Congress, June 5-10, 2016, Crete, Greece.
• G. Stefanou, D. Savvas, ”An efficient approach for the determination of the apparent properties and RVE size of spatially random composites”, Proc. of the 11th HSTAM International Congress on Mechanics, May 27-30, 2016 Athens, Greece.
• G. Stefanou, D. Savvas, ”Stochastic finite elements based on material microstructure”, Proc. Of the 13th International Probabilistic Workshop (IPW2015), 4-6 November 2015, Liverpool, UK.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”The role of microstructure uncertainty in stochastic finite element analysis”, Proc. of the 8th International Congress on Computational Mechanics ,GRACM, 12-15 July 2015, Volos, Greece.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”Effective properties of random microstructures as a basis for stochastic finite element analysis”, Proc. of the 1st International Conference on Uncertainty Quantification in Computational Sciences and Engineering .UNCECOMP 2015, 25-27 May 2015, Crete, Greece.
• G. Stefanou, D. Savvas, M. Papadrakakis, ”The influence of inclusion shape on the effective properties of random nanocomposites”, Proc. of the International Conference on Advances in Composite Materials and Structures, CACMS 2015, April 13-15, 2015, Istanbul, Turkey.
• G. Stefanou, D. Savvas, M. Papadrakakis, G. Deodatis, ”Effective properties of two-phase random media modeled by XFEM”, Proc. of the 11th World Congress on Computational Mechanics (WCCM), July 20-25, 2014, Barcelona, Spain.
• G. Stefanou, D. Savvas, M. Papadrakakis, G. Deodatis, ”Homogenization of random heterogeneous media with inclusions of arbitrary shape”, Proc. of the IUTAM Symposium on ”Multiscale modeling and uncertainty quantification of materials and structures”, September 9-11, 2013, Santorini, Greece.
• V. Papadopoulos, D. Savvas, ”Multiscale modeling of damping in carbon nanotube reinforced composites”, Proc. of the 10th HSTAM International Congress on Mechanics, May 25-27, 2013, Chania, Crete Island, Greece.
• D. Savvas, V. Papadopoulos, ”Characterization of carbon nanotube reinforced thermoplastics using hierarchical multiscale simulation”, Proc. of the 10th HSTAM International Congress on Mechanics, Chania, Crete Island, Greece, May 25-27, 2013.
• D. Savvas, V. Papadopoulos, M. Papadrakakis, O. Kokkinos, ”Stochastic characterization of the waviness of carbon nanotubes and its effect on the mechanical properties of nanocomposites”, Proc. of the 10th World Congress on Computational Mechanics ,WCCM, July 8-13, 2012, Sao Paulo, Brazil.
• D. Savvas, V. Papadopoulos, M. Papadrakakis, ”The effect of random waviness of carbon nanotubes on the mechanical and damping properties of nanocomposites”, Proc. of the 6th European Congress on Computational Methods in Applied Science and Engineering, ECCOMAS, September 10-14, 2012, Vienna, Austria.

Book Chapters

• G. Stefanou, D. Savvas, M. Papadrakakis, G. Deodatis. Homogenization of random heterogeneous media with inclusions of arbitrary shape, ”Multiscale Modeling and Uncertainty Quantification of Materials and Structures”, pp. 85-99, Springer (2014).
• D. Savvas, V. Papadopoulos, M. Papadrakakis. Mechanical performance of carbon nanotube reinforced composites under cyclic loading, ”A book dedicated to Bernhard A. Schrefler”, Bytes and Science (2012).