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George Zino Voyiadjis (born 1946) is a American civil engineer, Boyd Professor at the Louisiana State University in the Department of Civil and Environmental Engineering. He specializes in Mechanics of materials, Damage mechanics^[1], and Multiscale modeling.

Voyiadjis was born in Cairo, Egypt, the younger son of Greek Cypriot parents. He obtained his B.Sc. in civil engineering in 1969 from Ain Shams University with First Degree Honors on top of his class. He went on to pursue a M.Sc. in civil engineering in 1970 from California Institute of Technology. He obtained his D.Eng.Sc. in engineering mechanics in 1973 from Columbia University by working with Maciej P. Bieniek.

From 1973 to 1975, he worked as a Senior Stress Analyst with Nuclear Power Services, Inc. and Ebasco Services Inc. in New York, NY. His academic career began in 1975 when he took an assistant professor position in the Department of Civil Engineering at the University of Petroleum and Minerals (UPM), currently renamed to King Fahd University of Petroleum and Minerals (KFUPM), in Dhahran, Saudi Arabia and was promoted to an associate professor in 1980. He joined the Department of Civil and Environmental Engineering at Louisiana State University (LSU), Baton Rouge, LA in 1980 as an assistant professor and was promoted to an associate professor with tenure in 1985 and full professor in 1990. He is currently the Boyd Professor, which is the highest professorial rank awarded by the LSU system. He has been the Chair of the Department of Civil and Environmental Engineering of LSU since March of 2001. He also served from 1992 to 1994 as the Acting Associate Dean of the graduate school.

Over sixty two graduate students (37 Ph. D.) completed their degrees under his direction. He has also supervised numerous postdoctoral associates. Voyiadjis has been extremely successful in securing more than $30.0 million in research funds as a principal investigator/investigator from the National Science Foundation, the Department of Defense, the Air Force Office of Scientific Research, the Department of Transportation, National Oceanic and Atmospheric Administration (NOAA), and major companies such as IBM and Martin Marietta.

Voyiadjis’ primary research interest is in plasticity and damage mechanics of metals, metal matrix composites, polymers and ceramics with emphasis on the theoretical modeling, numerical analysis of material behavior, and experimental correlation. Research activities of particular interest encompass macro-mechanical and micro-mechanical constitutive modeling, experimental procedures for quantification of crack densities, inelastic behavior, thermal effects, interfaces, damage, failure, fracture, impact, and numerical modeling.

His research has been performed on developing numerical models that aim at simulating the damage and dynamic failure response of advanced engineering materials and structures under high-speed impact loading conditions. This work will guide the development of design criteria and fabrication processes of high performance materials and structures under severe loading conditions. Emphasis is placed on survivability area that aims to develop and field a contingency armor that is thin and lightweight, but with a very high level of an overpressure protection system that provides low penetration depths. The formation of cracks and voids in the adiabatic shear bands, which are the precursors to fracture, are mainly investigated.

Voyiadjis has been invited to give plenary presentations and keynote lectures in many countries around the world. He has also been invited as guest editor in numerous volumes of the Journal of Computer Methods in Applied Mechanics and Engineering, International Journal of Plasticity, Journal of Engineering Mechanics of the ASCE, and Journal of Mechanics of Materials. These special issues focus in the areas of damage mechanics, structures, fracture mechanics, localization, and bridging of length scales.

• On the International Advisory Board of the Engineering Transactions (formerly Rozprawy Inzynierskie founded in 1952), 2012-present.
• On the Editorial Advisory Board of the Journal of Nanotechnology in Engineering and Medicine, 2011-present.
• On the Editorial Advisory Board of the Journal of Surfaces and Interfaces of Materials, 2009-present.
• Associate Editor of the Journal of Aerospace Engineering (JAE), ASCE, 2009-present.
• Chief Editor of the Journal of Nanomechanics and Micromechanics (JNMM), ASCE, 2008-2014.
• On the Editorial Advisory Board of the International Journal of Damage Mechanics, 2007-present.
• Member of the Editorial Board of theJordan Journal of Civil Engineering (JJCE), 2006-present.
• Associate Editor of the Journal of Engineering Mechanics, ASCE, 1997-1999, 2005-present.
• On the Editorial Advisory Board of the International Journal of Plasticity, 1995-present.

Voyiadjis is a Member of the European Academy of Sciences and Arts^[2], and Foreign Member of both the Polish Academy of Sciences, Division IV (Technical Sciences) and the National Academy of Engineering of Korea (한국공학한림원, NAEK). He is the recipient of the 2008 Nathan M. Newmark Medal of the American Society of Civil Engineers and the 2012 Khan International Medal for outstanding life-long Contribution to the field of Plasticity. He was also the recipient of the Medal for his significant contribution to Continuum Damage Mechanics, presented to him during the Second International Conference on Damage Mechanics (ICDM2), Troyes, France July, 2015. This is sponsored by the International Journal of Damage Mechanics and is held every three years.

Voyiadjis was Honored in April of 2012 by the International Symposium on “Modeling Material Behavior at Multiple Scales” sponsored by Hanyang University, Seoul, Korea, chaired by T. Park and X. Chen (with a dedicated special issue in the Journal of Engineering Materials and Technology of the ASME). He was also honored by an International Mini-Symposium on “Multiscale and Mechanism Oriented Models: Computations and Experiments” sponsored by the International Symposium on Plasticity and Its Current Applications, chaired by V. Tomar and X. Chen, in January 2013. Voyiadjis was Honored in April of 2012 by the International Symposium on “Multi-physical Solutions for Harsh Environments: Computations and Experiments” sponsored by Hanyang University, Seoul, Korea, chaired by T. Park and X. Chen (with a dedicated special issue in the Journal of Engineering Materials and Technology of the ASME)^[3].

He is a Distinguished Member of the American Society of Civil Engineers, Fellow of the American Society of Mechanical Engineers, the Society of Engineering Science, the American Academy of Mechanics, the Engineering Mechanics Institute of ASCE, and Associate Fellow of the American Institute of Aeronautics and Astronautics. He was on the Board of Governors of the Engineering Mechanics Institute of the American Society of Civil Engineers, and Past President of the Board of Directors of the Society of Engineering Science. He was also the Chair of the Executive Committee of the Materials Division (MD) of the American Society of Mechanical Engineers. Dr. Voyiadjis is the Founding Chief Editor of the Journal of Nanomechanics and Micromechanics of the ASCE and is on the editorial board of numerous engineering journals. He was also selected by Korea Science and Engineering Foundation (KOSEF) as one of the only two World Class University foreign scholars in the area of civil and architectural engineering to work on nanofusion in civil engineering. This is a multimillion research grant.

1. Voyiadjis, G. Z., and Kattan, P., Advances in Damage Mechanics: Metals and Metal Matrix Composites, 542 p., Elsevier, Oxford, ISBN 0-08-043601-3, 1999.
2. Kattan, P., and Voyiadjis, G. Z., Damage Mechanics with Finite Elements: Practical Applications with Computer Tools, 114p., with CD-ROM, Springer-Verlag GmbH & Co.KG, ISBN: 3-540-42279-X, 2001.
3. Voyiadjis, G. Z., and Kattan, P., Mechanics of Composite Materials with MATLAB, 336 p., with CD-ROM, Springer-Verlag GmbH & Co.KG, Heidelberg, ISBN: 3540243534, 2005.
4. Voyiadjis, G. Z., and Kattan, P., Damage Mechanics, 257 p., CRC Press - A Taylor & Francis Company, Florida, USA, ISBN: 082472756, 2005.
5. Voyiadjis, G. Z., and Song, C. R., The Coupled Theory of Mixtures in Geomechanics with Applications, 438 p., Springer-Verlag GmbH & Co.KG, Heidelberg, ISBN: 3-540-25130-8, 2006.
6. Voyiadjis, G. Z., and Kattan, P., Advances in Damage Mechanics: Metals and Metal Matrix Composites With an Introduction to Fabric Tensors (2nd edition), 742 p., Elsevier, Oxford, ISBN: 0-08-044688-4, 2006.
7. Voyiadjis, G. Z., and Woelke, P., Elasto-Plastic and Damage Analysis of Plates and Shells, 201 p., Springer-Verlag GmbH & Co.KG, ISBN-10: 354079350X, 2008.
8. Voyiadjis, G. Z., Doktor Honoris Causa Politechniki Poznanskiej: Constitutive Modeling and Simulation of Materials/Structures under Extreme Loadings due to Impact Loading at High Strain Rates, 171 p., COMPRINT, Poznan, Poland, ISBN 978-83-7775-458-0, 2017.
9. Voyiadjis, G. Z., and Yaghoobi, M., Size Effects in Plasticity, 418 p., Elsevier Inc. ISBN: 9780128135136, 2019.
10. Voyiadjis, G. Z., and Song, Y., Gradient-enhanced Continuum Plasticity: Theories, Experiments and Numerical Methods, 440 p., Elsevier Inc., ISBN: 9780128177662, 2020.

Category:Living people Category:Columbia University alumni Category:1946 births Category:Louisiana State University faculty Category:California Institute of Technology alumni Category:Ain Shams University alumni Category:Highly Cited Researchers