Ares J. Rosakis

Ares J. Rosakis

Ares J. Rosakis, Theodore von Kármán Professor of Aeronautics and Professor of Mechanical Engineering;Division of Engineering and Applied Science
Born (1956-09-12) 12 September 1956
Athens, Greece
Institutions
Alma mater
Known for
Notable awards Von Karman Medal (2016)
Spouse
  • Ioanna Dimitracopoulou
    (m. 1990–present)
Children
  • Angele Rosenberg
  • Phillip Rosenberg
  • Alexandros Rosakis
Website
rosakis.caltech.edu

Ares J. Rosakis Theodore von Kármán Professor of Aeronautics and Professor of Mechanical Engineering at the California Institute of Technology. He was also the fifth Director of the Graduate Aerospace Laboratories, known as (GALCIT), and formerly known as Guggenheim Aeronautical Laboratory, and was the Otis Booth Leadership Chair, of the Division of Engineering and Applied Science.

Education/Career

Ares Rosakis graduated from Athens College, a Greek-American high school in June 1975. In September of 1975, he moved to the United Kingdom to attend University College Oxford to study engineering science. Dr. Rosakis received his BA and MA degrees in Engineering Science from Oxford University in 1978. He went on to earn his ScM and PhD degrees in solid mechanics from Brown University. He joined Caltech and GALCIT as an assistant professor in 1982 as the Institute's youngest tenure tract faculty member. He was promoted to the ranks of associate and full professor in 1988 and 1993 respectively. In 2004, he was named the Theodore von Kármán Professor of Aeronautics and Professor of Mechanical Engineering. In 2013, he was honored as the inaugural recipient of the Otis Booth Leadership Chair, Division of Engineering and Applied Science.

Research Interests

The fastest super-shear cracks on Earth: Bimaterial delamination; shear rupture of a graphite composite; and rupture of a frictional interface simulating a laboratory earthquake.

Professor Rosakis is the author of more than 260 works on quasi-static and dynamic failure of metals, composites, interfaces and sandwich structures, with emphasis on the use of high speed visible and IR diagnostics and laser interferometry for the study of dynamic fracture and dynamic localization. His early work includes the study of dynamic, ductile failure of structural metals by using high speed photography, the real-time measurement of temperature fields at the vicinity of dynamically growing cracks and adiabatic shear bands and the development of a variety of optical and dynamic infrared diagnostic methods. He and his coworkers invented Coherent Gradient Sensing, CGS, interferometry, a method sensitive to gradients of optical path gradients which has been used in both fracture mechanics and thin film stress measurements at the wafer level. Other interests include dynamic fragmentation; shear dominated intersonic rupture of inhomogeneous materials and composites, rupture mechanics of crustal earthquakes, shielding of spacecraft from hypervelocity micrometeoroid impact threats, the reliability of thin films and wafer level optical metrology. Professor Rosakis holds thirteen US patents on thin-film stress measurement and in situ wafer level metrology as well as on high speed infrared thermography.

In the late eighties, Rosakis introduced the concept of "laboratory earthquakes"[1] and since then his research interests have mainly focused on the mechanics of seismology, the physics of dynamic shear rupture and frictional sliding and on laboratory seismology. The goal of this body of work is to create, in a controlled and repeatable environment, surrogate laboratory earthquake scenarios mimicking various dynamic shear rupture process occurring in natural earthquake events. Such, highly instrumented, experiments are used to observe new physical phenomena and to also create benchmark comparisons with existing analysis and field observations. The experiments use high-speed photography, full-field photoelasticity, and laser velocimetry as diagnostics. The fault systems are simulated using two photoelastic plates held together in frictional contact. The far field tectonic loading is simulated by pre-compression while the triggering of dynamic rupture (spontaneous nucleation) is achieved by suddenly dropping the normal stress in a small region along the interface. The frictional interface (fault) forms various angles with the compression axis to provide the shear driving force necessary for continued rupturing. Rosakis and his co-workers, investigate the characteristics of rupture, such as rupture speed, rupture mode, associated ground motion under various conditions such as tectonic load, interface complexity and roughness. Both homogeneous and bimaterial interfaces (abutted by various elastic and damaged media) are investigated. Rosakis and his coworkers have been credited with the experimental discovery of the "intersonic" or "supershear rupture" phenomenon. They also have investigated this new phenomenon in various engineering and geophysical settings involving shear dominated rupture in the presence of weak interfaces or faults. Their experimental discoveries of supershear rupture has refocused the attention of the geophysics community to the study of supershear earthquakes.

Another recent research interest for Professor Rosakis is hypervelocity impact. Hypervelocity impact is a rising concern in spacecraft missions where man-made debris in low Earth orbit (LEO) and meteoroids are capable of compromising or depleting the structural integrity of spacecraft. To address these concerns, the goal of current research is to experimentally investigate the underlying mechanisms responsible for deformation and damage evolution during hypervelocity impact utilizing Caltech/JPL's Small Particle Hypervelocity Impact Range (SPHIR) facility. By combining high speed photography, optical, spectroscopic and infrared techniques, including Coherent Gradient Sensing (CGS) interferometry, the dynamic perforation behavior involving crater morphology, debris and ejecta formation and solid/fluid/plasma transitions and interactions have been examined.

Academic Leadership

Caltech President Jean-Lou Chameau and Ares Rosakis addressing École Polytechnique students during a ceremony to sign an agreement for a Master's Education Exchange Program in Aeronautics/Space Engineering and Mechanics.
Ares Rosakis, G. Ravichandran, and José Andrade with Ecuador's President Rafael Correa and Secretary René Ramírez, SENESCYT, discussing Yachay International University and City of Knowledge.
Acting Caltech President Ed Stolper, JPL Director Charles Elachi, Commandeur dans l'Ordre des Palmes Académiques recipient Ares Rosakis, and Consul General of France in Los Angeles Axel Cruau (photo credit: Bill Youngblood)
Professor Shih Choon Fong, Founding President KAUST (left) and Professor Ares Rosakis (right) at the Franklin Institute Awards Ceremony honoring Professor Subra Suresh, President, Carnegie Mellon University, April 25, 2013
Top: Ares Rosakis with Wings Award winner Abdul Kalam (11th President of India). Bottom: Ares Rosakis with Wings Award winner Yannick d'Escatha (Chairman of CNES).

May 2009 – 2015, As EAS Division Chair

2004- 2009, As Director of GALCIT

Caltech Leadership and Service

Honors and awards

Rosakis has been honored with many recognitions in mechanics, in aerospace and in materials failure including the 1989 Rudolf Kingslake Medal and Prize from the International Society of Optical Engineering (SPIE) and with various prizes awarded by the Society of Experimental Mechanics (SEM). These include the 1992 Hetényi Award,[5] the 1996 B. L. Lazan Award, and the 2003 Frocht Award.[6] In 2005 the same society selected him to become the William M. Murray Medalist and Lecturer for his life-long contributions to the development and application of advanced methods for accurate measurement of transient, dynamic phenomena. In 2007 he received the Harting Award (SEM).

In 2009, he was elected a Fellow of the American Academy of Arts and Sciences (AAAS). In 2010, he received the Brown Engineering Alumni Medal (BEAM) Award from the Brown University School of Engineering, and the Robert Henry Thurston Award from the American Society of Mechanical Engineers (ASME). In 2011, he received the A. Cemal Eringen Medal from the Society of Engineering Science (SES) and he was elected Fellow of the National Academy of Engineering (NAE). In 2012, he was appointed Commandeur dans l'Ordre des Palmes Académiques from the Republic of France. In 2013, he received the P.S. Theocaris Award from the Society of Experimental Mechanics for his lifelong contribution to experimental science and mechanics,[7] he was elected member of the European Academy of Sciences and Arts (Academia Scientiarum et Artium Europaea), and he was elected Foreign Fellow of the Indian National Academy of Engineering (INAE) and a corresponding member of the Academy of Athens (National Academy of Greece). In 2014 he was elected member of Academia Europaea. In 2015 he received the Sia Nemat-Nasser Medal from SEM for his interdisciplinary utilization of experimental mechanics to advance the field of earthquake Seismology. And most recently in 2016, he was elected to the National Academy of Sciences[8] (NAS) and awarded the Theodore von Karman Medal of the American Society of Civil Engineers.[9]

ACADEMY MEMBERSHIPS AND PROFESSIONAL SOCIETIES

Academies:

Associations and Societies:

Publications

Professor Rosakis is the author of over 250 publications.

References

  1. ↑ "Laboratory Earthquakes: The Sub-Rayleigh-to-Supershear Rupture Transition, Vol. 303 no. 5665 pp. 1859-1861". Science. 2004.
  2. ↑ "Times Higher Education World University Ranking". Times Higher Education World University Ranking. 2011.
  3. ↑ "Abdul Kalam prize in Aerospace". GALCIT.
  4. ↑ "Caltech ranked #1 in Aerospace Engineering". GALCIT.
  5. ↑ "M. HETÉNYI Award". Society for Experimental Mechanics (SEM). 2008.
  6. ↑ "M.M. Frocht Award". Society for Experimental Mechanics (SEM). 2003.
  7. ↑ "Theocaris Award". Caltech News. 2013.
  8. ↑ National Academy of Sciences Members and Foreign Associates Elected, News from the National Academy of Sciences, National Academy of Sciences, May 3, 2016, retrieved 2016-05-14.
  9. ↑ "Theodore von Karman Medal Past Award Winners". ASCE. Retrieved 11 December 2016.
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