Education University of Oxford | Name Ares Rosakis | |
Born 12 September 1956 (age 68) Athens, Greece ( 1956-09-12 ) Alma mater Athens CollegeOxford UniversityBrown University Known for dynamic materials failuresupershear earthquakes Spouse Ioanna Dimitracopoulou(m. 1990–present) Children Angele RosenbergPhillip RosenbergAlexandros Rosakis | ||
Ares J. Rosakis is the Otis Booth Leadership Chair, Division of Engineering and Applied Science, and Theodore von Karman Professor of Aeronautics and Mechanical Engineering at the California Institute of Technology. Before that he was the fifth Director of the Graduate Aerospace Laboratories known as (GALCIT) and formerly known as the Guggenheim Aeronautical Laboratory.
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Education
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 where he currently is the Otis Booth Leadership Chair, Division of Engineering and Applied Science, and Theodore von Karman Professor of Aeronautics and 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
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 are credited for the invention of 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 ten 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" 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. Indeed they 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 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
May 2009 – Present, As EAS Division Chair
2004- 2009, As Director of GALCIT
Caltech Leadership and Service
Controversies
Rosakis has been recently named in a lawsuit filed against Caltech. The lawsuit was filed by a Caltech faculty member, Dr. Sandra Troian, for retaliation against her for informing the FBI regarding ITAR violations at Caltech and JPL.The case was filed in November, 2014 at the Superior court of the state of California for the county of Los Angeles. Dr. Rosakis along with his colleagues (Dr. Morteza Gharib, Dr. Kaushik Bhattacharyya) have been named in the suit for threatening Dr. Troian for talking to the FBI. The entire lawsuit is available online.
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 Hetenyi Award, the 1996 B. L. Lazan Award, and the 2003 Frocht Award. 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 Academiques 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, he was elected member of the European Academy of Sciences and Arts (Academia Scientiarum et Artium Europaea), and most recently he was elected Foreign Fellow of the Indian National Academy of Engineering (INAE).
Publications
Professor Rosakis is the author of over 250 publications.