 Dr. Christos C. Chamis
Biography
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Dr. Chamis serves as the Senior Aerospace Scientist in the Research and Technology Directorate at NASA Glenn Research Center. The Directorate mission includes research and technology development for aeronautics and space power; advanced aerospace electric power systems; primary and auxiliary space propulsion systems; structures and materials, as well as technical support of national programs (high speed civil transport, advanced subsonic transport, general aviation aircraft and others).
Over the past four decades he has developed new theories, solutions, techniques, and algorithms including: a semi-empirical theory for or of composite micromechanics; the reduced bending stiffness for coupled bending/stretching buckling and vibration problems; procedures in closing the materials‑research structural-design cycle; failure criteria for filamentary composites; criteria for selecting resin matrices for improved composite strength and toughness; criteria for assessing the impact resistance of fiber composites; criteria for characterizing, identifying, and qualifying fracture modes in fiber composites; the quasi‑isotropic analogy for the analysis of planar randomly reinforced fiber composites; methods for assessing in situ ply strength; and the development of a general class of hybrids ‑ superhybrids, inter and intraply hybrids, and strip hybrids; a unified theory for composite micromechanics equations, hygrothermomechanical theory for organic matrix composites; composite micromechanics with interphase for high temperature (up to 4000° F) composites; simplified composite mechanics, application of finite element substructuring methods to composite mechanics, simplified design procedures for composite structures and laminate analogy for composite enhanced reinforced concrete structures.
He also conceived and helped implement three unique test facilities (multiaxial composite tube testing with load and displacement control and provisions for computer control, high velocity impact - with local and remote monitoring and real time ultrasonic monitoring of composite progressive fracture).
In addition, he is leading research for the development of 3-D inelastic methods for hot structures, structural tailoring methods for engine structures, engine structures computational simulator (First Phase), probabilistic structural analysis, structural fracture, and furthermore, he has successfully advocated advanced methods (some based on new paradigms) development programs (requiring multi-million dollars, multi-institution, multi-years) for: (1) 3-D inelastic analysis, (2) probabilistic structural analysis, (3) structural tailoring, (4) high temperature composite mechanics, (5) computational structural mechanics, (6) integrated probabilistic assessment of composite structures, (7) concurrent optimization of processing and constituent material characteristics to maximize load of composite laminates, (8) structural tailoring of orthopedic joints, (9) coupled multi-disciplinary methods, (10) computational simulation of low cost component fabrication, (11) thermal electrical equivalence for efficient simulation of smart composite structures, (12) mixed-field finite elements, (13) multi-scale mechanics, (14) particulate composite mechanics, (15) woven fabric mechanics and (16) engine technology benefit estimator, as well as academic grants with leading professors from universities throughout the country.
The research to date, led to the development of 29 specialty computer codes with multifunction, multidiscipline capability. Several of these computer codes are used by aircraft engine companies (METCAN, CEMCAN, CSTEM, STAEBL, STAT) the aircraft airframes industry (CODSTRAN, ICAN, HITCAN, IPACS) and the space propulsion industry (NESSUS). ICAN was made widely available through the government sponsored technology transfer agency (COSMIC and Glenn Technology Utilization Office) and has been used across many industries including cement manufacturers, rubber industry, biomedical, academia and even in optics.
He has expanded his duties to include monitoring and mentoring the development of new technology in industry and the transfer and adoption of government developed technology to industry under NASA’s Small Business Innovative Research and Small Business Technology Transfer Programs.
His most recent research is in nontraditional methods development that includes: (1) telescopic/tunneling mechanics, (2) nondeterministic optimization, (3) computational fatigue, (4) test-free fracture-toughness, (5) computationally simulated energy release mechanisms, (6) probabilistic dynamic composite shell buckling, (7) two-way predictor-corrector algorithm for accurate probability predictions, (8) corrosion of composite structures, (9) erosion of composites structures, (10) nano composite structures, (11) micro energy rates for composite durability, and (12) biomechanics by equivalent variables.
Education
BCE Cleveland State University – June 1960
MSEM Case Western Reserve University – June 1962
Ph.D. Case Western Reserve University – November 1967
Technical Memberships/Professional Affiliations
Since Dr. Chamis joined NASA Glenn Research Center, he has published extensively in NASA TM Reports, NASA Tech Briefs, in journals and in conference proceedings. He is a frequent invited speaker at national and international meetings and in NATO sponsored conferences. He was an ASME Distinguished Lecturer for five years, 1994 to 1998. His lectures covered polymer composites, metal matrix composites, and probabilistic simulation. He served 4 years as the technical program chair and 3 years as the chair of the Non-Deterministic Approaches in the SDM Conference which is sponsored by several professional societies.
He has organized 55 technical sessions dealing with composites and computational mechanics methods; organized and chaired two ASTM Specialty Symposia and co‑chaired the Sixth NASTRAN Colloquium; participates in organizing annual conferences of the AIAA/ASME/ASCE/AHS/ASC - SDM (1986 - present) three Forums on nondeterministic approaches; he developed an advanced training program for engine structures and had primary responsibility for the Glenn/University Workshop on engine structures; had primary responsibility for the NASA Glenn/University graduate research program which resulted in 28 degrees awarded from June 1980 to December 1992; authored or co‑authored nine book chapters and edited a special edition of the Journal, Science and Technology on High Temperature Composites, 1993.
He edited 2 book volumes in analysis and design of composite structures and 2 ASTM, STP’s on test methods and design allowables of fibrous composites; authored or co‑authored over 400 papers which appeared in conference proceedings and/or journals; has reviewed over 200 articles for technical journals and applied mechanics reviews. He serves as a reviewer of technical proposals for the NSF, AFOSR, and the Army; has frequent correspondence with colleagues in the composite community; and has frequent requests for letters of recommendation for faculty promotions. Through interaction with colleagues, he provided mentoring to help promote them to directors, supervisors, senior technical researchers, chaired professors and starters of small business.
Honors and Awards
Dr. Chamis has received numerous NASA and Professional Society Awards including: Outstanding Conference Papers, Distinguished Service Medal, Exceptional Engineering Achievement, ASME-IGTI Structures Technology (first one), SAE Probabilistic Methods Development (first one), AIAA Northeast Ohio Engineer of the Year, the AIAA/SDM Award, 1998, the Northeast Ohio Enterprise Development Innovation (EDI) Award, the NASA Agency-wide Software of the Year Award (SYA) in 1999, the NASA Turning Goals into Reality, 2000, IR-100, 2000, and the Tibbets Award, 2001. Dr. Chamis’ many and broad technical and professional contributions to the development of versatile computational structures technology have been recognized by his peers and contemporaries (over 500 literature citations) and rewarded him with Fellow status in:
- American Institute for Aeronautics and Astronautics
- American Society for Testing and Materials
- Society for the Advancement of Materials and Process Engineering
- American Society for Mechanical Engineers
- American Society for Civil Engineers
- Society of Automotive Engineers
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