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CURRICULUM VITAE CURRICULUM VITAE
PERSONAL
Name: Tamer Elsayed Email: Tamer@alumni.caltech.edu Web page: http://www.aero.caltech.edu/~tamer/
EDUCATION
CALIFORNIA INSTITUTE OF TECHNOLOGY (2003 - 2007)
- Fulfilled Doctor of Philosophy Degree Requirements in Mechanical Engineering, 2007.
- Master of Science Degree in Mechanical Engineering Conferred in 2004.
- Research Topic: ``Constitutive Models for Polymers and Soft Biological Tissues''.
- Advisor: Professor Michael Ortiz.
- Grade point average: 3.90/4.0
A constitutive model for a wide class of polymers and soft biological tissues in the finite strain regime is formulated. The model includes rubber-like hyperelasticity, finite viscosity, deviatoric and volumetric plasticity, rate and microinertia effects. Model parameters are identified via genetic algorithms to fit available tests on polyurea, high-density polyethylene and brain tissue, proving the model's capability in predicting experimentally observed hysteresis, cyclic softening, rate effects, shear and cavitation plasticity. One implemented application of the model is the ductile and brittle fracture of composite plates and shells under dynamic loading. Another implemented application is in biomechanics where the biomaterial of brain tissue is modeled and included in simulating head injury under an accelerating load. This research involves programming in C++ for UNIX.CALIFORNIA POLYTECHNIC UNIVERSITY (CAL POLY) POMONA (1998 - 2002)
- Bachelor of Science in mechanical engineering conferred in 2002.
- Grade point average: 3.92/4.00
- Senior Project: ``Manufacturing and Testing of NASA's Jet Propulsion Laboratory's Inflatable Synthetic Aperature Radar Antenna''.
Passed with excellence course work emphasizing: CAD design, technical writing, statistical analysis, advanced engineering measurements, strength of materials, stress analysis, finite element analysis, machine design, computer applications, advanced dynamics, thermodynamics, fluid mechanics, and other related subjects. Received an invitation by the California Institute of Technology Grad Preview Program in 2002 to apply for graduate studies in mechanical engineering and received admissions offers from MIT, Michigan Ann Arbor, and University of Southern California (USC) graduate schools. Acted as president of Tau Beta Pi (All Engineering Honor Society) at Cal Poly for the year 2000/2001, Pi Tau Sigma (Mechanical Engineering Honor Society) marketing executive for the year 1999/2000.
AWARDS
9th. United States Congress on Computational Mechanics, San Francisco (July, 2007)
California Institute of Technology (Caltech) (2003 - Present)
- First place winner in the material modeling category of the student presentation competition.
- Recepient of the institute's prestigious fellowship for the 2003-2004 academic year.
Cal Poly Pomona (1997 - 2003)
- Valedictorian of the mechanical engineering department.
- Included in the university president's list of honor students.
- Included in the dean's list of honor students.
- Recepient of the Chevron scholarship for academic excellence.
- Recepient of the university president's scholarship for academic excellence.
Chaffey Community College (1994 - 1997)
- First graduate with an Associate Degree in physics and mathematics maintaining a perfect 4.00 grade point average.
- Mathematics student of the year in 1997.
Al-Tabary Secondary School in Egypt (1991 - 1993)
- Ranked fifth in the Arab Republic of Egypt with the third highest score in the nation amongst more than 250,000 students.
- Recepient of the Minister of Education Honorary Certificate for academic excellence.
PROFESSIONAL EXPERIENCE
Senior Scientist at a local company (full-time) (please contact me for details) (August 2008 - Present):
Postdoctoral Scholar (full-time) (October 2007 - July-2008):
- Conducting research on material modeling for nano precision manufacturing.
California Institute of Technology, Graduate Aeronautical Laboratories (GALCIT)
- Conducted research on advanced biological tissue and polymer multi-scale modeling.
- Conducted parametric studies involving blast and ballistic impact on composite plates and shells to determine critical V50 velocities.
- Developed computational capability to model underwater blast on composite shells via fluid-solid coupled solvers.
- Assisted and supervised current graduate students in their research.
- Responsible for writing grant technical reports and proposals.
Graduate Student and Ph.D. Candidate (full-time) (September 2003 - October 2007):
California Institute of Technology
- Formulated a new soft material constitutive model for polymers and soft biological tissues capable of capturing large strains, hysteresis, rate sensitivity, stress softening (Mullins effect), and deviatoric and volumetric plasticity (first place winner in material modeling at the 9th. Unites States Congress in Computational Mechanics, San Francisco, 2007).
- Established computational capability for assessing the blast performance of metal/elastomer composite shells utilizing the above model for the elastomer.
- Assessed the underwater blast performance of a composite ship hull by assigning the proper model, material properties, and cohesive law to the corresponding metal/polymer (DH36 steel/polyurea) across the thickness.
- Utilized a 3-dimensional porous plasticity model with ductile fracture via localization elements to model the above composite with 3D elements and validate ballistic impact with different loading conditions.
- Simulated axonal damage due to head injury through shearing plastic deformation, and focal damage through the volumetric plastic deformation induced by the tension tail of an impact wave.
- Acted as reviewer for the International Journal of Solids and Structures.
Mechanical Engineering Intern (February 2000 - November 2000):
NASA's Jet Propulsion Laboratory, Pasadena
- Assisted JPL engineers in the research, planning, design, setup, and development of the Inflatable Synthetic Aperture Radar Antenna experiment.
- Conducted mechanical tests on advanced inflatable structural systems to be used in NASA missions.
- Developed experience in finite element analysis modeling using FEMAP and MSC NASTRAN.
Engineering Consultant (part-time) (January 2000 - current):
- Currently acting as consultant on material modeling for nanoPrecision Products, Inc.
- Acted as consultant for Dynamic Implants, Inc. on the validation of a new dental implant design.
- Acted as consultant on the simulation of a new heart valve mechanism.
TEACHING EXPERIENCE
Head Teaching Assistant Spring Quarter (March 2007 - June 2007)
California Institute of Technology (Caltech)
- Acted as head teaching assistant for ``Mechanics of Materials'' class.
- Duties included giving some lectures in place of professor, managing and directing other teaching assistants, grading homework and holding office hours.
Engineering and Mathematics Instructional Assistant and Tutor (full-time) (September 2002 - June 2003)
Private Tutor (January 1999 - August 2002)
Chaffey Community College and Privately
- Acted as instructional assistant and tutor in engineering, physics, and mathematics.
- Gained proficiency in problem solving and communication skills.
JOURNAL PUBLICATIONS
- T. El Sayed, A. Mota, F. Fraternali, M. Ortiz, 2008. A Variational Constitutive Model for Soft Biological Tissues. Journal of Biomechanics 41(7), 1458-1466
- T. El Sayed, A. Mota, F. Fraternali, M. Ortiz. Biomechanics of traumatic brain injury, Comput. Methods Appl. Mech. Engrg. (2008), doi:10.1016/j.cma.2008.06.006
- "Computational Assessment of Ballistic Impact on a High Strength Structural Steel/Polyurea Composite Plate." (T. El Sayed, W. Mock, A. Mota, F. Fraternali, M. Ortiz) (accepted for publication by "Computational Mechanics")
- "Structural Shape Optimization via Variational Methods and Evolutionary Algorithms." (F. Fraternali, Andrea Marino, T. El Sayed, Antonio Della Cioppa) (submitted to "Mechanics of Advanced Materials and Structures")
- "On the Correlation Between Impact Induced Damage in Brain Tissue and Physiological Dysfunction." (F. Velardi, L. Brigante, T. El Sayed, A. Mota, F. Fraternali, M. Ortiz) (to be submitted to "Neurosurgery" in 2008)
- "A Phenomenological Constitutive Model of Finite Viscoelasticity, Viscoplasticity and Tensile Damage in Polymers." (T. El Sayed, A. Mota, F. Fraternali, M. Ortiz) (in preparation)
CONFERENCE PROCEEDINGS AND INVITED TALKS
- 15th. U.S. National Congress on Theoretical and Applied Mechanics, Boulder, Colorado, June, 2006. ``Blast Mitigation in Composite Shells" by Tamer Elsayed (presenter), Fehmi Cirak, Fernando Fraternali, Michael Ortiz.
- 7th. World Congress on Computational Mechanics, Los Angeles, California, July, 2006. ``Effect of Blast Loads on Reinforced Plates and Shells" by Tamer Elsayed (presenter), Fehmi Cirak, Fernando Fraternali, Michael Ortiz.
- 7th. World Congress on Computational Mechanics, Los Angeles, California, July, 2006. ``Response of Brain Tissue to Impact/Acceleration Loading" by Fernando Fraternali (presenter), Alejandro Mota, Tamer Elsayed, Michael Ortiz.
- 9th. United States National Congress on Computational Mechanics (San Francisco, July 23-26, 2007). ``Blast and Ballistic Impact on Polymer Reinforced Plates and Shells'' by Tamer Elsayed (presenter), Alejandro Mota, Fernando Fraternali, Michael Ortiz. (First place winner in material modeling)
- University of California, Los Angeles (UCLA) Mechanical and Aerospace Engineering Seminar: "A Variational Constitutive Model for Polymers and Soft Biological Tissues with Applications". (invited talk)
AFFILIATIONS
- Member, Tau Beta Pi - The All Engineering Honor Society, 1999
- Member, Pi Tau Sigma - The Mechanical Engineering Honor Society, 1999
- Member, Golden Key Honor Society, 1999
- Member, The American Society of Mechanical Engineers, 1999
OTHER
- Certified as ``Engineer-in-Training'' by the California Board For Professional Engineers and Land Surveyors.
- Experienced in: SolidWorks, Microstation CAD, Mathematica, Matlab, Microsoft Word, Excel, Power Point, FEM NASTRAN, Cosmos, C and C++ programming languages, technical writing and public presentations.
- Bilingual, fluent in Arabic language (written and oral).
REFERENCES
- Professor Michael Ortiz (Advisor), Dotty and Dick Hayman Professor of Aeronautics and Mechanical Engineering at California Institute of Technology (Caltech)
1200 East California Boulevard, MS 105-50
Pasadena, CA 91125 USA
tel (626) 395-4530
fax (626) 449-6359
Email: ortiz@aero.caltech.edu- Professor Guruswami Ravichandran, John E. Goode Professor of Aeronautics and Mechanical Engineering at California Institute of Technology (Caltech)
1200 East California Boulevard, MS 105-50
Pasadena, CA 91125 USA
tel (626) 395-4525
fax (626) 449-6359
Email: ravi@caltech.edu- Professor Chris Brennen, Richard L. and Dorothy M. Hayman Professor of Mechanical Engineering at California Institute of Technology (Caltech)
1200 East California Boulevard, MS 104-44
Pasadena, CA 91125 USA
tel (626) 395-4117
fax (626) 568-2719
Email: brennen@caltech.edu