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Prof. Stephen W. Tsai

Emeritus Professor, SACL, Aeronautics & Astronautics

Office: Durand Building, Room 379

Phone: (650) 725-3305 | Fax: (650) 725-3377

Email: stsai [AT]


DEng Mechanical Engineering, Yale University, 1961.
BE Mechanical Engineering, Yale University, 1952.

Research Interests

  • Process and product development of composite materials that may lead to improved design practice and commercialization. His current interests include composite behavior as affected by static, creep and fatigue loading, and products like composite rotors for flywheel systems. Emphasis is on the design, manufacturing and evaluation of the performance and cost. Methodology and supporting software to provide safe service of 30 years under combinations of loads, temperatures and moisture.

  • He is a member of the National Academy of Engineering and have been active in the International Conference on Composite Materials. He is also a member of the American Society of Mechanical Engineering and the Society of Aerospace Materials and Process Engineers.

  • He has written two introductory texts on composite materials and two books on composites design. He is also known for the pioneering effort in promoting spreadsheet as a design tool.

Curent Projects

  • Failure theory of composite materials and structures that includes combined creep and fatigue loading under combinations of temperature and moisture environment. This theory is generic and is being applied to wind turbine blades and composite flywheel rotors.