Skip to main content

 

Cheung J. Poon, Ph.D., P.Eng.
Professor

Department of Aerospace Engineering
Office:ENG 160, George Vari Engineering and Computing Center
Phone: (416) 979-5000 ext. 4881
Fax: (416) 979-5056
E-mail: c1poon@ryerson.ca

Research Interests:

Fiber metal laminates, composite materials, laser welding, laser consolidation, smart structures.

Current Research Project(s):

The research plan focuses on composite materials that involve carbon fiber reinforced composites and fiber metal laminates (FML) that are hybrid materials involving thin metallic sheets reinforced by alternating sandwiched fiber layers. These advanced materials offer reduced structural weight of 20% to 30% through density reduction, higher permitted operating stresses, and design innovations that use the ability of ?tailoring? the material properties. Significant improvements in product durability can be expected through improved fatigue resistance, corrosion resistance, and damage tolerance. The research will develop innovative design methodologies and manufacturing processes to reduce the acquisition cost of integral aerospace structures manufactured from advanced materials and processes. It will also focus on the development of enabling technologies to determine the requirements for maintenance and repair and to quantify the effects of defects or damage on the residual life and operational expectancy of integral aerospace structures. The research work will involve experimental characterization of advanced materials through innovative testing at all levels from coupons to full-scale components to provide an extensive database for design and certification purposes and for basic understanding of material failure modes that are required for safe use of advanced materials. Critical failure modes will be studied using optical and scanning electron microscopes and fiber optic sensors with the results catalogued in a database that can be transferred to the industry for use in formulation of design criteria, validation of analytical results and certification of products. The key outcome of the research is the development of a fundamental knowledge base for use in design and manufacture of affordable integral aerospace structures made from advanced composite materials and fiber metal laminates. These integral aerospace structures are designed to have a much lower part counts and weight than those of conventional metallic structures made by machining and riveting techniques. The research is expected to provide excellent training opportunities for Highly Qualified Personnel.

Selected Publications:

Wu, X., Poon, C., and Raizenne, D., "Method and System for Prediction of Precipitation Kinetics in Precipitation-Hardenable Aluminum Alloys," US Patent 6,925,352 B2, August 2, 2005.


Lalibert�, J., Poon, C., Straznicky, P. V., Kok, L., and Rans, C., "Fatigue Testing of Fibre Metal Laminates for Regional Aircraft Applications in Canada," Proceedings of International Committee on Aeronautical Fatigue ICAF 2005, Hamburg, Germany, June 6-10, 2005.


Poon, C.,Lalibert�, J., Kok, L., Shi, G., Jodoin, A., Mendis, Y., and Straznicky, P, "Development of GLARE Fuselage Panels Using Building Block Approach", Proceedings of the 5th Joint Canada-Japan Workshop on Composites, Yonezawa, Japan, Septermber 6-8, 2004.


Poon, C., B. Thomas, M. Xiao, P. Bradley, and G. Stephen, "Optimization of Laser Welding Process," European Congress and Exhibition on Advanced Materials and Processes, EUROMAT 2003, Lausanne, Switzerland, September 1-5, 2003.


Cao, X., Wallace, W., Poon, C., and Immarigeon, J.-P., "Review on Laser Welding of Wrought Aluminum Alloys, Part I: Laser Welding Process,"  Materials and Manufacturing Processes, Vol. 17, 2003.
Lalibert�, J. F., Poon, C., Straznicky, P. V., and Fahr, A., "Post-Impact Fatigue in Fiber-Metal Laminates," International Journal of Fatigue, 24, 2002, pp. 249-256.


Key Words:Fiber metal laminates, composite materials, fiber optic sensors, laser welding, laser consolidation, material characterization, full-scale structural testing.