Fastening and Joining Research Institute (FAJRI)
Fastening and Joining Research Institute (FAJRI)The congressionally approved Fastening and Joining Research Institute (FAJRI) at Oakland University is the only known facility of its kind in the world: an academic, nonprofit research facility dedicated solely to the fastening and joining of materials. This one-of-a-kind facility pursues fundamental and applied research to develop and disseminate new technologies for the fastening and joining of metals, composites and polymers.
Through basic and applied research, the Fastening and Joining Research Institute will develop and disseminate new advanced technologies in the areas of automated assembly of bolted joints, adhesive bonding of composites, resistance welding and riveting, a niche area that significantly impacts the safety and reliability of many products in both the civilian and military sectors of the American economy.
FAJRI's research objective is to enhance the reliability and safety of metallic, composite and polymeric joints by advancing the science and technology of mechanical fastening, adhesive bonding, welding and riveting.
In its research, FAJRI employs a systems approach to advance the science and technology in the area of fastening and joining. The systems approach is applied to:
- threaded fasteners in bolted assemblies made of metals, composites, plastics and advanced polymers
- adhesive bonding of laminated and fiber reinforced composites
- resistance welding of metals
- advanced riveting
The systems approach, as it applies to each of the above four areas of fastening and joining, simultaneously investigates the significant variables and variable combinations in order to improve the safety, quality and reliability of mechanical joints. Analytical, experimental and computer simulation techniques are used in the research.
By disseminating new fastening technology to the automotive, aerospace, transportation and nuclear power industry, FAJRI research will improve product safety and quality, reduce equipment downtime, and benefit the U.S. economy in both the civilian and defense sectors.
Serving as a unique resource center in an academic setting, FAJRI helps the scientific, governmental and industrial sectors of the American economy. It improves:
- transportation safety of passenger cars and trucks as well as bridges and highways
- commercial aircraft safety, since more than 2 million fasteners are used on a commercial jet
- safety of nuclear power plants and the safety and reliability of traditional fossil plants
- vehicle mobility and readiness
- U.S. and local economies by increasing productivity through reduced downtime and warranty costs associated with failed machines and products
- technology transfer between academia and industry at the local and national levels
- engineering education by emphasizing safety and reliability in product design and manufacturing
At FAJRI, 10 Ph.D. and M.S. graduate research assistants are fully supported to pursue their theses research under the supervision of eight professors. In addition to fundamental research, FAJRI is actively engaged in several externally sponsored applied research projects in fastening and joining. FAJRI is federally funded by the U.S. Congress, National Science Foundation (NSF) and DaimlerChrysler Corporation.
2003-2012 Funded Research
- Mechanical fastening and adhesive bonding of composite and polymer joints
- Self-loosening of threaded fasteners due to vibration and impact loads
- Ultrasonic control of bolt elongation during bolted joints assembly
- Tribology of threaded fasteners
- Clamp load loss due to cyclic service loads
- Non-destructive testing and inspection of composite and metallic joints
- Elastic interaction between fasteners in gasketed bolted joints
- Behavior and analysis of miniature bolted joints for biomedical and electronic devices
- Finite element modeling and analysis of composite, polymer and metallic joints
- Enhancing the reliability of bolted assemblies
- Development of torque specifications
At FAJRI, a team of eight faculty and 10 full-time Ph.D. and M.S. graduate students are engaged in fundamental and applied research. Each faculty member is an expert in his/her field and directs a specialty research lab in one or more of the following areas:
- Fasteners and bolted joints, Sayed Nassar, Ph.D.
- Non-destructive testing (NDT), with focus on optics and ultrasonic, Sayed Nassar, Ph.D., and Lian Yang, Ph.D.
- Fastening and joining of plastics and composites, Sayed Nassar, Ph.D.
- Tribology of threaded fasteners (friction, lubrication and wear), Gary Barber, Ph.D., Qian (Beth) Zou, Ph.D., and Sayed Nassar, Ph.D.
- Analytical, numerical and experimental stress analysis, Sayed Nassar, Ph.D., Randy Gu, Ph.D., and Lorenzo Smith, Ph.D.
- Applied mathematics and statistics, Sayed Nassar, Ph.D., and Meir Shillor, Ph.D.
The following are some of the recent journal publications of the FAJRI team:
- Housari, B. A., and Nassar, S.A., “Effect of Thread and Bearing Friction Coefficients on the Vibration-Induced Loosening of Threaded Fasteners Under Cyclic Transverse Loads”, 2007, ASME Journal of Vibrations and Acoustics-ASME Transactions, Vol. 129, pp. 484-494.
- Nassar, S.A. and Housari, B. A., “Study of the Effect of Hole Clearance and Thread Fit on the Self-Loosening of Threaded Fasteners Due to Cyclic Transverse Loads”, 2007, ASME Journal of Mechanical Design, Vol. 129, Issue 6, pp. 586-594.
- Nassar, Sayed A. and Alkelani, A.A., “Elastic Interaction and Creep Relaxation in Bolted Gasketed Joints”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, pp. 394-401.
- Nassar, S.A. and Matin, P., “Clamp Load Loss Due to Fastener Elongation Beyond its Elastic Limit”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, Nov. 2006, pp. 379-387.
- Nassar, Sayed A. and Veeram, Aditya B., “Ultrasonic Control of Fastener Tightening using Variable Wave Speed”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, pp. 427-432.
- Nassar, Sayed A. and Housari, B. A., “Effect of Thread Pitch on the Self-Loosening of Threaded Fasteners Due to Cyclic Transverse Loads”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, pp. 590-598.
- Nassar, S.A. and Matin, P. H., and G. C. Barber, “Thread Friction in Bolted Joints”, 2005, Journal of Pressure Vessels Technology- ASME Transactions, Vol. 127, pp. 387-393.
- Nassar, S.A., El-Khiamy, H., Barber, G.C., Zou, Q., Sun, T.S., “Bearing and Thread Friction in Fasteners”, 2005, Journal of Tribology, ASME Transactions, Vol. 127, pp. 263-272.
- Nassar, S.A., Barber, G.C., and Zuo, D., “Bearing Friction Torque in Bolted Joints”, 2005, STLE Tribology Transactions, Vol. 48, pp. 69-75.
- Nassar, Sayed A., and Matin, P. H., “Non-Linear Strain Hardening Model for Predicting Clamp Load Loss in Bolted Joints”, 2006, ASME Journal of Mechanical Design, Vol.128, Issue 6, pp.1328-1336.
- Nassar, S.A., Andrews, K.T., Kurk, S., and Shillor, M., “Modeling and Simulation of a Bonded Rod”, 2005, Journal for Mathematical and Computer Modeling, Vol. 42, pp. 553-572.
- Yang, X. and Nassar, S. A., “Constitutive Modeling of Time-Dependent Cyclic Straining for Solder Alloy 63Sn-37Pb”, 2005, Journal of Mechanics of Materials, vol. 37, pp. 801-814.
- Zou, Q., Sun, T.S., Nassar, S., Barber, G.C., El-Khiamy, H., “Contact Mechanics Approach to Determine Effective Radius in Bolted Joints”, 2005, Journal of Tribology-ASME Transactions, Vol. 127, pp. 30-36.
- Nassar, S.A. and Virupaksha, V.L., Ganeshmurthy, S., “Effect of Bolt Tightening and Joint Material on the Strength and Behavior of Composite Joints”, 2007, ASME Journal of Pressure Vessels Technology, Vol. 129, pp. 43-51.
- Nassar, S. A. and Matin, P.H., “Cumulative Clamp Load Loss Due to a Fully Reversed Cyclic Load Acting on an Initially Yielded Joint System”, 2006, ASME Journal of Mechanical Design, Vol. 129, pp. 421-433.
- Alkelani, A.A., Housari, B., Nassar, S.A., “A Proposed Model for Evaluating Gasket Creep Relaxation in Bolted Flanges”, 2007, in press, Journal of Pressure Vessels Technology-ASME Transactions.
- Nassar, S.A. and Meng, A., “Optical Monitoring of Bolt Tightening Using 3-D Electronic Speckle Pattern Interferometry (ESPI)”, 2007, ASME Journal of Pressure Vessels Technology, Vol. 129, pp. 89-95.