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Dr. Ahmad Varvani-Farahani

Ahmad Varvani-Farahani
BSc, MASc, PhD, PEng
416-979-5000 ext. 557707

Areas of Academic Interest

Fatigue fracture analysis

Cyclic plasticity and ratcheting

Materials testing and analysis

Stress analysis

Finite element analysis

Elasticity and plasticity

Composite materials

Biomaterials, artificial tissues and implants


Year University Degree
1998 University of Waterloo PhD
1994 University of Waterloo MASc
1990 University of Tabriz BSc

Selected Courses

Course Code Course
ME8136 Advanced Fatigue Fracture Analysis
MTL 700 Materials Selection for Engineering Design
BME 406 Biomechanics


Over 70 per cent of machinery parts and load-bearing components undergo premature failure. With so many lives on the line daily – people in cars, in aircrafts and in hospitals – reliability of mechanical devices is of the utmost importance. For Ahmad Varvani-Farahani, failure is not an option. Following the Space Shuttle Challenger disaster in 1986, Varvani was motivated to advance the reliability of machines and space vehicles through his education in mechanical engineering. 

Today, he is ambitious to upgrade quality of life in society through design of risk-free and durable devices. Varvani’s focus is to broadly develop models and theories on damage assessment and failure of materials. This ensures performance and structural integrity of vehicles, airplanes and diagnostic health-care equipment, making society safer today than it was yesterday. Research outcomes and innovative ideas developed within his group have helped to solve several challenging engineering problems and benefited society and industry with durable parts and structures. “We assess the magnitude of damage caused by dynamic loads in automotive, aviation and medical fields. That’s how we protect lives.”

Ahmad Varvani-Farahani

“Over the next century, researchers and engineers will solve challenging mechanical problems by further innovating the foundations of physics and mechanics.”

  • Ahmadzadeh, G.R., and Varvani-Farahani, A. “Energy-Based Damage Descriptions to Assess Fatigue Life of Steel Alloys Undergoing Various Loading Spectra.” International Journal of Damage Mechanics, vol. 28, no. 1, 2019, pp. 35-57.
  • Karvan, P., and Varvani-Farahani, A. “Ratcheting Assessment of Visco-Plastic Alloys at Ambient Temperature by Means of the A-V and O-W Hardening Rule Frameworks.” Mechanics of Materials, vol. 130, 2019, pp. 95-104.
  • Shekarian, A., and Varvani-Farahani, A. “Concurrent Ratcheting and Stress Relaxation at the Notch Root of Steel Samples undergoing Asymmetric Loading Cycles.” Fatigue Fracture of Engineering Materials and Structures, vol. 42, 2019, pp. 1402-1413.
  • Varvani-Farahani, A., and Nayebi, A. “Ratcheting in Pressurized Equipment and Pipes: Review on Fundamental Analysis, Modeling, Design and Safety Challenges.” Fatigue and Fracture of Engineering Materials and Structures, vol. 41, no. 3, 2018, pp. 503-538. 
  • Varvani-Farahani, A. “A New Energy-Critical Plane Parameter for Fatigue Life Assessment of Various Metallic Materials Subjected to In-phase and Out-of-phase Multiaxial Fatigue Loading Conditions.” International Journal of Fatigue, vol. 22, 2000, 295-305.
  • Multiaxial Fatigue Research Facilities