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3 Credits
Available Fall term
Lecture Only

OSU catalog link

ENGR 322
Jamie Kruzic
303C Dearborn Hall

Course Description

Fracture mechanics and fatigue mechanisms: mechanisms of ductile and brittle fracture. Environmentally induced fracture and fatigue. Considerations in design of engineering materials and structures will be discussed.


  • Stress intensity, superposition, crack tip plasticity, plane stress/strain, plastic constraint, critical crack size
  • G vs. K, CTODs, KIc testing, R-curves
  • R-curve testing, elastic-plastic fracture mechanics (EPFM), J-integral, JIc testing, fracture mechanisms
  • Ductile and brittle fracture, DBTT, toughening mechanisms, extrinsic vs. intrinsic toughening
  • Crack bridging, embrittlement, environmentally assisted cracking growth
  • Environmentally assisted crack growth, fatigue: (S/N) approach, crack initiation
  • Fatigue: damage tolerant approach, crack growth, life prediction, da/dN-DK testing, crack growth mechanisms, fatigue markings
  • Crack closure, brittle material fatigue, crack size effects

Learning Outcomes

The student, upon successful completion of this course, will be able to:

    1.     Correctly apply fracture mechanics (KIc, Gc, JIc) to predict material frailure.
    2.     Identify and describe the basic fracture and fatigue mechanisms.
    3.     Correctly predict fatigue life using S/N and fracture mechanics based methods.
    4.     Correctly identify the cause of failure of a material based on fracture surface observations.