Date of Award


Document Type


Degree Name

Master of Science in Engineering (MSE)


Mechanical and Aerospace Engineering

Committee Chair

Judith Schneider

Committee Member

Jason Mayeur

Committee Member

Phillip Allen


Fracture mechanics., Metals--Testing.


Material fracture properties are characterized by means of specimen level material tests, such as ASTM Standard E399 Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials. Recent investigations into certain high-toughness alloys have demonstrated a specimen size effect on the results of E399 tests. This thesis describes an experimental investigation into a proposed alternative analysis method for E399 tests that produces a specimen size insensitive result, termed KIsi. The work demonstrates that the alternative approach reduced the specimen size effect, validates assumptions on crack extension, and evaluates proposed test validity requirements. Suggestions for improvements to the KIsi method are also provided.



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