Three-Dimensional Mixed-Mode Fracture of the Four-Point Shear Specimen

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Cohen, Mark E.




Traditionally, fracture testing has focused on the fracture toughness of specimens undergoing pure mode I loading, often simplified by 2D assumptions of plane strain or plane stress. In reality, components have finite-thickness, and often see complex loading configurations. To study this complex behaviour, mixed-mode fracture specimens been developed. In this thesis, extensive three-dimensional finite element analysis is conducted to study two specimens: the (antisymmetric) four-point shear (FPS) specimen— a mode II test specimen, and the asymmetric four-point shear (AFPS) specimen — a mixed mode I/II specimen. Complete solutions of fracture mechanics parameters KI, KII, KIII, T11, and T33 have been obtained for a wide range of a/W and t/W geometry combinations. The thickness of specimen has a significant effect on the variations of both fracture parameter values and plastic zone sizes. The results presented here will be very useful for the toughness testing of materials under mixed-mode loading conditions.


Applied Mechanics
Engineering - Mechanical




Carleton University

Thesis Degree Name: 

Master of Applied Science: 

Thesis Degree Level: 


Thesis Degree Discipline: 

Engineering, Mechanical

Parent Collection: 

Theses and Dissertations

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