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

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  • 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.

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  • Copyright © 2015 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2015


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