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TECHNICAL PAPERS

Quasi-Static Propagation of Subinterfacial Cracks

[+] Author and Article Information
H. Lee

Research Fellow in Aeronautics, California Institute of Technology, Pasadena, CA 91125

S. Krishnaswamy

Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208-3030   e-mail: s-krishnaswamy@nwu.edu

J. Appl. Mech 67(3), 444-452 (Jan 11, 2000) (9 pages) doi:10.1115/1.1311275 History: Received May 18, 1999; Revised January 11, 2000
Copyright © 2000 by ASME
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References

Figures

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Three-point bend PMMA/AI 6061 specimen: (a) actual specimen=(b) beam without crack and only applied load+(c) plate without applied load and only dislocations to cause crack
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Modification of edge crack problem to center crack problem: (a) edge crack model, (b) center crack model, (c) traction stresses of edge crack, (d) traction stresses of center crack
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The traction stresses at imaginary crack line locations from Bernoulli-Euler beam bending analysis
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Stress intensity factor and crack extension and deflection forces for the PMMA/AI 6061 bimaterial specimen III as predicted by the model
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(a) Optical layout of the shearing interferometric system, (b) schematic of the shearing interferometer
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Global and local coordinate systems for a propagating crack
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(a) Comparison of crack propagation trajectories in PMMA/AI 6061 bimaterial specimen I, numerical simulation superposed on the experimental results; (b) shearing interferometric fringes for PMMA/AI 6061 bimaterial specimen I; (c) measured stress intensity factor and phase angle versus crack propagation distance of PMMA/AI 6061 bimaterial specimen I
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(a) Comparison of crack propagation trajectories in PMMA/AI 6061 bimaterial specimen II; numerical simulation superposed on the experimental results. (b) Shearing interferometric fringes for PMMA/AI s6061 bimaterial specimen II. (c) Measured stress intensity factor and phase angle versus crack propagation distance of PMMA/AI 6061 bimaterial specimen II. (d) Crack surface contacts in PMMA/AI 6061 bimaterial specimen II. (i), (ii), (iii), and (iv) are zoomed images of Figs. 8(b), (d), (g), and (i), respectively.
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(a) Comparison of crack propagation trajectories in PMMA/AI 6061 bimaterial specimen III; numerical simulation superposed on the experimental results. (b) shearing interferometric fringes for PMMA/AI 6061 bimaterial specimen III. (c) Measured stress intensity factor and phase angle versus crack propagation distance for bimaterial PMMA/AI 6061 specimen III.

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