Fatigue Fracture of the Stem–Cement Interface With a Clamped Cantilever Beam Test

[+] Author and Article Information
D. A. Heuer

Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294

K. A. Mann

Department of Orthopedic Surgery, SUNY Upstate Medical University, Syracuse, NY 13210

J Biomech Eng 122(6), 647-651 (Jul 10, 2000) (5 pages) doi:10.1115/1.1322035 History: Received August 15, 1999; Revised July 10, 2000
Copyright © 2000 by ASME
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Geometry (A) of the clamped cantilever beam specimens used to determine fatigue crack growth rates of the CoCr alloy/PMMA cement interface under cyclic fatigue loading. A metallic crack gage (B) was used to monitor total crack length (a) during loading. The depth of the specimen was 11 mm. All dimensions shown are in millimeters.
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Finite element mesh (A) in deformed state used to determine energy release rate for a unit applied load (P) and unit thickness. Dimensions were the same as used for the experimental geometry. Inset figures illustrate crack tip rosette and relative opening and sliding of nodal pairs near the crack tip. Nodal displacements were measured at a distance r from the crack tip (B).
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Energy release rates (GFEM) determined as a function of crack length (a) using the finite element method. Results indicate a good fit to the data using a quadratic polynomial.
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Experimental results of fatigue crack growth of the CoCr alloy/PMMA cement interface for precoated and plasma-sprayed surfaces. Each series of points represents the results of one test specimen. A total of seven specimens were tested for each surface finish type.
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A comparison of fatigue crack growth results from the present study (shaded light) with single-cycle fracture toughness data for the CoCr alloy/PMMA cement interface 20 and cyclic fatigue tests of bulk PMMA cement 2122.




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