A long-bar apparatus for subjecting relatively small samples to stress-wave loading has been devised for failure characterization. A methodology based on digital image correlation (DIC) used in conjunction with ultra high-speed photography and a long-bar impactor has been developed for determining dynamic crack initiation stress intensity factor (SIF) , as well as SIFs for a rapidly growing crack during high-strain rate events. By altering the material of the pulse shaper, a range of strain rates has been attained. Commercial grade PMMA was first used to calibrate the device, and then dynamic fracture characterization was performed for the first time on PMMA-based bone cement (BC). Despite several key differences, the two materials performed similarly during quasi-static fracture tests; however, under dynamic loading conditions, bone cement exhibited significantly lower crack initiation SIF , lower dynamic SIFs , and higher crack tip velocities for three different dynamic loading rates .
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July 2013
Research-Article
Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement
Hareesh V. Tippur
Hareesh V. Tippur
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Hareesh V. Tippur
Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received April 30, 2012; final manuscript received January 8, 2013; published online April 2, 2013. Assoc. Editor: Jefferey Kysar.
J. Eng. Mater. Technol. Jul 2013, 135(3): 031001 (11 pages)
Published Online: April 2, 2013
Article history
Received:
April 30, 2012
Revision Received:
January 8, 2013
Citation
Bedsole, R., and Tippur, H. V. (April 2, 2013). "Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement." ASME. J. Eng. Mater. Technol. July 2013; 135(3): 031001. https://doi.org/10.1115/1.4023405
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