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 .
Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement
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.
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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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