Trabecular Bone Failure Analysis Under Quasi-static Impact
Presentation Type
Poster
Presentation Type
Submission
Keywords
Fractography, Trabecular Bone, Failure Analysis, Offset, Quasi-static Impact
Department
Physics
Major
Biology
Abstract
Fractography has traditionally been used to analyze materials such as glass and ceramics under failure, however, our lab has helped pioneer the application of fractographic analysis to more complicated materials such as bone, in this case 6 porcine trabecular bones. To prepare the bones for analysis, we first dissected to clear away extraneous tissue that would obscure fracture surfaces. Then the bones underwent quasi-static impact, to allow the bone time to react to the stress, with a gravity driven impact device with a blunt tip. After breaking, the bones were then treated with a procedure that included multiple rounds of dying with different concentrations of Basic Fuchsin dye and ethanol, then put through vacuum filtration. We found that the trabecular layer had both brittle and ductile breakage, evidence of both tensile and compressive strength of the trabecular layer, specifically certain trabeculae were found to have past the point of plastic deformation and curled along the direction of applied tensile stress. Furthermore, we also found that the offset, the difference in the fracture of the top and the bottom cortical layer, had a correlation to the thickness of the trabecular layer, such that bones with very thin trabecular layers had almost no offset and those with sufficient thickness demonstrated Hertzian cone offset. All of this combines to demonstrate that the trabecular layer does much more than act as a cushion between the two cortical layers and contributes not only tensile and compressive strength, but demonstrates some load transferring capabilities.
Faculty Mentor
Dr. Mary Holden
Location
Waves Cafeteria
Start Date
22-3-2024 1:30 PM
End Date
22-3-2024 2:30 PM
Trabecular Bone Failure Analysis Under Quasi-static Impact
Waves Cafeteria
Fractography has traditionally been used to analyze materials such as glass and ceramics under failure, however, our lab has helped pioneer the application of fractographic analysis to more complicated materials such as bone, in this case 6 porcine trabecular bones. To prepare the bones for analysis, we first dissected to clear away extraneous tissue that would obscure fracture surfaces. Then the bones underwent quasi-static impact, to allow the bone time to react to the stress, with a gravity driven impact device with a blunt tip. After breaking, the bones were then treated with a procedure that included multiple rounds of dying with different concentrations of Basic Fuchsin dye and ethanol, then put through vacuum filtration. We found that the trabecular layer had both brittle and ductile breakage, evidence of both tensile and compressive strength of the trabecular layer, specifically certain trabeculae were found to have past the point of plastic deformation and curled along the direction of applied tensile stress. Furthermore, we also found that the offset, the difference in the fracture of the top and the bottom cortical layer, had a correlation to the thickness of the trabecular layer, such that bones with very thin trabecular layers had almost no offset and those with sufficient thickness demonstrated Hertzian cone offset. All of this combines to demonstrate that the trabecular layer does much more than act as a cushion between the two cortical layers and contributes not only tensile and compressive strength, but demonstrates some load transferring capabilities.