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Metallic Bone Plate Testing
Bone plates are tested to determine their strength, equivalent bending stiffness and ductility. This in vitro test is used to measure the mechanical response of bone plates to a specific type of bending load. The bending strength is equivalent to the amount of bending movement that can be applied to the bone plate before measurable and permanent bending occurs. Metal bone plates are subjected to a four-point bending load. Load is applied until a specified value of deformation of the loading points is attained. The plate's equivalent bending stiffness is derived from the elastic load versus the deformation behaviour and the test configuration. The bending strength is related to the development of significant permanent deformation. Ductility is assessed by examining the surface of the bent specimen for cracking.
The Lloyd Instruments test system will display a load versus deformation curve with tabular results for the test material as well as reporting bending strength and equivalent bending stiffness. The system can generate the analysis report including offset, proof strength, mean, standard deviation of bending strength values, mean and standard deviation of the equivalent bending stiffness, etc.
Industry standards for determining metallic bone plate bending strength
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