find suitable materials to for a fracture plate. The parameters to select from are compressive…

Based on the information below, find suitable materials to for a fracture plate. The parameters to select from

are compressive strength, Young’s modulus, and fracture toughness.

A fracture plate is a fixation device that is screwed to a broken bone to facilitate healing. It is fully contained

within the body, is permanent and requires open surgery on the limb in question. The aim is to select a

suitable material or materials for a fracture plate. To do this we compare the properties of bone with those of

non-biological bio-medical materials.

The bones of the scull and limbs generally take the form of bi-structured shells or tubes with an outer layer of

dense, cortical (or compact) bone surrounding a foam-like structure of cancellous (trabecular or spongy) bone.

Ideally, the properties of the material for the plate should match those of bone, meaning a compressive strength

in the range 109-208 MPa and a Young’s modulus >22.4 GPa, typical of the femur, humerous, or tibia. Property

matching is important to avoid bone resorption because an overly stiff plate will take a disproportionate fraction

of the load; the body reacts by reabsorbing the lightly loaded bone – a problem encountered also with hip

implants. You want a material that would not be susceptible to fracture so you need to impose a limit for ????????????

therefore, limit this property to a minimum of 60???????????? · ????0.5.

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