Science and Technology to Aid the Handicapped
نویسنده
چکیده
This proposed research program will seek to learn the failure mechanisms of multidirectionally woven carbon-carbon composites when subjected to fatigue leading, and characterize this material's potential for use in internal prosthetic devices, e .g . hip and knee implants . Carbon-carbon composites are graphite fiber bundles embedded in a carbon matrix . Currently, implants are made of metals such as titanium and stainless steel which are cemented into the bone . In a hip implant, for instance, a portion of the bond can break down at the top of the femur resulting in high stresses at the base of the implant and a fatigue failure . It is also desirable to match the implant mechanical properties to those of the replaced bone—a difficult task with metals . Carbon-carbons have three potential advantages for this application : (i) Their strength and stiffness can be tailored by proper selection of fibers, fiber orientation, and fiber volume fraction ; (ii) carbon is biocompatible ; and (iii) carbon-carbon composites are porous, so anchoring may be achieved by tissue ingrowth. Our major objectives in this Phase I program are: 1. To discover failure mechanisms and fatigue strengths of a typical fineweave 3D carbon-carbon to determine which parameters (density, matrix pocket shapes, etc .) bear most heavily on fatigue life . Where is the breakdown occurring and at what stress level, cycle, etc .? 2. To make a quantitative assessment on the suitability of multi-directional carbon-carbons for implants from a viewpoint of strength and fatigue properties. To date, multidirectional carbon-carbons have been used primarily for high temperature aerospace applications such as missile nosetips and rocket nozzles . Since fatigue behavior is not a consideration for those applications, little work has been done in this area. If this preliminary work shows a potential for carbon-carbon, follow-on effort will focus on all the design parameters for specific applications such as hip or knee implants.
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تاریخ انتشار 2009