Functionally Graded Thermal Protection Systems for Future Space Vehicles
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 Material Information
Title: Functionally Graded Thermal Protection Systems for Future Space Vehicles
Series Title: Journal of Undergraduate Research
Physical Description: Serial
Language: English
Creator: Behnke, Marlana
Sankar, Bhavani ( Mentor )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: Spring 2010
Abstract: High thermal stresses develop when two different types of materials (such as a metal and ceramic) are bonded together. This is often the case in thermal protection systems (TPS) for reentry vehicles that need to be both insulative and structurally strong. The thermal stresses developed in a two-component composite that gradually changes from one material composition to another, also known as a functionally graded material (FGM), were studied to determine if there are advantages to using an FGM as part of a TPS. Finite element analysis was used to study the heat loads that occur during spacecraft reentry. These heat loads were applied to a three-dimensional finite element model of the FGM composed of 100% aluminum oxide in the top layer and 100% nickel alloy in the bottom layer, with either a linear or an elliptical functional variation between these outermost layers. Thermal stresses and strains were examined to determine the advantages of using an FGM. The study found that using an FGM does allow for material tailoring that will prevent failure. However, prevention of failure in the material is not guaranteed. Using von Mises stress failure criteria, the materials were shown to fail at certain percent compositions. If the sections of the material that failed are removed, failure can be prevented, but the material will not vary from 100% ceramic to 100% metal. It will only vary from 80% metal to 80% ceramic, for example. It is therefore plausible to use an FGM as part of a TPS.
 Record Information
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
System ID: UF00091523:00007

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