Accession Number : ADA622587


Title :   Development of New Generation of Perspireable Skin


Descriptive Note : Final rept. 15 Jun 2011-14 Nov 2014


Corporate Author : MICHIGAN STATE UNIV EAST LANSING DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Kwon, Patrick


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a622587.pdf


Report Date : 20 Feb 2015


Pagination or Media Count : 23


Abstract : This research work aims at the development of the autonomous, self-cooling multi - functional material systems. Similar to our skin that maintains our body temperature, the proposed material system will react to the external heat and open itself for the purpose of self - cooling. Thus, we have coined the term, Perspirable Skin. The autonomous, self-regulating action of the skin comes from the inherent, unique capacity of each material in response to a temperature change . The wide spectrum of the changes in a variety of materials is harnessed to create the openings for self - cooling. In the previously funded program , this concept mainly has relied upon the in - plane de formations on the surface plane of the skin and has limited capacity for self - cooling. This propos ed work intends to explore the possibility of achieving the out - of the plane deformation that can expel a much larger volume of the compressed gas onboard, thus achieving the high capacity for self - cooling. When this happens, the compressed air blankets the surface to prevent frictional heating as a similar technology was found to be incredibly effective in permanent holes on turbine blade . In particular, three approaches are being considered to create considerable out - of - plane deformations for high capacity of self - cooling; (1) Designed thermal deformation, (2) Buckling caused by thermal loading and (3) A hinged structure triggered by intern al pressure . All of these approaches must work with the thermal gradient loading prevalent in such application. At the beginning of the project, the first approach has been undertaken with modest gain in the cooling capacity. Even though the second and third approaches required precision machining capacity - which the request for DURIP has been discouraged due to the budgetary constraint , we were able to work on the development of a material system for the second approach.


Descriptors :   *SKIN(STRUCTURAL) , *THERMAL EXPANSION , AERODYNAMICS , BLADES , CAPACITY(QUANTITY) , CHEMICAL REACTIONS , COMPRESSED AIR , COMPUTERIZED SIMULATION , COOLING , DECOMPOSITION , DEFORMATION , FRICTION , HIGH TEMPERATURE , INTERFERENCE , OXIDES , PRECISION FINISHING , RESPONSE , TEMPERATURE CONTROL , TEMPERATURE GRADIENTS , TENSILE STRENGTH , ZIRCONIUM COMPOUNDS


Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE