Tortuosity index based on dynamic mechanical properties of polyimide foam for aerospace applications Flores-Bonano, Sugeily Vargas-Martinez, Juan C. Suárez, Oscar Marcelo Silva-Araya, Walter College of Engineering en_US
dc.contributor.department Department of Materials Science and Engineering en_US 2021-11-01T21:22:52Z 2021-11-01T21:22:52Z 2019-06-07
dc.description.abstract The determination of a reliable tortuosity index is lacking in the aerospace industry. Therefore, a methodology is formulated via direct and indirect characterization methods of a fluid-filled porous media. Chemical, thermal, and mechanical characterization was performed to the PolyuMAC(TM) polyimide foam. Tortuosity was measured considering a pressure difference as the resistivity variable, rather than electrical resistivity or molecular diffusivity, as proposed on previous models. This is an empirical establishment of the tortuosity index considering the correlation among hydraulic and structural dimensionless parameters obtained through the Buckingham’s Pi theorem. The behavior of the polyimide was studied for samples of different lengths compressed at 30%, 60%, and 90% of its original length on the foaming direction. Results show that, porosity, sample length, and fluid viscosity are relevant for the insulation performance of the material. Regression analysis produced a significant statistical model fit to the data correlated from the dimensionless parameters for each dynamic compression series. en_US
dc.description.sponsorship Funding from the Puerto Rico Space Grant Consortium (PRSGC) NASA Ideas Program was critical for the completion of this project. This material is based upon work partly supported by the National Science Foundation under Grant No. 13456156 (CREST program). en_US
dc.identifier.issn 1996-1944
dc.language.iso en en_US
dc.publisher MDPI en_US
dc.rights Attribution-NonCommercial-ShareAlike 3.0 United States *
dc.rights.holder (c) 2019 Sugeily Flores-Bonano, Juan C. Vargas-Martinez, Oscar Marcelo Suárez, and Walter Silva-Araya en_US
dc.rights.uri *
dc.source.uri en_US
dc.subject Tortuosity index en_US
dc.subject Polyimide foam en_US
dc.subject PolyuMAC(TM) en_US
dc.subject Aerospace material en_US
dc.title Tortuosity index based on dynamic mechanical properties of polyimide foam for aerospace applications en_US
dc.type Article en_US
dspace.entity.type Publication
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