Tortuosity Index Based on Dynamic Mechanical Properties of Polyimide Foam for Aerospace Applications

被引:24
作者
Flores-Bonano, Sugeily [1 ]
Vargas-Martinez, Juan [1 ]
Suarez, Oscar Marcelo [2 ]
Silva-Araya, Walter [3 ]
机构
[1] Univ Puerto Rico, Dept Mech Engn, Mayaguez, PR 00681 USA
[2] Univ Puerto Rico, Dept Engn Sci & Mat, Mayaguez, PR 00681 USA
[3] Univ Puerto Rico, Dept Civil Engn, Mayaguez, PR 00681 USA
基金
美国国家科学基金会;
关键词
tortuosity index; polyimide foam; PolyuMAC(TM); aerospace material; OPEN-CELL FOAMS; DIFFUSION; POROSITY;
D O I
10.3390/ma12111851
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
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页数:17
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