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Development of Polyimide Foam for Aircraft Sidewall Applications
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Author and Affiliation:
Silcox, Richard(NASA Langley Research Center, Hampton, VA, United States);
Cano, Roberto J.(NASA Langley Research Center, Hampton, VA, United States);
Howerton, Brian M.(NASA Langley Research Center, Hampton, VA, United States);
Bolton, J. Stuart(Purdue Univ., School of Mechanical Engineering, West Lafayette, IN, United States);
Kim, Nicholas N.(Purdue Univ., School of Mechanical Engineering, West Lafayette, IN, United States)
Abstract: In this paper, the use of polyimide foam as a lining in double panel applications is considered. It is being investigated here as a replacement for aircraft grade glass fiber and has a number of attractive functional attributes, not the least of which is its high fire resistance. The test configuration studied here consisted of two 1mm (0.04 in.) thick, flat aluminum panels separated by 12.7 cm (5.0 in.) with a 7.6 cm (3.0 in.) thick layer of foam centered in that space. Random incidence transmission loss measurements were conducted on this buildup, and conventional poro-elastic models were used to predict the performance of the lining material. Results from two densities of foam are considered. The Biot parameters of the foam were determined by a combination of direct measurement (for density, flow resistivity and Young s modulus) and inverse characterization procedures (for porosity, tortuosity, viscous and thermal characteristic length, Poisson s ratio and loss factor). The inverse characterization procedure involved matching normal incidence standing wave tube measurements of absorption coefficient and transmission loss of the isolated foam with finite element predictions. When the foam parameters determined in this way were used to predict the performance of the complete double panel system, reasonable agreement was obtained between the measured transmission loss and predictions made using a commercial statistical energy analysis code.
Publication Date: Jan 07, 2013
Document ID:
20130003309
(Acquired Jan 28, 2013)
Subject Category: COMPOSITE MATERIALS
Report/Patent Number: AIAA Paper 2013-0213, NF1676L-14893
Document Type: Conference Paper
Meeting Information: 51st AIAA Aerospace Sciences Meeting; 7-10 Jan. 2013; Grapevine, TX; United States
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Contract/Grant/Task Num: WBS 432938.11.01.07.43.24.01
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 11p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: FOAMS; POLYIMIDES; LININGS; PANELS; MECHANICAL PROPERTIES; AIRCRAFT STRUCTURES; WALLS; TRANSMISSION LOSS; MODULUS OF ELASTICITY; STIFFNESS MATRIX; SCANNING ELECTRON MICROSCOPY; FREQUENCY DISTRIBUTION; FLOW RESISTANCE
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