Abstract:One of the disadvantages of honeycomb sandwich structure is that they are prone to fluid intrusion. The purpose of this study is to determine if the structural properties of honeycomb core are affected by contact with a fluid. The test specimens were manufactured of fiberglass prepreg for the facesheets and Nomex ® honeycomb core for the core material in accordance with ASTM C-365/365M. Test specimens were soaked in several different kinds of fluids, such as aircraft fuel, turbine engine oil, hydraulic fluid, … Show more
“…Following that, it is a crushing stage with the load being increased. 7,27 The test is terminated at a displacement of 8 mm and the specimen is not compressed to the densification stage because of the mean compressive strength was the main focus in this study.Figure 5.The typical experimental load-displacement curve of PPHC under flatwise compression: (a) the full curve; (b) the local amplification of curve.…”
Poly ( p-phenylene benzoisoxazole) (abbreviation: PBO) paper honeycomb core (PPHC) is gradually being used as a novel honeycomb material for lightweight structures in high temperature environment. However, compressive properties of PBO paper can hardly be obtained accurately due to the thin thickness and easy-to-buckling of the paper. Therefore, the Short Span Test Method is applied to obtain the compressive strength of PBO paper. The compressive strength and failure of PBO paper are characterized experimentally for the first time. The strength of compression is then used in theoretical formula to study the compressive behaviors of PPHC and the reasonable agreement with the experimental results indicates the validity of the compressive strength. Furthermore, the failure mode of PPHC subjected to compressive loads is obtained, which presents the importance of the accurate characterization on the compressive strength of PBO paper.
“…Following that, it is a crushing stage with the load being increased. 7,27 The test is terminated at a displacement of 8 mm and the specimen is not compressed to the densification stage because of the mean compressive strength was the main focus in this study.Figure 5.The typical experimental load-displacement curve of PPHC under flatwise compression: (a) the full curve; (b) the local amplification of curve.…”
Poly ( p-phenylene benzoisoxazole) (abbreviation: PBO) paper honeycomb core (PPHC) is gradually being used as a novel honeycomb material for lightweight structures in high temperature environment. However, compressive properties of PBO paper can hardly be obtained accurately due to the thin thickness and easy-to-buckling of the paper. Therefore, the Short Span Test Method is applied to obtain the compressive strength of PBO paper. The compressive strength and failure of PBO paper are characterized experimentally for the first time. The strength of compression is then used in theoretical formula to study the compressive behaviors of PPHC and the reasonable agreement with the experimental results indicates the validity of the compressive strength. Furthermore, the failure mode of PPHC subjected to compressive loads is obtained, which presents the importance of the accurate characterization on the compressive strength of PBO paper.
“…There are many studies that report relationships between the moisture content and composite structures [8]. It has been found that the delamination area and the number of transverse cracks of wet specimens are smaller, due to the buffering effect of water absorption [9].…”
New commercial and military aircraft components are often manufactured using advanced composite materials. Fuel is stored in the wing and horizontal tail structures of aircraft for prolonged periods of time. The use of alternative turbine engine fuels as substitutes for such kerosene-based fuels as Jet-A is increasing steadily. However, the studies related to effects of the fuels on the composite structure of aircraft are limited in number. This research was meant to investigate the effects that contacting alternative turbine fuels might have on the mechanical properties of a composite structure. Three different test settings were prepared -0 and 90° orientation tensile and a modified wedge ones. An IM7 8552 unidirectional carbon fiber/epoxy prepreg was used to manufacture test specimens. They were soaked in various kinds of turbine engine fuels: neat Jet-A, 50/50 blend of Jet-A and hydroprocessed renewable jet (HRJ) (Jet-A/HRJ), Fischer-Tropsch (FT), 50/50 blend of synthetic jet fuel S8 and Fischer-Tropsch (FT) (S8/FT), hydrogenated esters and fatty acids (HEFA) fuels, and synthesized iso-paraffin fuels (SIP) for a period of 45 days and then tested. The test data obtained were analyzed to detect any significant degradation of the mechanical properties of test specimens.
“…Hasil ini juga diperkuat dengan jurnal penelitian [8] dimana spesimen yang lebih kering menghasilkan data yang lebih besar. Pengeringan menggunakan suhu ruang kurang efektif digunakan dikarenakan masih memungkinkan adanya sisa uap air/solvent (moisture) yang masih terjerembap pada core.…”
Penggunaan komposit sebagai pengganti material logam dalam bidang rekayasa sudah semakin banyak digunakan salah satunya panel komposit dengan struktur sandwich. Core pada komposit sandwich memiliki peranan penting sebagai penopang dari skin yang digunakan. Pengujian ini bertujuan untuk mengetahui nilai kekuatan tarik flatwise dari variasi yang digunakan beserta pengaruhnya. Pengujian yang dilakukan adalah uji flatwise (ASTM C297). Hasil uji flatwise dengan nilai tertinggi ada pada variasi pembersihan menggunakan spray MEK, pengeringan menggunakan suhu ruang, dan bonding menggunakan tablepress dengan nilai rata-rata 5,67 MPa. Dari variasi yang digunakan, keseluruhannya memberikan pengaruh pada hasil pengujian.
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