Further Investigations of High Temperature Knitted Spring Tubes for Advanced Control Surface Seal Applications

Taylor, Shawn C.; DeMange, Jeffrey J.; Dunlap, Patrick H.; Steinetz, Bruce M.

doi:10.2514/6.2005-4154

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Among them, the best compression interval is 5%-25%, the compression rate is controlled within this interval, the best sealing effect. In 2006, NASA studied braided metal spring tubes in thermal barrier seals [17], and the thermal barrier seal material and metal spring tubes are shown in Figure 7. Its main purpose as an elastic structural support for the seal is to enhance the seal resilience at high temperatures [18] and effectively prevent the seal from crushing to produce permanent deformation, leading to seal failure.…”

Section: Progress In International Researchmentioning

confidence: 99%

“…The test results showed that Nextel 440 seals had better load retention than Nextel 312, with load retention of 35%-40% and 19%-20% for the two samples to be tested, respectively, and an average reduction in leakage values of about 10%-20% for specimen 440, due to the slightly higher filling density of 440 compared to 312. In addition, hightemperature alloy seals suitable for dynamic sealing applications have been optimized by finite element techniques [25][26][27][28][29][30][31][32]. Three types of studies were conducted on the hatch heat seal, namely, the effect of whether the P-ring is dipped in rubber on the seal, the problem of permanent deformation of the P-ring at different locations of the hatch, the analysis of the effect of whether the P-ring is perforated on the leakage, and the analysis of other influencing factors.…”

Section: Progress In International Researchmentioning

confidence: 99%

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A Review of the Development of Sealing Materials and Measurement and Control Simulation Technology for Typical Hypersonic Vehicle Positions

Guo

Chen

Zhou

2022

Proceedings of the 2022 International Conference on Smart Manufacturing and Material Processing (SMMP2022)

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Hypersonic vehicles are an important development direction in aerospace, and their development will have a significant impact on world security, the development of cosmic space resources and related disciplines. Along with the rapid development of modern aircraft, landing gear is commonly used with retractable technology, which brings a series of problems, such as the design of landing gear hatch retraction heat sealing mechanism and the evaluation of air tightness. This paper takes the thermal sealing structure of the front main landing gear hatch of a vehicle as an example, reviews the progress of the analysis techniques of sealing material properties and sealing structure design for hypersonic vehicles at home and abroad, discusses the current status of the development and limitations of hatch thermal sealing technology, outlines and discusses the key technologies for design and analysis of hatch thermal sealing structure and the future development trend, and summarizes the test equipment and methods for identifying the performance of seals and sealing systems.

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Section: Progress In International Researchmentioning

confidence: 99%

Section: Progress In International Researchmentioning

confidence: 99%

A Review of the Development of Sealing Materials and Measurement and Control Simulation Technology for Typical Hypersonic Vehicle Positions

Guo

Chen

Zhou

2022

Proceedings of the 2022 International Conference on Smart Manufacturing and Material Processing (SMMP2022)

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“…Among the various thermal sealing structures, ceramic wafer seal structure 1 has excellent thermal protection effect. The general requirements of ceramic wafer sealing materials include low density, low thermal conductivity, low hardness, high strength, high Young's modulus, low shear modulus, and good high temperature stability 2 . Table 1, 3‐7 lists the current candidate materials in ceramic wafer seal structure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal properties of light weight boron‐mullite Al₅BO₉

et al. 2020

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Al5BO9 is a promising thermal sealing material for hypersonic vehicles due to its low density, theoretically predicted low shear modulus, and low thermal conductivity. However, experimental investigations on the mechanical and thermal properties of bulk Al5BO9 have not been carried out. Herein, we report the mechanical and thermal properties of bulk Al5BO9 prepared by spark plasma sintering of solid‐state reaction synthesized Al5BO9 powders. The bulk (B), shear (G), and Young's (E) moduli are 148 GPa, 85 GPa, and 214 GPa, respectively, which are close to the theoretical values. The Pugh's ratio G/B is 0.574, indicating its intrinsic damage tolerance, which is also revealed by Hertzian contact test. The Vickers hardness (Hv) is 10.8 GPa, being lower than mullite. The flexural strength, compressive strength, and fracture toughness are, respectively, 277 ± 35 MPa, 814 ± 75 MPa, and 2.4 ± 0.3 MPa·m1/2, which are close to those of mullite. Al5BO9 has anisotropic coefficient of thermal expansion (CTE) in three crystallographic directions, ie αa = (4.40 ± 0.21) × 10−6 K−1, αb = (7.11 ± 0.18) × 10−6 K−1, αc = (6.70 ± 0.29) × 10−6 K−1 from Debye temperature to 1473 K, which are underpinned by its structural feature, ie lower αa is resulted from the edge‐shared AlO6 octahedron chains along the [100] direction. The average CTE is (6.05 ± 0.06) × 10−6 K−1. The thermal conductivity declines with temperature as κ = 1336.39/T + 1.97, consisting with predicted trend from Slack's model. The low thermal conductivity and low density guarantee Al5BO9 a promising candidate as ceramic wafer in the seal structure for hypersonic vehicles.

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“…Previous research at GRC demonstrated a marked improvement in resiliency of the spring tube when René 41 (ATI Properties, Inc., Monroe, NC) wire was used as a replacement for the Inconel X-750. 1,2 Additional testing on a full construction seal design incorporating the René 41 spring tube also exhibited some enhancement, though not to the degree observed with the spring tube by itself. 3 A ceramic wafer seal has also been under development for several years at GRC (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of High Temperature Airframe Seals for Advanced Hypersonic Vehicles

DeMange

Dunlap

Steinetz

et al. 2007

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Further Investigations of High Temperature Knitted Spring Tubes for Advanced Control Surface Seal Applications

Cited by 4 publications

References 5 publications

A Review of the Development of Sealing Materials and Measurement and Control Simulation Technology for Typical Hypersonic Vehicle Positions

A Review of the Development of Sealing Materials and Measurement and Control Simulation Technology for Typical Hypersonic Vehicle Positions

Mechanical and thermal properties of light weight boron‐mullite Al₅BO₉

An Evaluation of High Temperature Airframe Seals for Advanced Hypersonic Vehicles

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Further Investigations of High Temperature Knitted Spring Tubes for Advanced Control Surface Seal Applications

Cited by 4 publications

References 5 publications

A Review of the Development of Sealing Materials and Measurement and Control Simulation Technology for Typical Hypersonic Vehicle Positions

A Review of the Development of Sealing Materials and Measurement and Control Simulation Technology for Typical Hypersonic Vehicle Positions

Mechanical and thermal properties of light weight boron‐mullite Al5BO9

An Evaluation of High Temperature Airframe Seals for Advanced Hypersonic Vehicles

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Product

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Mechanical and thermal properties of light weight boron‐mullite Al₅BO₉