Evaluation of High Temperature Knitted Spring Tubes for Structural Seal Applications

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

doi:10.2514/6.2004-3890

Cited by 13 publications

(6 citation statements)

References 3 publications

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“…The outer layer of the structure is Nextel fiber braided casing. The middle is an Inconel-750 superalloy wire braided spring tube, and the inner layer is filled with Saffil alumina fiber, which can be prepared into a flexible long strip structure and can adapt to a variety of complex corner clearances [11]. Bruce et al [12] and Taylor et al [13] studied the temperature resistance and durability of the high-temperature braided rope seal.…”

Section: Introductionmentioning

confidence: 99%

Thermal insulation characteristics of high-temperature heat seals for hypersonic aero-engines

Li,

Cai,

et al. 2023

J. Phys.: Conf. Ser.

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The high-temperature baseline sealing thermal protection technology is of great significance to realizing hypersonic aero-engines and aircraft. Based on the fact that there are few studies on the high-temperature baseline heat sealing in the ultra-high temperature environment (above 1000 °C), the paper establishes a simulation model to analyze the influence of different characteristic parameters on the thermal protection performance of the heat seal at ultra-high temperature and carried out experiments. Verification, simulation, and experiment error are less than 6%. The research results show that the aluminum silicate fiber has the best thermal insulation effect in the material of the inner thermal insulation layer, and the temperature can be lowered by more than 900 °C under an environment of 1200 °C. It is used to prepare heat seals. In addition, the filling density and thickness of the inner thermal insulation layer have little influence on the thermal insulation effect, and the influence coefficient does not exceed 5%. In the test of the degree of degradation of the thermal insulation performance of the heat seal, it is found that it does not exceed 5%, which meets the requirements for use. This paper further promotes the development of high-temperature thermal protection technology. It can also provide a corresponding technical basis for developing supersonic aero-engines.

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Section: Introductionmentioning

confidence: 99%

Thermal insulation characteristics of high-temperature heat seals for hypersonic aero-engines

Li,

Cai,

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…To have a robust guarantee for protecting internal structures from heat transfer, the ceramic parts should avoid exhibiting significant loss of resiliency below 1000°C ~ 1200°C. 1,2 Some typical parts such as ceramic springs for high-temperature sealing gain abundant attentions from researchers. 3,4 However, the manufacturing of ceramic springs faces a series of defects like being restricted by mold, costing a lot and having a complex processing.…”

Section: Introductionmentioning

confidence: 99%

Application of artificial neural network optimization for resilient ceramic parts fabricated by direct ink writing

Fan

Feng

Yang

et al. 2019

Int J Applied Ceramic Tech

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Geometries of ceramic parts for high-temperature sealing have great influence on their compression-resilience behaviors. In this work, an accurate and large-scale artificial neural network (ANN) was established to match the relationship between structural parameters and mechanical properties of ZrO 2 parts fabricated by 3D printing. Four geometry parameters of the designed ZrO 2 parts were imported as input and apparent Young's modulus and maximum deformation simulated by finite element method (FEM) were imported as output. FEM calculation provided 400 groups of data for the training of ANN, which greatly improved the predicted accuracy of the network. The predicted results show the mechanical performance of the parts with a range of modulus from 9.24 × 10 −3 GPa to 100.35 × 10 −3 GPa and a range of maximum deformation from 2.32% to 5.80% can be forecasted with error less than 8%. Based on the optimized structural parameters, the designed ZrO 2 parts were fabricated by Direct Ink Writing (DIW) technique. The experimental compressionrebound property is comparable to that of ANN prediction. It demonstrates that the combined method of ANN and FEM is a preferable way to optimize the structure and guide the fabrication of complex ceramic parts by 3D printing method. K E Y W O R D Sadditive manufacturing, artificial neural network, finite element analysis, sealing 218 | FAN et Al. where N is the number of output, y n is the predicted value of the n th item, d n is the target value of the n th , and Q is the number of training cycle. Then the 400 groups of data were divided randomly into three parts: training groups, validation groups, and test groups with the ratio of 70%, 15%, and 15%. The network would stop training when the MSE of validation did not decrease continuously more than six times, otherwise the network was not good at generalization. Similarly, the network would also stop training when the training epochs came to 100 or the value of MSE was less than 0.00001.

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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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Evaluation of High Temperature Knitted Spring Tubes for Structural Seal Applications

Cited by 13 publications

References 3 publications

Thermal insulation characteristics of high-temperature heat seals for hypersonic aero-engines

Thermal insulation characteristics of high-temperature heat seals for hypersonic aero-engines

Application of artificial neural network optimization for resilient ceramic parts fabricated by direct ink writing

An Evaluation of High Temperature Airframe Seals for Advanced Hypersonic Vehicles

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