SPF/DB Titanium Sandwich Panel for Hypersonic Thermal Loads
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Solution Overview
Problem
Current thermal management strategies for hypersonic vehicles are inadequate, as traditional materials like nickel alloys are heavy, expensive, and non-reusable, failing to effectively manage high heat flux at supersonic speeds.
Innovation Solution
A superplastic formed and diffusion bonded (SPF/DB) sandwich structure with a multicellular core and a superplastic formable reinforcement (SFR) layer underlying the exterior skin, which is configured to support the skin and provide tensile and compressive strength, using materials like titanium-zirconium-molybdenum (TZM) or Incoloy 909 alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional thermal protection materials (nickel alloys, ceramic tiles) are used for hypersonic vehicles, then thermal management capability is improved, but weight increases and reusability is lost
Solution Approach 1:
The patent employs a composite structure consisting of a titanium alloy exterior skin, a multicellular core, and an SFR layer. This composite construction achieves superior thermal management at hypersonic speeds while maintaining lightweight properties, as the titanium alloy exterior skin provides heat resistance and the multicellular core offers thermal insulation without the weight penalty of traditional nickel alloys or ceramic tiles.
2Temperature
If traditional thermal protection materials are used, then thermal management is improved, but manufacturing cost increases
Solution Approach 1:
The composite structure using titanium alloy exterior skin, multicellular core, and SFR layer provides effective thermal management while being more cost-effective than traditional nickel alloys or ceramic tile systems. The standardized SPF/DB manufacturing process further reduces production costs through automation and material efficiency.
Solution Approach 2:
The patent utilizes superplastic forming parameters (temperature, pressure, time) to create complex multicellular core structures from thin sheets, reducing material usage and manufacturing cost compared to traditional thick-section thermal protection systems.
3Temperature
If traditional thermal protection is used, then thermal management is improved, but reusability is reduced
Solution Approach 1:
The titanium alloy-based composite structure demonstrates superior reusability compared to ceramic tiles or ablative materials. The metallic composite can withstand multiple hypersonic flights with thermal loads, maintaining structural integrity and thermal management capability across repeated use cycles.
4Weight of moving object
If SPF/DB sandwich structure with SFR layer is used, then weight is reduced and cost is lowered, but thermal management capability must be maintained
Solution Approach 1:
The SPF/DB sandwich structure with titanium alloy exterior skin, multicellular core, and SFR layer achieves optimal weight reduction while maintaining thermal management capability. The exterior skin provides heat resistance, the multicellular core delivers thermal insulation, and the SFR layer reinforces structural integrity under thermal loading.
Solution Approach 2:
The SFR layer is strategically positioned beneath the exterior skin at locations requiring enhanced thermal and structural performance, providing localized reinforcement without adding unnecessary weight to the entire structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The SPF/DB structure provides a lightweight, cost-effective, and reusable thermal management solution capable of withstanding high temperatures, maintaining structural integrity and reducing material costs while accommodating hypersonic speed conditions.
Implementation Method 1
an exterior skin of a superplastic material configured for atmospheric exposure
Implementation Method 2
superplastic formed and diffusion bonded (SPF/DB) the skins and layers
Data Source
AI summary
An exterior panel is formed of superplastic materials, including an exterior skin of titanium to accommodate high thermal stresses imposed on hypersonic transport vehicles during hypersonic flight. The exterior skin is fixed to an underlying reinforcing skeletal structure consisting of a superplastic formable reinforcement (SFR) layer, for example a titanium, zirconium, and molybdenum (TZM) alloy, which supports the exterior skin whenever the latter may be heated to temperatures exceeding 1200 degrees Fahrenheit. The exterior panel includes a separate interior skin configured for attachment to a frame member such as a rib, stringer, or spar of the hypersonic transport vehicle. A multicellular core is sandwiched between the exterior and interior skins to impart tensile and compressive strength to the exterior panel. In one disclosed method, the core is superplastic formed and diffusion bonded to the exterior and interior skins.