Abstract
A novel kind of lightweight integrated thermal protection system, named pyramidal core sandwich panel, is proposed to be a good safeguard for hypersonic aircrafts in the current study. Such system is considered as not only an insulation structure but also a load-bearing structure. In the context of design for hypersonic aircrafts, an efficient optimization should be paid enough attention. This paper concerns with the homogenization of the proposed pyramidal sandwich core panel using two-dimensional model in subsequent research for material selection. According to the required insulation performance and thermal–mechanical properties, several suitable material combinations are chosen as candidates for the pyramidal core sandwich panel by adopting finite element analysis and approximate response surface. To obtain lightweight structure with an excellent capability of heat insulation and load-bearing, an investigation on some specific design variables, which are significant for thermal–mechanical properties of the structure, is performed. Finally, a good balance between the insulation performance, the capability of load-bearing and the lightweight has attained.
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Abbreviations
- b :
-
Thickness of the lattice-frame (mm)
- \(B_{t}\) :
-
Thickness of the top face sheet (mm)
- C :
-
Specific heat [J/(kg K)]
- E :
-
Young’s modulus (Pa)
- F :
-
Force (N)
- G :
-
Modulus of rigidity (Pa)
- H :
-
Thickness of thermal insulation sample (mm)
- k :
-
Thermal conductivity [\(\hbox {W}/(\hbox {m}\,\hbox {K})\)]
- l :
-
Half the length of the cross in the pyramidal core structure (mm)
- T :
-
Temperature (K)
- \(T_{t}\) :
-
Thickness of the top face sheet (mm)
- t :
-
Thickness of the cross in the pyramidal core structure (mm)
- \(t'\) :
-
Thickness of the upper part of the cross (mm)
- \(q_{r}\) :
-
Local radiation heat flux (W/mm\(^{2}\))
- \(\beta \) :
-
A non-dimensional thermal diffusivity
- \(\sigma \) :
-
Stress (Pa)
- \(\varepsilon \) \(_{ij}\) :
-
displacement (mm)
- \(\gamma \) :
-
Ratio between the rate of the heat conduction and the rate of the thermal energy storage of the homogenized core (–)
- \(\varepsilon \) :
-
Surface emissivity (–)
- \(\mu \) :
-
Poisson’s ratio (–)
- \(\tau \) :
-
Shear stress (Pa)
- \(\theta \) :
-
The inclined angle of lattice-frame (\({}^{\circ }\))
- \(\rho \) :
-
Density (kg/m\(^{3}\))
- i, j :
-
i, j Represent the direction for x, y, z
- r :
-
Radiation
- t :
-
Thickness (mm)
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Communicated by Andreas Öchsner.
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Zhang, R., Zhang, X., Lorenzini, G. et al. Material combinations and parametric study of thermal and mechanical performance of pyramidal core sandwich panels used for hypersonic aircrafts. Continuum Mech. Thermodyn. 28, 1905–1924 (2016). https://doi.org/10.1007/s00161-016-0518-x
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DOI: https://doi.org/10.1007/s00161-016-0518-x