Thermostructural Behavior of a Hypersonic Aircraft Sandwich Panel Subjected to Heating on One Side

Ko, William L. (1997) Thermostructural Behavior of a Hypersonic Aircraft Sandwich Panel Subjected to Heating on One Side. Technical Report NASA TM-4769, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

Thermostructural analysis was performed on a heated titanium honeycomb-core sandwich panel. The sandwich panel was supported at its four edges with spar-like substructures that acted as heat sinks, which are generally not considered in the classical analysis. One side of the panel was heated to high temperature to simulate aerodynamic heating during hypersonic flight. Two types of surface heating were considered: (1) flat-temperature profile, which ignores the effect of edge heat sinks, and (2) dome-shaped-temperature profile, which approximates the actual surface temperature distribution associated with the existence of edge heat sinks. The finite-element method was used to calculate the deformation field and thermal stress distributions in the face sheets and core of the sandwich panel. The detailed thermal stress distributions in the sandwich panel are presented, and critical stress regions are identified. The study shows how the magnitudes of those critical stresses and their locations change with different heating and edge conditions. This technical report presents comprehensive, three-dimensional graphical displays of thermal stress distributions in every part of a titanium honeycomb-core sandwich panel subjected to hypersonic heating on one side. The plots offer quick visualization of the structural response of the panel and are very useful for hot structures designers to identify the critical stress regions.

EPrint Type:	NASA Technical Memorandum
Keywords:	Heat-sink effect, One-sided heating, Sandwich panels, Thermal deformations, Thermal stress analysis, Thermal stress distributions
Subjects:	(31 - 39) Engineering: (39) Structural Mechanics
ID Code:	106
Deposited On:	03 June 2004
Additional Information:	53 pages.