Spearing, S. Mark
Design diagrams for reliable layered materials
AIAA Journal, 35, (10), .
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Many components and structures consist of two or more layers of dissimilar materials bonded together over
areas that are large relative to the layer thickness. A methodology is presented that is appropriate for designing
against failure due to thermomechanical loading in these systems. Results are presented for the fracture of twol ayered
systems of elastic materials under uniform thermal loading. In such a system of two or more materials,
failure occurs as the result of four competing fracture modes. This competition is assessed, and the conditions
are identifed for one fracture mode to occur in preference to the others. The results are presented as fracture
mechanism diagrams, which give easily interpreted guidance for the design andmanufacture of layeredmaterials.
The same graphical format can be used to map performance metrics relevant to functional requirements other
than reliability, such as heat flow, curvature, andmass per unit area. These diagrams are potentially useful for the
preliminary design of components with multiple performance requirements.
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