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Structural sheet and panel
| Details |
Inventors: Seksaria, Dinesh C.; Jarvis, Glenn W.;
Assignee: Aluminum Company of America (Pittsburgh, PA)
Primary Examiner: Zimmerman; John
Assistant Examiner:
Attorney, Agent or Firm: Dressler, Goldsmith, Shore, Sutker & Milnamow, Ltd.
The invention relates to a structural sheet formed with cup-shaped projections in which the sidewalls are formed by a sigmoidal line of revolution to provide for more uniform distribution of stress in the structural sheet. There is also provided a novel two-component structural panel which incorporates the advantages of such a structural element to eliminate depressions in the outer panel member which would present "read through" problems. |
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DETAILED DESCRIPTION The present invention is directed to a structural sheet that can be used in a variety of configurations, and particularly to such a sheet that can be used in a two-component structural panel for use wherever it is desired to have at least one exposed smooth and stiff metallic finished surface and a strong yet light in weight structural support such as for automobile engine hoods, roofs, etc.
It is important that the novel panel structure be light in weight, yet have sufficient strength for its intended use.
It is desirable that this be made in a cost-efficient method utilizing, locally, only a cylindrical punch and die and not require for its formation a more expensive complicated matched die set.
To obtain the desired strength and stiffness, the sheet is formed with a series of projections, which construction is known to provide high strength with minimum weight.
It is particularly important that the shape of the projections be such as to minimize, if not eliminate inordinate stress concentrations in the areas where the sidewalls interconnect to the upper and lower portions of the structural sheet itself and to provide more equal stress distribution throughout the sidewall.
It is to these features that the present invention is directed.
In a typical embodiment the structural panel segment includes spaced flat portions that can be adhesively secured to an outer smooth metallic sheet to which it is to be connected.
While the particular structural panel member can be used in a number of different situations, in a preferred embodiment, it is employed as part of a two-component panel for use with automobiles.
In the particular illustrated embodiment, both of the members are made of a thin-gauge aluminum alloy sheet, but this is by way of example, and the invention is not to be so limited.
Generally speaking, the panel consists of an outer sheet that can be formed in the desired aerodynamic shape and an inner structural member adhesively secured to the outer sheet and providing the majority of the required strength and stiffness
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Metal Working 
