isogrid stiffeners

huangyhg

isogrid stiffeners
does anyone know of a good reference on the design and analysis of plates stiffened with isogrid (equilateral triangle) stiffeners?  plates stiffened with such stiffeners have isotropic behavior, rather than orthotropic behavior that rectangular stiffened plates have.  i'm looking for design guidelines that can be used for preliminary hand calculations, not a detailed treatise on nonlinear fea optimization.  thanks.
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hi,
the best (and only) source that i know of is a document entitled "isogrid design handbook" written in 1973 by mcdonnell aircraft co. for nasa.  the document number is nasa-cr-124075.  go to