Isogrid Stiffener Design

[butelja]

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.

 

[isheikh]

There are few guidelines that deals with the stiffened plates, stiffened in one-direction. The ones that I can recall are:

Det Norske Veritas (DnV) 1995, Classification Notes no. 30.1

American Petroleum Institue (API) Rules of Practice Bulletin 2V (1987).


They provide with various guidelines for stiffened plates for various buckling modes present in these plates, e.g. Plate and stiffener induced overall buckling, plate buckling strength and stiffener tripping strength.

With a trianglar shaped stiffener, I don't think you will be having any problem with stiffener tripping.

 

[butelja]

With the isogrid stiffener, the layout of the stiffeners on the plate to be reinforced is in the form of equilateral triangles. The actual stiffener cross sections are usually bar or tee section. Perhaps my earlier post wasn't clear on this.