![]() ![]() William Case at the e-mail address provided at the top and bottom of this page.Ī Microsoft Excel spreadsheet is provided to calculate the section properties and PSHELL input values. If you are interested in the math, please contact Dr. The derivation of the necessary equations is not included here. With these values it is possible to calculate the overall section properties of the isogrid plate and NASTRAN PSHELL input values. The flange is shown as a hidden line through the face sheet. The figure below shows the top view of a single isogrid cell. ![]() While other types of rib patterns can also be designed, e.g., square or rectangular, the triangular pattern is the only true isogrid. The first figure shows the rib pattern for an isogrid plate. ![]() The term isogrid is used because the structure acts like an isotropic material. The triangular pattern was found to be very efficient because it takes advantage of the fact that triangular trusses are very effecient structures. Download the MS Excel spreadsheet ISOGRID.xls - 26KBĪn Isogrid panel is a plate (or face sheet) with triangular integral stiffening ribs (often called stringers). ( NASA Technical Report webpage for the design reference.) Reference: Isogrid Design Handbook - NASA CR-124075, Rev. ![]()
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