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Isogrid is a type of partially hollowed-out structure formed usually from a single metal plate (or face sheet) with triangular integral stiffening ribs (often called stringers). It is extremely light and stiff. Compared to other materials it is expensive to manufacture, and so it is restricted to spaceflight applications and some particularly critical parts of more general aerospace use. == Theory and design == Isogrid structures are related to sandwich-structured composite panels; both can be modeled using sandwich theory, which describes structures with separated, stiff face sheets and a lighter interconnecting layer. Isogrids are manufactured from single sheets of material and with large-scale triangular openings, and an open pattern to the flanges, compared to closed sheets and foam or honeycomb structures for the sandwich-composite structures. The triangular pattern is very efficient because it retains rigidity while saving material and therefore weight. The term isogrid is used because the structure acts like an isotropic material, with equal properties measured in any direction, and grid, referring to the sheet and stiffeners structure. A similar variant is the Orthogrid which uses rectangular rather than triangular openings. This is not isotropic (has different properties from different angles) but matches many use cases well and is easier to manufacture. Traditionally, the equilateral triangle pattern was used because it was amenable to simplified analysis. Since the equilateral triangle pattern has isotropic strength characteristics (no preferential direction), it was named isogrid. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Isogrid」の詳細全文を読む スポンサード リンク
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