公式 1

\begin{array}{l} D = [\begin{matrix} D_{11} & D_{12} & D_{13} & 0 & 0 & D_{16} & D_{17} & D_{18} \\ D_{22} & D_{23} & 0 & 0 & sym . & D_{27} & D_{28} \\ D_{33} & 0 & 0 & sym . & sym . & D_{38} \\ D_{44} & D_{45} & 0 & 0 & 0 \\ D_{55} & 0 & 0 & 0 \\ sym . & D_{66} & D_{67} & D_{68} \\ D_{77} & D_{78} \\ D_{88} \end{matrix}] \\ Bending and Torsion : D_{11} D_{12} D_{13} D_{22} D_{23} D_{33} \\ Shear : D_{44} D_{45} D_{55} \\ Membrane : D_{66} D_{67} D_{68} D_{77} D_{78} D_{88} \\ Eccentricity : D_{16} D_{17} D_{18} D_{27} D_{28} D_{38} \end{array}

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