A porous nanotube network structure of carbon allotrope was designed, denoted as P4/mmm C₉₆. Besides its structure similar to carbon nanotubes, the most interesting thing about P4/mmm C₉₆ is that its band structure is metallic. The shear modulus G, Young’s modulus E, and bulk modulus B of P4/mmm C₉₆ is 49.4 GPa, 128.6 GPa, and 107.8 GPa, respectively. Although the elastic modulus of P4/mmm C₉₆ is low, it is still larger than other carbon allotropes, such as TY-II carbon, TY carbon, fcc-C10, Y carbon, Y-II carbon. The elastic anisotropy in shear modulus G, Poisson’s ratio v, and Young’s modulus E of P4/mmm C₉₆ are larger than that of other C₉₆ carbon allotropes, Finally, the elastic anisotropy of shear modulus of P4/mmm C₉₆ in (1 0 0) plane is the greatest, the elastic anisotropy of E of P4/mmm C₉₆ in (0 0 1) plane is the largest, while the elastic anisotropy in v in (0 0 1) plane is the greatest.

设计了碳同素异形体的多孔纳米管网络结构，记为P 4 / mmm C ₉₆。除了它的结构类似于碳纳米管，P 4/ mmm C ₉₆最有趣的地方在于它的能带结构是金属的。P 4/ mmm C ₉₆的剪切模量G、杨氏模量E和体积模量B分别为49.4GPa、128.6GPa和107.8GPa。虽然弹性模量P 4/ mmm C ₉₆低，但仍大于其他碳同素异形体，如TY-II碳、TY碳、fcc-C10、Y碳、Y-II碳。弹性各向异性剪切模量G ^，泊松比v，和杨氏模量Ë的P 4 / MMM Ç ₉₆是比其他C的大₉₆碳同素异形体，最后，剪切模量的弹性各向异性P 4 / MMM Ç ₉₆在（1  0  0）面是最大的，的弹性各向异性Ë的P 4 / MMM ç ₉₆在（0  0 1)平面最大，而v在(0  0  1)平面内的弹性各向异性最大。