2026 年 69 巻 3 号 p. 93-100
Beams consisting of lattice structure with slits for high-accuracy deployable reflectors were developed, and their mechanical characteristics were evaluated through numerical simulations and experiments. In these lattice beams with slits, slit members are placed on the side of the lattice beam where bending deformation is to be restrained. When the beam bends above a predetermined level, the slits close, and the members contact each other, thereby increasing the stiffness of the beam structure and restraining deformation from the predetermined shape. The numerical analyses were conducted by changing the stiffness of the beam material, and it was confirmed that the proposed lattice beam with slits can reduce the sensitivity of the deformation to changes in the stiffness of the beams. Then the model was printed using a 3D printer, and bending experiment was carried. The experimental result shows that the appropriately designed beam structure can be easily bent at low loads up to a designed deformation, and their stiffness increases after the slits are closed. This result indicates that beams for deployable reflectors consisting of these lattice structures deploy easily, and the deformation due to disturbance can be mitigated by increasing the structure’s stiffness after deployment.
