Abstract
Anisogrid lattice structure, consisting of helical and hoop ribs intersecting each other in a regular pattern, is considered to be a superior candidate as the lightweight and low-cost aerospace structure such as payload attachment adapter and inter-stage structure of launch vehicles. It is also expected that lattice structure has high wave attenuation and vibration damping properties owing to the nodal structure, which additionally motivates us to apply the lattice structure to the launch vehicle structures to reduce the high-level shock loads during the launch and the separation of the spacecraft. In this study, shock propagation behavior of composite lattice structures is experimentally evaluated. Transient responses of CFRP lattice structure by the impact are measured by using accelerometers. The superior wave attenuation property of the composite lattice structures is demonstrated by the comparison with several other structures in the previous references. Moreover, a simplified analytical method for the prediction of the shock responses of lattice structures is presented in this paper. The shock attenuation characteristics of CFRP lattice structure are explained by the analytical predictions.
