Numerical Simulation of Impact Effect of Windborne Spherical Debris on Roof Tiles

Abstract:

A typical spherical concrete flying object was selected to study its impact effect on a typical roof clay tile. Based on ANSYS/LSDYNA and dropball impact experiment, a finite element model was established to study the impact effect of windborne spherical concrete debris on a clay roof tile. The JohnsonHolmquistCeramic constitutive model was chosen to simulate the mechanical properties of clay roof tiles, the element strain failure criteria were introduced to simulate the breakage of tile, and the explicit dynamic algorithm was used to study the time history of the tile stress, strain and deformation during the dropball experiment. The impact effect of tile inclination angle, sphere impact velocity and mass were analyzed. The results show that the maximum von mises stress of the tile is approximately proportional to both the impact velocity and the sphere mass. By contrast, the stress is unrelated to the tile inclination angle. The energy transfer during the process of impacting was remarkable, and the clay roof tile can endure the impact effect of the spherical concrete debris when the wind speed is less than 34.35 m?s-1 according to the function.

Key words:roof tiles; sphere debris; impact effect; numerical simulation