The Effects of Shell Joins and Bonding on the Stability of Acrylic Resin Cellular Shells

摘要

Six ACRYLIC resin cellular shells were tested under external hydrostatic pressure to determine the effects of joints between individual shell structure components and the effects of bonding on cellular shell stability. When the shell stiffeners were restrained from moving laterally, the location of joints and the degree of bonding did not affect the general elastic stability enough to cause failure by elastic buckling. All shells failed by material yielding except the one in which the stiffeners were not restrained from moving laterally. However, the distribution of stresses and strains on the other shell surfaces was considerably influenced by the location of joints and the degree of bonding. The shell stresses were calculated by Pulos and Mehta's formulas and compared with the experimentally determined stresses. The calculated and experimental values agreed within ±15 per cent except for the principal axial stresses on the shell facings at the stiffeners. Four epoxy resin models of the cellular shells were pressure-tested and ana-lyzed photo elastically to determine the effects of stress concentrations at the junctures of the stiffeners and the inner and outer shell facings.