Dynamic Tests on Metallic Impact Limiters.

摘要

Three different types of metallic impact limiters were tested;plain fins,laterally stiffened fins and tubes whose axes were aligned with the direction of impact. All specimens were made of 304stainless steel and were annealed before testing. A heavy steel drop table of variable mass and moving at about 13.4 m/s (44ft/s) was used to impact the specimens which were mounted on a stationary base. Impact velocity,drop table acceleration vs. time and force vs. time were measured on each test and were used to calculate the energy absorbed by the impact limiters. Results showed that the peak stress that a plain fin can transmit to the cask body can be several times the static yield stress of the fin. Also as buckling proceeds the load in a plain fin drops significantly and the rate at which it absorbs energy falls off dramatically,making the fin a rather inefficient energy absorber overall. The laterally stiffened fin and the cylinders did not exhibit this rapid decrease in load-carrying capacity with deformation and hence were able to absorb relatively more energy per unit volume of material. (ERA citation 03:031555)