| Abstract:Aiming at the impact resistance of aeroengine casing with bolted flanges, the evaluation indexes applicable to casing
containment in existing studies were summarized and compared. The evaluation index of bolt energy density was proposed. The effect of the
geometric parameters of the bolt connection structure on its impact resistance was studied considering two evaluation indexes, namely the
bolt internal energy ratio and the bolt energy density. The feasibility and rationality of using bolt energy density as the evaluation index
were verified through data comparison. The results show that with the increase of the flange height, the bolt diameter, and the number of
bolts, the bolt internal energy ratio decreases gradually. With the increase of the casing thickness, the bolt internal energy ratio shows a
trend of first decreasing and then increasing, which is inconsistent with the actual situation. The flange height, the bolt diameter, the
number of bolts, and the casing thickness are negatively correlated with the bolt energy density. Taking bolt energy density as the evalua?
tion index in the numerical simulation can better reflect the impact resistance of bolted structures and have higher efficiency. |
