Impact damage tolerance analysis of stiffened composite panels

摘要

An approach based on a displacement compatibility model is presented for both riveted and bonded stiffened composite panels containing impact damage. This represents the first application of the displacement compability model to the failure analysis of impacted stiffened composite panels, and some new results are obtained for the impact damage tolerace properties of stiffened composite panels. In the present analysis, the previous displacement, compatibility model for a stringer/orthotropic skic panel is improved for a stringer/unbalanced skin panel. The impact damage is simplified as a elliptic hole based on the compressive failure mechanisms of impacted composites and stiffened panels. Predictions for failure loads and damage arrest capability agree well with experiemntal results for several composite panel configurations.The important results obtained inthis study are : (1) damage arrest capability is dominated by the strength of the skin/stringer attacment; (2) distinct two-staga failure shows that the riveted panels have significant damage arrest capability due to the high shear strength of the rivets; and (3) since the very low shear strength of the skin/stringer attachment, the co-cured panels have no damage arrest capability.