STRUCTURAL BEHAVIOR OF DAMAGED ANISOTROPIC STIFFENED PANELS UNDER COMPRESSIVE LOADS

摘要

Stiffening concepts are frequently used to increase buckling characteristics of a thin plate. A skin delamination or a stiffener de-bonding in a stiffened panel can cause buckling prior to the designed critical condition and can cause a reduction in global strength. The presence of cyclical loading and fatigue effect can have important consequence on damage propagation and structural integrity. The static structural behavior of a damaged stiffened composite panel is presented as a preliminary activity for the introduction of the subsequent fatigue case. Uniaxial and biaxial loading condition are applied to the panel in order to point out the damage effects. Strain distribution under critical and post-critical (local-global) static test condition are reported. Very preliminary load cycling test is performed and presented .