The paper presents a combined experimental and computational study of the residual strength of a butt-joint panel with multiple site damage (MSD). The computational model uses a special strip-yield model adapted to MSD, which is implemented into a geometrically non-linear finite element model. Crack initiation is modelled by a critical crack opening displacement and tearing by a constant crack opening angle (CTOA) criterion. Centre cracked tension tests were first performed to determine the basic fracture parameters. These fracture parameters were then used in the analysis of butt-joint panels with a large lead crack and smaller MSD cracks inserted along the upper row. The simultaneous propagation of multiple cracks in the tests was monitored continuously by aid of a specially developed image analysis technique. Loads for crack initiation, propagation and subsequent crack link-up and panel failure were computed and compared with test results. The geometrical non-linear effects and the sensitivity to variations in fracture parameters were quantified. An excellent overall agreement was found for the most refined models.
|Autori:||GALATOLO R; K.F. NILSSON|
|Titolo:||An experimental and numerical analysis of residual strength of butt-joint panels with multiple site damage|
|Anno del prodotto:||2001|
|Appare nelle tipologie:||1.1 Articolo in rivista|