き裂損傷を有する防撓パネル構造の圧縮残存強度評価に関する研究

抄録

Residual ultimate strength of stiffened panel including crack-like defects under longitudinal uni-axial thrust is investigated. A single transverse/longitudinal crack with different length and location is considered and is introduced into the continuous stiffened panel model. A shell finite element (FE) modeling is adopted and the crack is modeled as a displacement discontinuity in the FE model by introducing double nodes along the segment. A series computation of nonlinear FE analysis has been carried out employing LS-DYNA to examine the ultimate strength and influence of the cracks to the collapse behaviors. Three types of panel thickness and four sizes of longitudinal T-shaped stiffeners are assumed. The reduction characteristics of the ultimate strength and change of collapse behaviors are discussed through the nonlinear FE computations.