Simulation of Structures Exhibiting Instability Under Thermal-Mechanical Transient Loading
Technical Report,01 Sep 2014,31 Aug 2015
High Performance Technologies Innovations LLC Chantilly United States
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This document is the Final Technical Report for the PETTT Special Project, BY14-020SP, Simulation of Structures Exhibiting Instability Under Thermal-Mechanical Transient Loading. Slender curved structures such as shallow arches and cylindrical panels are commonly used structural components in aerospace engineering. When these curved structures are subjected to transverse loads, they can be susceptible to snap-through buckling where a structure suddenly jumps from its initial configuration to a remote coexisting equilibrium configuration. Such processes lead to large and frequent stress reversals that can significantly exacerbate the fatigue failure.This report focuses on investigating the static and dynamic snap-through of slender curved structures. The report first presents an analytical method to study the nonlinear static buckling and post-buckling of shallow arches with geometric imperfections. Then an efficient alternative is proposed to quickly determine the dynamic snap-through boundaries of shallow arches and cylindrical panels.