A Study on Thermal Buckling and Mode Jumping of Metallic and Composite Plates

Aerospace

Chiara Bisagni¹  Javier Gutiérrez Álvarez¹ 

[1] Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, The Netherlands;

关键词: post-buckling;    thermal testing;    Instability;    experimental buckling;    shape change;    aeronautical morphing application;   

DOI  :  10.3390/aerospace8020056

来源: DOAJ

【 摘 要 】

Composite plates in post-buckling regime can experience mode jumping in their buckling shape, suddenly increasing the number of half-waves. This phenomenon can be advantageous, because the shape change could be used for local morphing or structural adaptability in future aerospace structures. A study of this phenomenon under heating is here presented, combining numerical and experimental techniques. At first, a set of parametric analysis was conducted to identify composite panels that present a mode jump when heated. Three plates were selected, one in aluminum alloy 2024T3, and two in AS4/8552 composite material, with layup [30/−30/5/−5]_s and [35/−35/10/−10]_s. The plates were tested in a new test setup for thermal buckling based on low thermal expansion fixtures. The mode jumping was successfully obtained experimentally for both composite plates. Numerical simulations predicted the general trends for all plates, and the mode jumps for the composite plates.

【 授权许可】

Unknown