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Publikationstyp: Beitrag in wissenschaftlicher Zeitschrift
Art der Begutachtung: Peer review (Publikation)
Titel: Nonlinear dynamics of locally pulse loaded square Föppl–von Kármán thin plates
Autor/-in: Mehreganian, Navid
Soleiman Fallah, Arash
Louca, Luke A
et. al: No
DOI: 10.1016/j.ijmecsci.2019.105157
10.21256/zhaw-20297
Erschienen in: International Journal of Mechanical Sciences
Band(Heft): 163
Heft: 105157
Erscheinungsdatum: 11-Sep-2019
Verlag / Hrsg. Institution: Elsevier
ISSN: 0020-7403
Sprache: Englisch
Schlagwörter: Pulse loading on membrane; Foeppl-von Karman plate
Fachgebiet (DDC): 510: Mathematik
530: Physik
Zusammenfassung: Modern armour graded thin steel plates benefit from significant elastic strength with high elastic energy storage capacity, which contributes to dissipation of total impulse from extensive blast loads within the bounds of the elastic region. Higher elastic energy storage capability mitigates the probability of catastrophic damage and ensuing large deformations compared to the conventional graded metallic panels. While blast assessment of such structures is important to design and application of protective systems, limited studies are available on their response to localised blasts. The present paper aims at deducing, from the minimization of Föppl-von Kármán (FVK) energy functional, the dynamic response of localised blast loaded thin elastic square plates undergoing large deformations. The presumed blast load function is a multiplicative decomposition of a prescribed continuous piecewise smooth spatial function and an arbitrary temporal function which may assume various shapes (e.g. rectangular, linear, sinusoidal, exponential). A kinematically admissible displacement field and the associated stress tensor were considered as a truncated cosine series with multiple Degrees-of-Freedom (DoF's). From the prescribed displacement field, having simply supported boundary conditions, useful expressions for stress tensor components were delineated corresponding to a unique mode and a series of differential equations were derived. The explicit solutions were sought using the Poincaré-Lindstedt perturbation method. The closed form solutions of each mode were corroborated with the numerical FE models and showed convergence when the first few modes were considered. The influence of higher modes, however, on the peak deformation was negligible and the solution with 3 DOF's conveniently estimated the blast response to a satisfactory precision.
URI: https://digitalcollection.zhaw.ch/handle/11475/20297
Volltext Version: Akzeptierte Version
Lizenz (gemäss Verlagsvertrag): CC BY-NC-ND 4.0: Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International
Departement: School of Engineering
Organisationseinheit: Institute of Computational Physics (ICP)
Enthalten in den Sammlungen:Publikationen School of Engineering

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