A comparison of computational models for wrinkling of pressurized shell-core systems

Brank, Boštjan (author), Veldin, Tomo (author), Lavrenčič, Marko (author), Brojan, Miha (author)

Four nonlinear computational models for the surface wrinkling of curved shell-core systems under external pressure are presented. Three of the considered finite element models neglect the displacements tangential to the shell surface. Two of the models are static formulations and the other two are derived in the dynamic framework. For the latter, the energy-decaying time-stepping algorithm is applied, which is suitable for numerically stiff problems, such as shell-core systems, characterized by stiff membrane and soft wrinkling deformation modes. In all cases the core is modeled by elastic springs. As a comparative problem we choose the surface wrinkling of pressurized shell-core spheres. In particular, five systems with different material and geometric properties are computed, which have different wrinkle patterns. A good agreement is found between the results of the models as well as with the relevant references, which provide numerical and experimental results. However, it has been observed that our reduced-order models are blind to the prediction of the secondary transformation % from the dimple-like pattern to the labyrinthine pattern. Another conclusion is that a non-tailored (i.e. standard) shell finite element on an elastic foundation combined with the energy-decaying scheme, provides excellent predictions of the surface wrinkle patterns.

• Language: English
• Keywords: civil engineering, structures, modeling, surface wrinkling, finite element models, core-shell spheres, energy-decaying
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Year: 2020
• Number of pages: Str. 1-24
• Numbering: Letn. , št.
• PID: 20.500.12556/RUL-121012
• UDC: 624.07:004
• ISSN on article: 0020-7462
• DOI: 10.1016/j.ijnonlinmec.2020.103611
• COBISS.SI-ID: 29398019
• Publication date in RUL: 28.09.2020

Record is a part of a journal

• Title: International journal of non-linear mechanics
• Shortened title: Int. j. non-linear mech.
• Publisher: Pergamon
• ISSN: 0020-7462
• COBISS.SI-ID: 25650432

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 28.09.2020

Secondary language

• Language: Slovenian
• Keywords: gradbeništvo, konstrukcije, modeliranje, gubanje površine, numerični modeli, sfere z jedrom in trdim ovojem, disipacija energije

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-1722
• Name: Numerično modeliranje širjenja razpok v krhkih in duktilnih konstrukcijah