On Prediction of 3d Stress State in Elastic Shell by Higher-order Shell Formulations

Brank, Boštjan (avtor), Ibrahimbegović, Adnan (avtor), Bohinc, Uroš (avtor)

In this work we study the accuracy of modem higher-order shell finite element formulations in computation of 3d stress state in elastic shells. In that sense we compare three higher-order shell models: (i) with seven dislacement-like kinematic parameters, and (ii, iii) with six displacement-like kinematic parameters plus one strain-like kinematic parameter introduced by two different versions of enhanced assumed strain (EAS) concept. The finite element approximations of all shell models are based on 4-node quadrilateral elements. Geometrically nonlinear and consistently linearized forms of considered formulations are given. Several numerical examples are presented, where computed stresses are compared with analytical solutions. It was found that through-the-thickness variation of some (non-dominant) stress tensor components, including through-the-thickness normal stress, may be computed very inaccurately. The reliable representation for those stresses can be interpreted only if the ``layer-wise'' averaging or the through-the-thickness averaging is performed.

• Jezik: Angleški jezik
• Ključne besede: higher-order shell model, 3d constitutive equations, stress computation
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo
• Založnik: Techno Press
• Leto izida: 2008
• Št. strani: Str. 85-108
• Številčenje: Letn. 33, Št. 1
• PID: 20.500.12556/RUL-32144
• UDK: 624.074.4
• ISSN pri članku: 1526-1492
• COBISS.SI-ID: 4418145
• Datum objave v RUL: 10.07.2015

Gradivo je del revije

• Naslov: Computer modeling in engineering & sciences
• Skrajšan naslov: Comput. model. eng. sci.
• Založnik: Tech Science Press
• ISSN: 1526-1492
• COBISS.SI-ID: 1931361

Sekundarni jezik

• Jezik: Angleški jezik
• Ključne besede: lupine, 3d napetosti