TY  - JOUR
A1  - Ibanez, Stalin
A1  - Kraus, Matthias
T1  - A Numerical Approach for Plastic Cross Cross-Sectional Analyses of Steel Members
JF  - ce/papers
N2  - Global structural analyses in civil engineering are usually performed considering linear-elastic material behavior. However, for steel structures, a certain degree of plasticization depending on the member classification may be considered. Corresponding plastic analyses taking material nonlinearities into account are effectively realized using numerical methods. Frequently applied finite elements of two and three-dimensional models evaluate the plasticity at defined nodes using a yield surface, i.e. by a yield condition, hardening rule, and flow rule. Corresponding calculations are connected to a large numerical as well as time-consuming effort and they do not rely on the theoretical background of beam theory, to which the regulations of standards mainly correspond. For that reason, methods using beam elements (one-dimensional) combined with cross-sectional analyses are commonly applied for steel members in terms of plastic zones theories. In these approaches, plasticization is in general assessed by means of axial stress only. In this paper, more precise numerical representation of the combined stress states, i.e. axial and shear stresses, is presented and results of the proposed approach are validated and discussed.
KW  - Stahlkonstruktion
KW  - Plastizität
KW  - Strukturanalyse
KW  - Stahlbauteil
KW  - Axialspannung
KW  - Finite-Elemente-Methode
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20220112-45622
UR  - https://onlinelibrary.wiley.com/doi/full/10.1002/cepa.1527
VL  - 2021
IS  - Volume 4, issue 2-4
SP  - 2098
EP  - 2106
PB  - Ernst & Sohn, a Wiley brand
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Melnikov, B. E.
A1  - Kadashevich, I. Y.
A1  - Semenov, Artem
T1  - Damage of Metalworkses under the Complex Varying Loading
N2  - The phenomenological and computational aspects of the various damage models applications for the low and multi cyclic fatigue processes are investigated. Damage is considered as internal state variable, describing macroscopic effects of the progressive material degradation, within the framework of continuum damage mechanics. Present analysis is restricted to the case of isotropic damage, which can be modeled by a scalar variable. The strain, force and power types of kinetic equations for the damage evolution description are considered. The original mixed strain-power type damage model is developed for taking into account the different physical fracture mechanism in monotone and cyclic loading. The constitutive equations of plastic flow theory coupled and uncoupled to damage has been considered. The rational algorithm of implementation into finite element code is considered for developed damage models. Set of the computational experiments has been carried out for the various structures (huge aerials, pipelines, fastening units, vessel of nuclear reactor) and cases of loading. The comparison of the predictions of the developed model with experimental data is performed for 1X18H10T steel tubular specimens for complex paths of loading and for complex profiles beams under cyclic loading. Damage field distribution is the basic information for the prediction of crack initiation in structures. The developed method of structural parameter for stress concentration zones is discussed for correcting of crack location. It allows to describe the crack initiation near surface domain as observe in numerous experiments.
KW  - Stahlkonstruktion
KW  - Bruchmechanik
KW  - Dynamische Belastung
Y1  - 1997
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-5409
ER  -