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https://open.uns.ac.rs/handle/123456789/55
Title: | Convergence improvement in computation of strain-softening solids by the arc-length method | Authors: | Žarković, Drago Jovanović, Đorđe Vukobratović, Vladimir Brujić, Zoran |
Issue Date: | 15-Oct-2019 | Journal: | Finite Elements in Analysis and Design | Abstract: | © 2019 Elsevier B.V. This paper deals with problems emerging in a non-linear analysis of systems modelled by the strain softening material. Apart from sharp turns on the load-displacement diagram that characterize such numerical models, snap-back, artificial unloading and possibility of bifurcation occurrence are often encountered. These aspects challenge a non-linear system solver, in a sense of finding the appropriate equilibrium path. In this paper the CDPM2 concrete material model based on damage-plasticity is employed on notched geometry models in order to analyse convergence. A number of techniques for the solution of non-linear systems are tested and special emphasis is given to the snap-back occurrence and its influence on the convergence of the solution. A relatively simple new technique is developed for achieving better convergence throughout iterations to serve as an aid to conventional methods such as arc-length and line search. | URI: | https://open.uns.ac.rs/handle/123456789/55 | ISSN: | 0168874X | DOI: | 10.1016/j.finel.2019.06.005 |
Appears in Collections: | FTN Publikacije/Publications |
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