Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
308391 | Thin-Walled Structures | 2016 | 10 Pages |
•Shell-like stress resultant elastoplasticity and geometrically exact thin-walled beam elements are combined.•A simplified and constrained Ilyushin criterion is proposed.•The return mapping algorithm and the consistent tangent assume particularly simple forms.•Through-thickness numeric integration is avoided.•The accuracy and computational efficiency of the approach is demonstrated.
This paper demonstrates the computational advantages of combining shell-like stress resultant elastoplasticity with geometrically exact thin-walled beam finite elements. The material model employed follows the Ilyushin criterion for shell-type stress resultants, making it possible to bypass computationally expensive through-thickness numeric integration and enforce specific stress resultants to zero, leading to a particularly simple form of the return mapping algorithm and of the consistent constitutive tangent. This constitutive model is included in a geometrically exact two-node beam finite element which allows for torsion-related warping and Wagner effects. The accuracy of the proposed approach is assessed in several numerical examples.