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Practical approach to plastic collapse of conical shells under axial compression
https://orcid.org/0000-0001-7141-9368
https://orcid.org/0000-0002-4051-567X
Abstract Steel cylindrical shell structures such as silos and tanks are very sensitive to geometric imperfections and prone to a plastic instability failure known as elephant's foot (EF) buckling. This type of buckling arises under axial compression. The aim of this paper is to explore the plastic collapse response in conical shells with low semi-vertex angle values under compression. In a first step, the initial geometric imperfection shapes that dictate which plastic mechanisms arise were identified using finite element (FE) models. In a second step, a parametric study reported two plastic collapse mechanisms and showed that the elephant's foot plastic collapse mechanism is the most likely to appear in compressed conical shells with low values, followed by the Yoshimura collapse mechanism, more common with larger values. Finally, a practical model in which the parameters have been adjusted from numerical models has been derived for the elephant's foot plastic mechanism. This model provides the load-deformation behaviour of compressed conical shells at the post-collapse region. The load vs. end-shortening curves provided by the model have been validated through comparison with curves given by the FE models. The good agreement between the results proves the efficiency of the practical model to predict the collapse response of conical shells.
Highlights Different buckling categories have been obtained for two different thicknesses. Sensitivity to imperfections has been analysed and different imperfection amplitudes have been considered. Elephant foot mechanism is the most common failure that arises with small imperfections. The Yoshimura mechanism mainly appears with large initial imperfections. A model to define the compressive load vs. end-shortening displacement response for conical shells has been developed.
Practical approach to plastic collapse of conical shells under axial compression
https://orcid.org/0000-0001-7141-9368
https://orcid.org/0000-0002-4051-567X
Abstract Steel cylindrical shell structures such as silos and tanks are very sensitive to geometric imperfections and prone to a plastic instability failure known as elephant's foot (EF) buckling. This type of buckling arises under axial compression. The aim of this paper is to explore the plastic collapse response in conical shells with low semi-vertex angle values under compression. In a first step, the initial geometric imperfection shapes that dictate which plastic mechanisms arise were identified using finite element (FE) models. In a second step, a parametric study reported two plastic collapse mechanisms and showed that the elephant's foot plastic collapse mechanism is the most likely to appear in compressed conical shells with low values, followed by the Yoshimura collapse mechanism, more common with larger values. Finally, a practical model in which the parameters have been adjusted from numerical models has been derived for the elephant's foot plastic mechanism. This model provides the load-deformation behaviour of compressed conical shells at the post-collapse region. The load vs. end-shortening curves provided by the model have been validated through comparison with curves given by the FE models. The good agreement between the results proves the efficiency of the practical model to predict the collapse response of conical shells.
Highlights Different buckling categories have been obtained for two different thicknesses. Sensitivity to imperfections has been analysed and different imperfection amplitudes have been considered. Elephant foot mechanism is the most common failure that arises with small imperfections. The Yoshimura mechanism mainly appears with large initial imperfections. A model to define the compressive load vs. end-shortening displacement response for conical shells has been developed.
Practical approach to plastic collapse of conical shells under axial compression
https://orcid.org/0000-0001-7141-9368
https://orcid.org/0000-0002-4051-567X
Abstract Steel cylindrical shell structures such as silos and tanks are very sensitive to geometric imperfections and prone to a plastic instability failure known as elephant's foot (EF) buckling. This type of buckling arises under axial compression. The aim of this paper is to explore the plastic collapse response in conical shells with low semi-vertex angle values under compression. In a first step, the initial geometric imperfection shapes that dictate which plastic mechanisms arise were identified using finite element (FE) models. In a second step, a parametric study reported two plastic collapse mechanisms and showed that the elephant's foot plastic collapse mechanism is the most likely to appear in compressed conical shells with low values, followed by the Yoshimura collapse mechanism, more common with larger values. Finally, a practical model in which the parameters have been adjusted from numerical models has been derived for the elephant's foot plastic mechanism. This model provides the load-deformation behaviour of compressed conical shells at the post-collapse region. The load vs. end-shortening curves provided by the model have been validated through comparison with curves given by the FE models. The good agreement between the results proves the efficiency of the practical model to predict the collapse response of conical shells.
Highlights Different buckling categories have been obtained for two different thicknesses. Sensitivity to imperfections has been analysed and different imperfection amplitudes have been considered. Elephant foot mechanism is the most common failure that arises with small imperfections. The Yoshimura mechanism mainly appears with large initial imperfections. A model to define the compressive load vs. end-shortening displacement response for conical shells has been developed.
Practical approach to plastic collapse of conical shells under axial compression
Pradera-Mallabiabarrena, Ainara (author) / Lopez-Arancibia, Aitziber (author) / Ruiz de Galarreta, Sergio (author) / Insausti, Aimar (author)
Thin-Walled Structures ; 159
2020-11-16
Article (Journal)
Electronic Resource
English
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