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Temperature and plastic strain dependent Chaboche model for 316L used in simulation of Cold Pilgering
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Hållfasthetslära.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Hållfasthetslära.
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Hållfasthetslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-96307OAI: oai:DiVA.org:ltu-96307DiVA, id: diva2:1748845
Tillgänglig från: 2023-04-04 Skapad: 2023-04-04 Senast uppdaterad: 2023-04-04
Ingår i avhandling
1. Modeling of Cold Pilgering of Stainless Steel Tubes
Öppna denna publikation i ny flik eller fönster >>Modeling of Cold Pilgering of Stainless Steel Tubes
2023 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Cold pilgering is a complex forming process used to produce seamless tubes in terms of modeling due to the complexity in kinematic of tools, friction condition and material behavior. The process development has mostly been based on simple formulas and costly full-scale tryouts. The aim in this study is to develop validated Finite element models of cold pilgering to support design of a robust process.

A three-dimensional thermo-mechanical Finite element models of cold pilgering has been developed in the course of the work leading to this thesis. The commercial code MSC. Marcwas used in the simulations. General 3D models are needed to be able to capture asymmetric deformation in cold pilgering. Elastic deflections of tools and roll stand were included in the model via linear and nonlinear springs that were calibrated versus experiments. A temperature dependent Chaboche type plasticity model was employed in this simulation to mimic strain hardening and softening behavior under multidirectional loading. The model parameters were optimized using multi-directional compression and uni-directional tensile tests. Heat exchange between tools and lubricant was included in the simulation via heat convection films on the surfaces. The film parameters were calibrated using experimental data. Simulation predictions for hardening, rolling force, process temperature and geometry were compared with experiments for validation purposes. The predictions showed overall good agreement with validation experiments enabling the use of this model for understanding and improving the process.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2023
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nyckelord
Cold pilgering, finite element method
Nationell ämneskategori
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Forskningsämne
Hållfasthetslära
Identifikatorer
urn:nbn:se:ltu:diva-96309 (URN)978-91-8048-293-6 (ISBN)978-91-8048-294-3 (ISBN)
Disputation
2023-06-14, E231, Luleå tekniska universitet, Luleå, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2023-04-04 Skapad: 2023-04-04 Senast uppdaterad: 2023-05-24Bibliografiskt granskad

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