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Modelling of rate-dependent and volumetric inelasticity of semi-crystalline polymers using an Eulerian framework
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
Technion Israel Institute of Technology, Israel.
2023 (English)In: 17th International Conference on Computational Plasticity (COMPLAS 2023), Barcelona, Spain, September 2023, International Center for Numerical Methods in Engineering (CIMNE), 2023Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

A constitutive model for isotropic, semi-crystalline polymers is proposed. The model is Eulerian in the sense that it is independent of measures of total deformation and plastic/inelastic deformations. Hence, all state variables are defined in the current state of the material. It is able to account for such essential phenomena as strain-rate dependence, work hardening, stress relaxation, volumetric inelastic deformations, and damage. The model includes 15 model parameters and was applied to uniaxial tension tests performed on polyoxymethylene (POM), which is a semi-crystalline polymer widely used in the industry. Three types of tests were conducted: monotonic tests at different strain rates, stress relaxation tests, and loading-unloading tests. The model was able to reproduce the experimental results well. The proposed model was also implemented as a VUMAT in Abaqus. The deformation of a 3D geometry was simulated. The 3D geometry consisted of a “tooth” that was deformed by a rigid block, causing permanent deformation and spring-back of the tooth. The elastic spring-back and relaxation of the tooth is demonstrated and also the residual state in the tooth after the inelastic deformation.

Place, publisher, year, edition, pages
International Center for Numerical Methods in Engineering (CIMNE), 2023.
National Category
Mechanical Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-127837OAI: oai:DiVA.org:lnu-127837DiVA, id: diva2:1838689
Conference
17th International Conference on Computational Plasticity (COMPLAS 2023), Barcelona, Spain, September 2023
Available from: 2024-02-18 Created: 2024-02-18 Last updated: 2024-02-20Bibliographically approved

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Kroon, Martin

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