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Modelling Large Inelastic Dilatational and Distortional Deformations in 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: USNCCM17: Book of Abstracts, USACM , 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, plastic/inelastic deformations, and all state variables are defined in the current state of the material. The deformation state of the material is represented by a unimodular tensor, characterizing elastic distortional deformation, and an elastic dilatation. The model is able to account for such essential phenomena as strain-rate dependence, work hardening, stress relaxation, volumetric inelastic deformations, and damage. Uniaxial tension tests were performed on polyoxymethylene (POM), which is a semi-crystalline polymer widely used in the industry. Three types of tests were conducted: monotonic loading tests at different strain rates, stress relaxation tests, and loading-unloading tests. These tests produced large elastic and inelastic deformations which were reproduced well by the model. The model was also implemented as a VUMAT in Abaqus, and the deformation of a 3D geometry was simulated. Specifically, a simple structure of the POM material was deformed and then unloaded. Thenresulting elastic spring-back and residual stress state was investigated. 

Place, publisher, year, edition, pages
USACM , 2023.
National Category
Mechanical Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-127835OAI: oai:DiVA.org:lnu-127835DiVA, id: diva2:1838687
Conference
17th U. S. National Congress on Computational Mechanics, Albuquerque, New Mexico, July 23-27, 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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