Validacija konstitutivnog modela 3D ispisanog materijala

undergraduate thesis

• Title (english): Validation of the constitutive model of 3D printed material
• Author: Viktorija Lukaček
• Mentor: Lana Virag (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Tema ovog završnog rada je odabir i validacija konstitutivnog modela 3D ispisanog biokompatibilnog polimera. Odabrani polimer potencijalno se može koristiti za izradu stentova pri liječenju kardiovaskularnih bolesti. Dizajnirane su pločice za validaciju modela s oblikom ćelija po uzoru na izgled pčelinjih saća te je proveden inicijalni proračun u programskom paketu Abaqus kako bi se odabrala konačna geometrija. Procesom stereolitografije ispisani su ispitni uzorci i pločice za provedbu jednoosnog ispitivanja te je pri provedbi ispitivanja na pločicama mjeren pomak deset točaka. Metodom najmanjih kvadrata određeni su materijalni parametri za formuliranje konstitutivne jednadžbe te je ponašanje odabranog polimera idealizirano modelom linearno elastično– idealno plastičnog materijala. Proveden je numerički proračun u Abaqusu za odabrani model pločice i odabrani materijalni model te su praćeni pomaci deset točaka. Na kraju je dana usporedba rezultata pomaka točaka iz jednoosnog ispitivanja i numeričkog proračuna te je dan kritički osvrt na dobivene rezultate. Rezultati su pokazali za odabrani materijalni model nije dobar za opis ponašanja odabranog polimera jer nije pokazano nikakvo poklapanje rezultata. Preporučuje se da se u budućem istraživanju ispita utjecaj smjera ispisa, tlačnih svojstva polimera kao i sposobnost polimera da upije tekućinu na svojstva materijala.

Abstract (english)

This bachelor’s thesis aims to select and validate a constitutive model of a 3D-printed biocompatible polymer. The chosen polymer could be used as a material for stents, common treatment for cardiovascular conditions. The plates with a honeycomb-inspired structure were designed for the validation of the constitutive model, and preliminary numerical calculation was conducted in Abaqus to validate the design choice. Plates and test samples for the uniaxial test were printed using stereolithography. During the uniaxial testing of plates, displacements of ten points were measured. The least-square method was used to determine the material parameters for the formulation of the constitutive equation of a material model. The elastic–perfectly plastic material model was chosen. The model was implemented in Abaqus, and during the simulation, the displacement at ten nodes was measured. Finally, a comparison of the numerical results and uniaxial test results was provided, followed by a critical review of the results. The results showed that the selected material model is not suitable for describing the behaviour of the material. Further research is recommended on the effects of printing direction, the compressive properties of the polymer, and its ability to absorb fluids, as these factors may influence the material properties.

• Keywords: stereolitografija; jednoosno ispitivanje; biokomplatibilni polimer; linearno elastičan– idealno plastičan materijalni model; Abaqus; numerička analiza
• Keywords (english): stereolitography; uniaxial test; biocompatibile polymer; linear elastic–perfectly plastic material model; Abaqus; numerical analysis
• Language: croatian
• URN:NBN: urn:nbn:hr:235:012425
• Project: Number: IP-2022-10-1497; Title: Numerička procjena učinkovitosti 4D ispisanih karotidnih stentova; Title: Numerical evaluation of medical performance of 4D printed carotid stents; Acronym: FORECAST; Leader: Igor Karšaj; Jurisdiction: Croatia; Funder: Hrvatska zaklada za znanost; Funding stream: Research Projects
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-21 19:22:36