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Study of Two-dimensional Kirigami in Different Materials
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Studie av tvådimensionell Kirigami i olika material (Swedish)
Abstract [sv]

De mekaniska egenskaperna hos ett tvådimensionellt material kan ändras med hjälp av Kirigami, som är en japansk klippkonst i papper. Material där man med geometriförändringar ändrar materialegenskaperna kallas metamaterial.

I det här examensarbetet dokumenteras inverkan av ett Kirigami-mönster i olika material, bland annat plast och papper. Resultaten kommer att användas för att utvärdera om något passar att användas till ett stasband framtaget av Ortrud Medical AB.

Remsan har en mönstrad ”fjäderyta”, som påverkar styvheten, och en kraftzoon. I det här arbetet studeras enbart det mönstrade området. För att utvärdera materialen och välja det mest lämpade, användes Pughs utvärderingsmatris. Materialen utvärderas bland annat med avseende på robusthet, dragmotstånd och patientkomfort. Ett av materialen valdes ut för ytterligare provning på grund av dess intressanta deformationsbeteende.

I det här arbetet tillämpas både experimentella och analytiska metoder. Resultaten användes sedan för att verifiera en FE-modell av systemet. Modellen och experimenten gav liknade resultat vid små deformationer, dock begränsades verifieringen av materialdatabasen.

En delstudie visade att det är möjlighet att ställa in mönsterdimensionerna, så att töjningsegenskaperna hos metamaterialet kan justeras.

Abstract [en]

The mechanical properties of a 2D material can be altered with Kirigami, a Japanese paper cutting art. Such altered materials are called metamaterials – where a certain geometry is imposed on a material to change its material properties. 

This thesis documents the effects of a specific Kirigami pattern cut into a range of different 2D materials, such as plastic films or paper – the results of which will be used to evaluate the suitability of each material candidate to a product, the ‘IV strip’, designed and produced by Ortrud Medical AB. 

The strip contains a patterned ‘spring’ area, which has reduced stiffness due to the patterned defects imposed on it, and a force indication zone. The force indication zone will not be considered.

The material selection study used a Pugh’s Evaluation matrix method to choose the best candidate. A few materials were chosen due their suitability in criteria such as robustness of results, tearing force and patient comfort. One material was selected for further experimentation due to its interesting stress/strain characteristics.

A further study was then carried out to assess the possibility of tuning the pattern dimensions to alter the tensile properties of the metamaterial. This study includes both computational and experimental methods to verify the feasibility of a simulation model. The study found that it is possible to draw relationships between cut length and stiffness of the pattern. Whilst the computational and experimental results were similar for very small deformations, the FEM simulation struggles at higher deformations because of the lack of available material properties for the program input.

Place, publisher, year, edition, pages
2018. , p. 41
Series
TRITA-ITM-EX 2018 ; 696
Keywords [en]
FEM, Material Selection, Metamaterial, Stiffness Tuning, Venepuncture
Keywords [sv]
FEM, materialval, metamaterial, styvhetsanpassning, venpunktion
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-245076OAI: oai:DiVA.org:kth-245076DiVA, id: diva2:1293962
Supervisors
Examiners
Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-03-06Bibliographically approved

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