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Testing and modelling of UHMWPE.
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2014 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The mechanical behavior of unidirectional Dyneema fiber composite is an interesting topic. It is an unusual material composed by basically fiber and glue. The material has a simple makeup but complex behavior. This needs to be studied in order to understand and calculate the mechanical properties. It is also important how the composite behaves in different settings, since the material is used in different kinds of environments.

Throughout the project material behavior has been investigated with tensile and shear testing. High speed cameras were used in order to capture the deformation during the tests. The deformations were calculated with Speckle technique.

The tensile tests showed that the material has a linear elastic response. There is a clear breaking point and no plasticity. It was noted that the Poisson’s ratio in one direction is negative. The shear tests on the other hand showed a non-linear response, with hardening.

The Dyneema composite is difficult to test and needs further investigation. Still the results in this thesis could be considered useful.

Abstract [sv]

Det mekaniska beteendet hos Dyneema fiberkomposit är ett intressant ämne. Det är ett ovanligt material som består av i stort sett fiber och lim. Materialet har en enkel uppbyggnad men komplext beteende. Detta måste studeras i syfte att förstå och att kunna beräkna de mekaniska egenskaperna. Det är också viktigt att förstå hur kompositen beter sig i olika tillstånd, eftersom materialet används i olika miljöer.

I detta projektet har materialbeteendet studerats med drag-och skjuvprov. Höghastighetskameror användes för att filma deformationen under proven. Deformationerna beräknades med Speckleteknik.

Dragtesterna visade att materialet har en linjärelastisk respons. Det finns en tydlig brottpunkt och ingen plasticitet. Det noterades att Poissons tal i en riktning är negativt. Skjuvtesterna å andra sidan visade en icke-linjär respons, med hårdnande.

Dyneema komposit är svårt att prova och behöver ytterligare utredas. Resultaten i detta examensarbete kan dock fortfarande anses användbara.

Place, publisher, year, edition, pages
2014. , 29+bilagor p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-176393OAI: oai:DiVA.org:kth-176393DiVA: diva2:866655
Subject / course
Solid Mechanics
Examiners
Available from: 2015-11-04 Created: 2015-11-03 Last updated: 2015-11-04Bibliographically approved

Open Access in DiVA

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