Publication

Structure and deformation mechanisms in UHMWPE-fibres

John Christopher Plummer
2003
Journal Articles

Abstract

Raman microscopy is applied to a gel-spun UHMWPE-fibre (Dyneema SK60) to determine the distribution of axial molecular stresses and their change with time (in creep and during stress relaxation). A more detailed method is proposed to quantify the observed characteristic changes in local stress distribution. The increase in highly overstressed bonds (5 8 GPa) is ascribed to the straining of tie-molecules during creep. Their pull-out, crystal plasticity and grain-boundary slip determine stress relaxation. A refined structural model of the UHMWPE-fibre is proposed, which is used to discuss the still existing difference between theoretical and practical strength of such fibres.

Official source

https://infoscience.epfl.ch/entities/publication/52bf4ed1-dcaa-4cff-bbae-61e7e7484b0d

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

John Christopher Plummer
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/52bf4ed1-dcaa-4cff-bbae-61e7e7484b0d

About this result

Related concepts (32)

Ultimate tensile strength

Ultimate tensile strength (also called UTS, tensile strength, TS, ultimate strength or in notation) is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials the ultimate tensile strength is close to the yield point, whereas in ductile materials the ultimate tensile strength can be higher. The ultimate tensile strength is usually found by performing a tensile test and recording the engineering stress versus strain.

Deformation (engineering)

In engineering, deformation refers to the change in size or shape of an object. Displacements are the absolute change in position of a point on the object. Deflection is the relative change in external displacements on an object. Strain is the relative internal change in shape of an infinitesimally small cube of material and can be expressed as a non-dimensional change in length or angle of distortion of the cube. Strains are related to the forces acting on the cube, which are known as stress, by a stress-strain curve.

Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load.

Related publications (26)

Structure and deformation mechanisms in UHMWPE-fibres

Chat with Graph Search

Design for additive manufacturing of cryogenic flexible pivot enabling on-demand customization, and reducing failure risks

Impact of AlN buffer thickness on electrical and thermal characteristics of AlGaN/GaN/AlN HEMTs

Understanding the Late Age Strength of Low CO2 Binders Incorporating Calcium Aluminates-Based Accelerators