Publication
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 (58 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.
Romain Christophe Rémy Fleury, Rayehe Karimi Mahabadi, Taha Goudarzi
Andreas Mortensen, Léa Deillon, Suzanne Godelieve Alphonsine Verheyden