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Characterization of the Mechanical Properties of Technical Fibers at Extreme Strain Rates
Author(s) -
Bahners Thomas,
Schloßer Uwe,
Gutmann Jochen
Publication year - 2012
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201100312
Subject(s) - materials science , composite material , strain rate , strain (injury) , scanning electron microscope , saturation (graph theory) , characterization (materials science) , stress–strain curve , strain energy , stress (linguistics) , deformation (meteorology) , structural engineering , finite element method , nanotechnology , medicine , linguistics , philosophy , mathematics , combinatorics , engineering
Technical textiles can be subject to mechanical stress with strain rates far from the quasi‐static conditions of common standardized tests. The objective of the presented work was therefore to study the mechanical properties of technical yarns made of PA 6.6, PA 4.6, and PET under strain rates up to 200 s −1 , making use of a “falling weight” apparatus. It can be summarized that the moduli at specific points of the stress–strain‐curve increase with the strain rate to values up to 50% higher than the data determined under quasi‐static strain. Saturation is observed for strain rates larger than 50 s −1 . The analysis of failure morphology by scanning electron microscopy revealed molten material at the ends of broken fibers. This indicates thermal failure of the fibers due to local concentration of energy loading.