Dynamic material behavior determination using single fiber impact
conference paper
Mechanical properties of fiber materials are used as input data for amongst others impact simulations on fiber based structures to predict their behavior. Accurate predictions for such materials are still not possible, because the mechanical properties are usually determined (quasi-)statically or inaccurately. Because fibers are in general made of viscoelastic materials, properties like the tensile modulus and maximum stress and strain depend on the experimental time scale. In this case, dynamic determination of the material properties is necessary. In this research, the dynamic tensile modulus as a function of impact velocities is determined using the single fiber impact experiment. The projectile that is used in this experiment is tailor made and minimizes geometric effects of the projectile on the material behavior. The single fiber impact experiments are performed for two different types of fibers, namely aramid fibers and UHMW-PE (Ultra High Molecular Weight Polyethylene) fibers. The projectile velocities are varied between 100 m/s and 500 m/s. The dynamic tensile modulus is determined by applying wave mechanics on the images that are obtained using high speed imaging techniques. It turns out that the tensile moduli of both fibers in this velocity range are independent of the impact velocity. The results that are obtained using this impact experiment turn out to be reproducible. The failure stress and failure strain however show a strong dependency on the impact velocity. This effect is more pronounced for the aramid fiber than for the UHMW-PE fiber.
TNO Identifier
460805
ISSN
2191-5644
ISBN
9781604237597
Source title
25th Conference and Exposition on Structural Dynamics 2007, IMAC-XXV, Orlando, Florida, USA, 19-22 February 2007
Pages
7 p.