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2018
Conference Paper
Titel
Short fibre reinforced thermoplastics - A novel standard to determine material parameters under tension, pressure, shear and mixed loadings
Abstract
Short fibre reinforced plastics (SFRP) show anisotropic material behavior depending on the manufacturing process. Test specimens which make a combination of tensile, compressive and shear loads feasible can provide a big improvement in determining the elasticities, strengths and fatigue stiffness needed for material models. Tubular specimens have the advantage of high geometric stability under compression and torsional load, so that characteristic values can also be determined without buckling supports. With these test specimens a shear load is realized with a torsional deformation. In addition, these test specimens are well-suited for measuring the fatigue strength under uniaxial as well as combined bi-axial stress for all technically relevant load conditions. However, up until now there is no comprehensive standard for tubular test specimens, their form, and the tests to be performed with them with respect to material parameters. The new DIN SPEC 16457 "Short fiber reinforced thermoplastics - tensile-compression shear testing on tubular test specimens with alternating load", which is to be released in 2018, builds on the results of different prior research projects. This paper discusses the features and stress results of the test specimens described in the DIN SPEC 16457.