Papers by Author: Alois K. Schlarb

Abstract: To study the electrical behavior of nanoscale carbon fibers (NCF)/epoxy nanocomposites under mechanical load, NCF/epoxy materials were produced using different mechanical dispersion methods like pearl mill and three roll mill. Various preliminary mechanical tests with simultaneous resistance measurements have been conducted. The influence of the filler content, the dispersion quality and the filler geometry on the electrical properties of NCF/epoxy composites was investigated as a function of the mechanical loading. The strain sensitivity strongly depended on the filler content and the filler geometry. In cyclic loading tests at low strains the resistance showed a reversible and linear behaviour. At higher strains irreversible resistance changes were observed. In addition, the specific surface resistance corresponded even during unloading with the highest strain level applied so far. This indicates the potential of NCFs/epoxy nanocomposites to monitor the loading history of a sample.

Abstract: Relatively poor creep resistance is considered as a deficiency of thermoplastic materials in general. In order to comprehensively and deeply study the effect of nanoparticles incorporated into a polyamide matrix a systematic investigation on various kinds of nanofillers under differed temperatures and stress levels have been performed. It was found that the creep resistance of polyamide 66 can be significantly enhanced due to the incorporation of nanofillers and the behavior of the composites can be easily described by the model of Findley.