Kunststoffe-international.com: Zeitschrift Kunststofftechnik / Journal of Plastics TechnologyENGgabLibrary RSS Component v1.0Wed, 8 Sep 2010 01:46:07 UTChttp://www.kunststoffe-international.com/directlink.asp?WAK100500Dipl.-Phys. Thomas Rechtenwald, Dr.-Ing. Thomas Frick, Prof. Dr.-Ing. Michael Schmidt Bayerisches Laserzentrum, Erlangen, Germany Dipl.-Ing. Florian Schüßler, Dipl.-Ing. Michael Rösch, Dipl.-Ing. Johannes Hörber, Prof. Dr.-Ing. Klaus Feldmann Institute for Manufacturing Automation and Production Systems, University of Erlangen-Nuremberg, Erlangen, Germany Additive fabrication technology is predominantly used for prototyping applications up to now. One reason why these flexible technologies are not widely used for end user products is the restricted knowledge about the durability of the manufactured parts. This work provides detailed data on the long term behaviour of mechanical properties of stereolithography specimens after accelerated aging by thermal shock cycling according to automotive standards. One stereolithography resin is found, which shows high durability under repeated extreme thermal load. Dipl.-Ing. Jan Kuppinger, Dipl.-Ing. Florian Wafzig, Prof. Dr.-Ing. Frank Henning Fraunhofer Institut für Chemische Technologie, Pfinztal Dr.-Ing. Kay Weidenmann, Dipl.-Ing. Marco Kordick, Prof.Dr.-Ing. Peter Elsner Institut für Werkstoffkunde 1, Karlsruhe Institute of Technology Glass fibre reinforced polyurethane plates automatically manufactured with the polyurethane fibre spraying process were studied with respect to the fibre length and the glass fibre mass content to determine their influence on the mechanical properties. The glass fibre mass content was varied in 5 wt. % steps from 0% to 30%. The length of the glass fibres was 6 and 12 mm. As matrix material a fast reaction polyurethane system was used. Mechanical properties were investigated by tensile tests, 3-point bending tests and Charpy impact tests. Specimens were taken in and orthogonally to the direction of the spraying head movement. Prof. Barbara O. Calcagno, Prof. Dr. Roderic Lakes, Prof. Dr. Tim Osswald, Prof. Dr. Wendy Crone University of Puerto Rico, Mayagüez, University of Wisconsin, Madison The viscoplastic behavior of high density polyethylene, polypropylene, and polycarbonate under uniaxial tensile loading at constant strain rate and large strains was studied. Standard ASTM samples of the polymers cast by injection molding were tested at room temperature and constant crosshead speed; testing was conducted in the range of 5 to 300 mm/min. A single constitutive relation which captures the plastic flow behavior of all three polymers was found as a function of strain and strain rate in the range of 0.01 to 0.1 s. The values of the model parameters for each polymer are presented. A relation for the yielding of the polymeric materials as a function of strain rate is also reported.]]>Tue, 31 Aug 2010 22:00:00 UTChttp://www.kunststoffe-international.com/directlink.asp?WAK100501Tue, 31 Aug 2010 22:00:00 UTChttp://www.kunststoffe-international.com/directlink.asp?WAK100502Tue, 31 Aug 2010 22:00:00 UTChttp://www.kunststoffe-international.com/directlink.asp?WAK100503Tue, 31 Aug 2010 22:00:00 UTC