@article{HoltmannspoetterCzarneckiFeuchtetal., author = {Holtmannsp{\"o}tter, Jens and Czarnecki, J{\"u}rgen von and Feucht, Florian and Wetzel, Michael and Gudladt, Hans Joachim and Hofmann, Timo and Meyer, J. C. and Niedernhuber, Michal}, title = {On the Fabrication and Automation of Reliable Bonded Composite Repairs}, series = {Journal of adhesion}, volume = {91}, journal = {Journal of adhesion}, number = {1-2}, publisher = {Taylor\&Francis}, doi = {10.1080/00218464.2014.896211}, pages = {39 -- 70}, abstract = {For structures made of carbon fiber-reinforced plastics (CFRP), fast, robust, and reliable repair technologies are mandatory for economical usage. In this paper, the authors explain their strategy and experiences. An automated process is proposed to achieve the challenging goals. A general overview on the origin, effects, and analysis of contaminants in CFRP structures and the relationship to the achievable strength of adhesive bonds are given. For the repair of composite structures using adhesive bonding, surface pretreatment is a key factor in terms of reliability and strength. Different surface treatment processes such as grinding, grit blasting, plasma and pulsed lasers treatments are discussed. Furthermore, the possibilities and technical implementation of an automated milling process for the repair of composite structures are presented. This change from manual production to automation tremendously improved the quality and duration of the repair and allows the creation of a uniform surface for adhesive bonding. Further integration of novel technologies is discussed and will further support and enhance the repair in the near future.}, language = {en} } @article{LovšinBrandlGlavanetal., author = {Lovšin, Matija and Brandl, Dominik and Glavan, Gašper and Belyaeva, Inna A. and Cmok, Luka and Coga, Lucija and Kalin, Mitjan and Shamonin (Chamonine), Mikhail and Drevenšek-Olenik, Irena}, title = {Reconfigurable Surface Micropatterns Based on the Magnetic Field-Induced Shape Memory Effect in Magnetoactive Elastomers}, series = {Polymers}, volume = {13}, journal = {Polymers}, number = {24}, publisher = {MDPI}, doi = {10.3390/polym13244422}, abstract = {A surface relief grating with a period of 30 mu m is embossed onto the surface of magnetoactive elastomer (MAE) samples in the presence of a moderate magnetic field of about 180 mT. The grating, which is represented as a set of parallel stripes with two different amplitude reflectivity coefficients, is detected via diffraction of a laser beam in the reflection configuration. Due to the magnetic-field-induced plasticity effect, the grating persists on the MAE surface for at least 90 h if the magnetic field remains present. When the magnetic field is removed, the diffraction efficiency vanishes in a few minutes. The described effect is much more pronounced in MAE samples with larger content of iron filler (80 wt\%) than in the samples with lower content of iron filler (70 wt\%). A simple theoretical model is proposed to describe the observed dependence of the diffraction efficiency on the applied magnetic field. Possible applications of MAEs as magnetically reconfigurable diffractive optical elements are discussed. It is proposed that the described experimental method can be used as a convenient tool for investigations of the dynamics of magnetically induced plasticity of MAEs on the micrometer scale.}, language = {en} }