In this work the effect of heat treatments on the microstructure and mechanical properties of a secondary Al-Si-Cu alloy is studied. A Design of Experiments (DoE) was developed in order to optimize the heat treatment parameters and analyze the dissolution and fragmentation of the iron-rich inclusions as well as the improvement of the mechanical properties by non-equilibrium heat treatments. The iron-rich intermetallic inclusions were characterized as-cast and after heat treatment both by two-dimensional metallography ...

Die Laserstrahlbearbeitung hat sich im Laufe der letzten Jahre zu einem wichtigen Forschungsschwerpunkt in industrieller und akademischer Hinsicht entwickelt. Neben der Erschließung neuer Anwendungsgebiete durch den Vorteil einer hohen Bearbeitungsflexibilität überzeugt die laserbasierte Materialbearbeitung vor allem durch einen lokal beeinflussbaren Energieeintrag. Jedoch sind derzeit mit zunehmender geometrischer Komplexität und Bauteilgröße nur begrenzte Tiefenwirkungen der gewünschten Druckeigenspannungen ...

Biocomposites made of biodegradable polymers have grown in interest due to their environmentally friendliness, considering that non-biodegradable polymers waste conduces to pollution, displaying high environmental impact in climatic changes. Therefore, in the presented study, biodegradable Poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) were investigated as a series of PLA/PBS melt-blending compounds with the weight ratios of 50/50, 60/40, 70/30, 80/20 and 90/10. In a two-component injection molding ...

Rheological properties of polyoxymethylene (POM) and ethylene–octene copolymer (EOC) in solid and melt states were investigated. Blends were prepared with a twin screw extruder at broad component wt-to-wt ratios (10, 30, 50, 70, 90 wt% of EOC). The morphology as well as calorimetric, rheological, and elastic properties of the blends were studied. The investigation showed that POM/EOC blends were heterogeneous in nature and had a broad phase transition region between 30 and 70 wt% of POM. Because during processing ...

Im Rahmen der vorliegenden Arbeit wird die Anwendung der optischen Verformungsmessung auf heterogene Werkstoffsysteme untersucht, wobei dieses Verfahren auf unterschiedlichen Skalenebenen eingesetzt wird. Als erstes wird die digitale Bildkorrelation zur Temperaturüberwachung bei Hochtemperaturzugversuchen bis 350 °C an 0,6 mm dünnen lotplattierten Aluminiumprüfkörpern eingesetzt. Flächige Dehnungsauswertungen innerhalb des Prüfbereichs bestätigen die homogene Temperaturverteilung, wobei die Temperatur gleichzeitig ...

This contribution focuses on an innovative composite material consisting of textile layers made from continuous wooden fibers embedded in a thermoplastic matrix. A finite element simulation of potential use‐cases is planned to support the development process and to study the suitability of the material in an architectural context. The simulation is based on a constitutive model assuming homogenous orthotropic elastic behavior and will be expanded to include multiscale modeling in future research. The material parameters ...