Si/SiC-Ceramic low process shrinkage - high temperature material for the Laser Sinter process

Actual RP-systemsare very limited in producing adequate ceramic prototypes. In the presented process, the SiC..green part manufacturing bythe laser sintering process in combination with special postprocessing allows the fast production of SUSiC prototypes. A mixture of SiC powder and a reactive polymer binder system is used in the Laser Sinter process. In the following postprocessing the porous green part has to be .infiltrated with a precursor resin, carbonised and finally infiltrated withimolten silicon.•Incontrast to cold isostatic moulding or slip casting the shrinkage is very low (2-4 0/0).• Experiments with suitable materials/and process conditions were successful. This paper will show the state of and the possible further investigation into process.Mechanical Engineerin

LAPS - Laser Aided Powder Solidification - Technology for the direct production of metallic and polymer parts

The prototypes of today's commercial available RP-Systems (e.g. StereolithographySystems) are suitable mainly for designing and, if even, for restricted functional tests. From this it can be concluded that for obtaining functional or technical prototypes one has to use time- and cost-intensive downstream-technologies like investment casting. Because of the economical aspects in industries there is a great demand for direct production of functional and technical prototypes. The present paper describes the activities and research results on the development techniques based on laser induced solidification of powder materials for the direct manufacturing ofmetallic parts. Also a various number of polymers, suitable for sintering and remelting, are investigated and presented as functional materials for different applications.Mechanical Engineerin

LAPS - Laser Aided Powder Solidification - Technology for the direct production of metallic and polymer parts

The prototypes of today's commercial available RP-Systems (e.g. StereolithographySystems) are suitable mainly for designing and, if even, for restricted functional tests. From this it can be concluded that for obtaining functional or technical prototypes one has to use time- and cost-intensive downstream-technologies like investment casting. Because of the economical aspects in industries there is a great demand for direct production of functional and technical prototypes. The present paper describes the activities and research results on the development techniques based on laser induced solidification of powder materials for the direct manufacturing ofmetallic parts. Also a various number of polymers, suitable for sintering and remelting, are investigated and presented as functional materials for different applications.Mechanical Engineerin

Systematic Approach for Finite Element Analysis of Thermoplastic Impregnated 3D Filament Winding Structures—Advancements and Validation

This work aims to enhance and validate a systematic approach for the structural finite element (FE) analysis of thermoplastic impregnated 3D filament winding structures (fiber skeletons). The idealized modeling of geometrically complex fiber skeletons used in previous publications is refined by considering additional characteristic dimensions and investigating their mechanical influence. Moreover, the modeling approach is transferred from the meso- to the macro-level in order to reduce modeling and computational effort. The properties of meso- and macro-level FE models are compared using the example of simple loop specimens. Based on the results, respective application fields are defined. In the next step, the same modeling approach is applied to a more complex, three-dimensional specimen—the inclined loop. For its macro-level FE model, additional material characterization and modeling, as well as enhancements in the modeling of the geometry, are proposed. Together with previously determined effective composite properties of fiber skeletons, these results are validated in experimental tensile tests on inclined loop specimens