Subproject 11: Methodical development of active multi matrix composite (MMC) components
Table of contents
Motivation
To achieve 3D deformations along a defined path or for force transmission based on the elastic deformation of individual sections, this subproject addresses so-called trajectory flexible mechanisms. The large variety of potential applications for this type of compliant mechanisms requires the development of a systematic method for designing and manufacturing these structures.
State of the art and preliminary research
The design and synthesis processes for coplanar compliant structures with material-integrated drive components that were generated by the 1st cohort must now be extended to so-called non-coplanar mechanisms. Therefore, material- and structure-based anisotropic effects are employed to achieve coupling within the strain tensor. Thus, spatial motion can be derived from planar stimulation. Previous approaches - partially also developed within the framework of SFB 639 - for textile reinforced structures [1] must now be generalized and adjusted according to generic guide mechanisms using application-specific tools. Genetic algorithms can be employed to develop calculation tools for these structures. There are only a few research papers available in the literature [2, 3] that have addressed this topic, whereas none of them involves structurally integrated actuators. In conclusion, there is a considerable demand for research in this regard.
Scientific questions and project objectives
The 2nd cohort is aimed at extending the integral constructive calculation model to three-dimensional deformation. Thus, in a first step, the fundamental structural analysis must be extended to the micro level since this will allow targeted local material adaption during the iterative construction phase. In order to fully automate the entire iterative design and manufacturing process, modified interfaces between computing environment and CAM software must be developed. The validation of results of both paths (3D mechanisms + 2.5D mechanisms) will be achieved by manufacturing a multi-material mechanism with integrated textile based actuators and sensors. For this purpose, additive manufacturing has proven to be an efficient method for demonstrator production.
References
| [1] | KOCH, I.; ZSCHEYGE, M.; GOTTWALD, R.; LANGE, M.; ZICHNER, M.; BÖHM, R.; GRÜBER, B.; LEPPER, M.; MODLER, N.; GUDE, M.: Textile-Reinforced Thermoplastics for Compliant Mechanisms – Application and Material Phenomena, Advanced Engineering Materials 18(3) (2015) |
| [2] |
SAXENA, A.: Synthesis of Compliant Mechanisms for Path Generation using Genetic Algorithm, Journal of Mechanical Design, 127 (2005), 745-752 |
| [3] |
SHARMA, D.; DEB, K.; KISHORE, N.N.: Towards Generating Diverse Topologies of Path Tracing Compliant Mechanisms Using A Local Search Based Multi-Objective Genetic Algorithm Procedure, Proceedings of the World Congress on Computational Intelligence (WCCI-2008), (Hong Kong), Piscatway: IEEE Press . pp. 2004-2011 |
Kontakt
Institute of Lightweight Engineering and Polymer Technology (ILK), Chair of Function-Integrative Lightweight Engineering, Faculty of Mechanical Science and Engineering at TU Dresden
© Christian Hüller
Chair of Function-integrative Lightweight Engineering
NameProf. Dr.-Ing. Niels Modler
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