Forming of Additively Manufactured Sandwich Sheet Composites with Optimized Core Structures

Funding: German Research Foundation (DFG)
Project: TE 508/50-1
Contact: Stephan Rosenthal M. Sc.

In cooperation with the Institute of Product Engineering of the University of Duisburg-Essen sandwich sheets with optimized core structures for the use in forming technologies are developed and additively manufactured.

Due to the high degree of design freedom in additive manufacturing the development of the core structure needs to be carried out with the help of numerical simulation tools. Therefore, the material and semi-finished parts used need to be characterized. The results reveal a highly anisotropic yield behavior as well as tensile-compression asymmetry. The microstructure develops, depending on the manufacturing parameters used, as a highly oriented cellular dendritic structure. Thus, a yield criterion that is capable of describing these effects is considered. The experimentally investigated yield loci in the figure show a transversal isotropy with similar properties in the build-plane of the additive manufacturing process.

Yield loci of additively manufactured Hastelloy X with transversal isotropy