Numerical and experimental study of additive manufactured Ti6Al4V lattice structuresWednesday (08.11.2017) 16:20 - 16:40 Part of:
Additive manufacturing technologies such as selective laser melting (SLM) are, due to their high geomet-ric freedom of design, ideal for the production of complex, cellular lightweight structures. The selective adaption of design to the loading conditions plays a key role in this context. A better understanding of the mechanical behavior of lattice structures is essential for utilizing the high potential of SLM. The ex-perimental and numerical investigations of two different types of Ti6Al4V lattice structures are the focus of this study. The structures were heat-treated to achieve a ductile behavior and tested mechanically un-der monotonic uniaxial loading. Digital Image Correlation (DIC) was conducted for detail analysis of the local strain distribution during deformation of the structures. Electron Backscatter Diffraction (EBSD) analysis, as well as scanning electron microscopy (SEM), were carried out to characterize the microstruc-tural properties and the surface quality of the specimens. In order to decrease computing effort, a finite-element model (FEM) was developed by the exclusive use of beam elements. A comparison between numerical studies using digital image correlation allows conclusions to be made regarding the accuracy of the FEM model. The results depict the characteristic properties and differences between the examined lattice structures and typical failure mechanisms under loading: both methods, experimental procedure and the theoretical FE- model, show good correlation.