INVESTIGATION OF DYNAMICS MECHANICAL BEHAVIOUR OF STAINLESS STEEL STRUCTURES PRODUCED BY THE SELECTIVE LASER MELTING TECHNIQUE


GÜMRÜK R., KULEYİN H., MİNES B.

International Journal of Engineering, Technology and Natural Sciences, vol.1, no.1, pp.23-30, 2016 (Peer-Reviewed Journal)

Abstract

Laser technology due to its novel capability promotes researchers to develop the complex structures like cellular materials with the more efficient and controllable mechanical responses in the application. For cellular structures like lattice, the mechanical properties depend on static and dynamic material response as well as their micro topology. In this study, it is therefore investigated the strain rate dependence of stainless steel micro struts and micro-lattice structures manufactured using selective laser melting technology, as well as the static mechanical behavior. For this purpose, a tensile test and the Split-Hopkinson bar technique were used to determine the stress-strain curves of micro struts under different strain rates and the Cowper-Symond coefficients. The results of the study demonstrated that the stainless steel micro struts manufactured by using the Selective Laser Melting Method exhibited dependence to the strain rate at relatively lower strain rate values – in a manner similar to the bulk material