This paper focusses on the investigation of the mechanical properties of lattice structures manufactured by selective laser melting using contour-hatch scan strategy. The motivation for this research is the systematic investigation of the elastic and plastic deformation of TiAl6V4 at different strain rates. To investigate the influence of the strain rate on the mechanical response (e.g., energy absorption) of TiAl6V4 structures, compression tests on TiAl6V4-lattice structures with different strain rates are carried out to determine the mechanical response from the resulting stress-strain curves. Results are compared to the mechanical response of stainless steel lattice structures (316L). It is shown that heat-treated TiAl6V4 specimens have a larger breaking strain and a lower drop of stress after failure initiation. Main finding is that TiAl6V4 lattice structures show brittle behavior and low energy absorption capabilities compared to the ductile behaving 316L lattice structures. For larger strain rates, ultimate tensile strength of TiAl6V4 structures is more than 20% higher compared to lower strain rates due to cold work hardening
The emerging Additive Manufacturing (AM) and especially the Selective Laser Melting (SLM) technologies provide great potential for solving the dilemma between scale and scope, i.e. manufacturing products at mass production costs with a maximum fit to customer needs or functional requirements. Due to technology intrinsic advantages like one-piece-flow capability and almost infinite freedom of design, Additive Manufacturing was recently even described as "the manufacturing technology that will change the world". Due to the complex nature of production systems, the technological potential of AM and especially SLM can only be realised by a holistic comprehension of the complete value creation chain, especially the interdependency between products and production processes. Therefore this paper aims to give an overview regarding recent research in machine concepts and process development as well as component design which has been carried out within the cluster of excellence "Integrative production technology for high wage countries".
Standard finger implants, manufactured by conventional techniques (e.g. machining), as they are used today for patients suffering from inflammatoryrheumatic diseases such as rheumatoid arthritis (RA) or degenerative diseases like osteoarthritis, are lacking of individuality and long‐term stability. In this study here, a way to generate patient tailored finger implants based on XtremeCT technique is described. First finger implants are manufactured by Selective Laser Melting (SLM) and illustrate the feasibility of manufacturing patient tailored implants with additional functionalities. A technical abstraction of the original 3D‐CAD file lead to major functional improvements by adjusting the stiffness of patient tailored implants to imitate bone. This results in less stress shielding and a better long‐term stability of the implant as it needs to be reconfirmed in further clinical studies.
Selective laser melting (SLM) is a manufacturing process that builds up metallic or ceramic parts layer by layer directly from 3D-computer-aided design data, offering, for example, the advantage of imposing little restrictions in terms of geometric complexity. One of the main challenges of the SLM process is to improve its efficiency by increasing the build rate of the process and thereby decreasing time and cost. One way of achieving this is increasing the applied laser power and beam diameter, thereby melting more volume in a shorter period of time. Another option of improving efficiency is reducing the volume of the material which has to be melted, made possible by the aforementioned limitless geometric freedom offered by the SLM process. Hereby, one can generate hollow parts for better exploitation and adaption of the volume to specific load cases. Large volumes can be replaced by lattice structures with a certain volume fraction, saving weight and production time by maintaining the stiffness of the structure. To ensure the mechanical properties of the new light-weight structures are comparable to the properties of conventional solid base material, several different lattice structures have already been investigated, all consisting of countless little struts. Therefore, here various formats of single-and multistruts have been built to investigate the scalability of the produced material's mechanical properties. This paper presents the results, which will be used for better prediction of mechanical properties of SLM manufactured lattice structures
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