Projekte – Institut für Werkstoffkunde – Leibniz Universität Hannover

Additive manufacturing of 3D-multi-material components for laser powder bed fusion

With the help of laser powder bed fusion, 3D-multi-material components with an arbitrary material distribution in all three spatial directions can be realized: On the one hand, the porperties in the component can be adjusted voxel-wise, thus resolving conflicts of objectives, and on the other hand, additive manufacturing offers a high degree of design freedom.

Jahr: 2020

Förderung: Leibniz University of Hannover

Additive manufacturing of functionally graded metals with coaxial powder-wire-hybrid feed

By the processing of multi-materials with different compositions within one component, Functionally Graded Additive Manufacturing (FGAM) offers great potential for the demand-oriented design of additively manufactured functional components: By distributing different materials, the mechanical, thermal, chemical, magnetic and electrical properties of additively manufactured components can be adjusted with local resolution.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Additive manufacturing of integrated piezoresistive sensors

Compared to conventional manufacturing processes, Additive Manufacturing offers a wide range of new design options, including a high potential for function integration. Fused Layer Modeling provides the possibility of combining several materials in one component without an additional joining process. For example, functions based on locally adapted thermal or electrical conductivity can be integrated into one component and piezoresistive structures can be realized by means of local application of composite materials.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Additive production of functionalized silicone optics

While additive manufacturing technologies for metals and polymers have been employed successfully in industry for many years, research into the generative production of silicones is still in its infancy. Especially with regard to optical elements such as lenses, this material class offers a high potential, since it can withstand higher ambient temperatures than polymers and can also be reversibly deformed by mechanical force.

Jahr: 2020

Förderung: Leibniz University of Hannover

Atomic Layer Deposition for conformal surface functionalization of parts produced by additive manufacturing

Additive Manufacturing Processes enable the realization of components with complex geometries using new material combinations. In addition to the mere fulfilment of structural-mechanical tasks, these components will have to offer additional functional properties to an increasing extent in the future. The surface quality, which is closely linked to the respective additive manufacturing process, often limits their possible applications. Restrictions can arise directly from the microstructure and the chemical and physical properties of the material combinations used.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Degradation behaviour of additively manufactured components with local functional properties

Additively manufactured components with integrated functional areas or density gradients lead to the challenge that these may have a negative influence on important technological properties such as mechanical strength or corrosion resistance. Therefore, a comprehensive characterization of the property profile of functional components is required in order to establish the relationship between local microstructural features and degradation behaviour under mechanical load. With these data, additively manufactured functional components can be developed with regard to their intended field of application.

Jahr: 2020

Förderung: Nds. Ministerium für Wissenschaft u. Kultur

Laufzeit: Förderung seit 2020

Development of hybrid material systems with sensor properties

Additive Manufacturing processes are becoming increasingly important regarding locally adapted material properties and functional integration. During the manufacturing process, inherent material properties can be specifically tailored to the respective area of application. Both the mechanical-technological and the physical properties of a component can be specifically modified.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Five-axis Adaptive Manufacturing of Fiber-reinforced Plastic Components

A decisive factor for energy-efficient mobility is the payload ratio, which can be optimised implementing lightweight construction concepts. As the already existing lightweight applications are highly uneconomical for small series and their possible applications are limited, alternative production concepts have to be developed.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Functional nanoswitches for additively manufactured materials

In the development of new Additive Manufacturing processes, the integration of precision optical functions places the highest demands on manufacturing tolerances. The required selective modern materials require an adaptation of the properties to a certain effect. Complex nanoswitches offer such physico-chemical property changes. Nanoswitches are able to change between different energetic electronic states physically and chemically. In doing so, properties such as refractive index, color, size, modulus of elasticity etc. change.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Non-destructive optical characterization of microoptical systems

The Additive Manufacturing of microoptical systems allows the efficient realization of novel optical structures. For the further development and improvement of manufacturing processes and optical designs, a comprehensive characterization of the manufactured components is necessary. To date, destructive methods or functional tests are the only options available for optical characterization. However, there is a great need for new, non-destructive methods for the three-dimensional characterization of optical components.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Passive control elements for intelligent flow control in heat exchangers

Heat exchangers are the most frequently used devices in energy and process engineering plants. Typically, one heat-emitting and one heat-absorbing fluid is involved and these are designed for a nominal load point with regard to flow rates and temperature level. In the partial load range, for example, the flow rates of the fluids can deviate significantly from the nominal load case, which typically leads to incorrect distributions and consequently poor efficiency of the apparatus.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Process-integrated self-regulation of the Wire and Arc Additive Manufacturing (WAAM) process to produce graded designed materials

How can the WAAM printer learn the height offset from its own process data in order to generate fully automatic three-dimensional graded designed components? In the future, a process-dependent variable for working in the third dimension can be extracted from the arc process itself. The self-regulating process becomes intelligent! The traditional approach of slicing can be transferred by the development of a point-to-point control to the robot based WAAM technology in kind of a self-controlled process to vary the possibilities to produce specially designed materials.

Jahr: 2020

Förderung: Nds. Ministerium für Wissenschaft u. Kultur

Laufzeit: Förderung seit 2020

Restriction-compliant design of additively manufactured functionalised structural components

Within this project, a methodology for designing functional structural components manufactured by SLM processes will be developed. Special attention will be paid to the designing of new components by using knowledge about components’ conditions under the influence of mechanical loads.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Simulation and concept development for implants made of graded materials

The use of graded materials with locally adapted properties can offer great added value for a variety of different applications. In biomedical engineering, such graded materials are of particular interest for implants, since the bimodal porous structure of bones can be reproduced and thus local mechanical properties such as stiffness or strength. For the development of implants, the stresses that occur during usage must be known and taken into account during construction.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Simulation of the laser metal deposition process using meshfree methods

Additive manufacturing has great potential for the realization of end products with optimized geometry and tailored material properties. The laser metal deposition process (LMD process) is an excellent option for depositing high-precision materials at various locations and is therefore a suitable process for the production of multi-materials. However, the uncertain quality of the final additively manufactured component has so far been a major obstacle for the industrial application of Additive Manufacturing.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Strategies to increase product sustainability by Selective Laser Melting

In this project, the potential of the industrial production of metallic components using Selective Laser Melting (SLM) as an Additive Manufacturing process is to be analysed with regard to ecological sustainability - defined by energy consumption over the product life cycle. The conditions under which SLM is more sustainable than existing conventional processes will be specified. This project focuses on functionalized structural components. The aim is to provide product design and quality engineers with a set of rules and to show potentials for improvements in sustainability.

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture

Targeted assembly of functional nanostructures by means of additive manufacturing

The advantage of the wet chemical process for the production of nanoparticles is that various inorganic materials can be grown on many billions of nanoparticles with the precision of a few atomic monolayers. A variety of wet-chemical "bottom-up" production methods for nanoparticles of different sizes, shapes and material compositions are already known. Many of the resulting nanoscale materials have fascinating physical and chemical properties that are of great interest for a broad range of applications (e.g. catalysis, photocatalysis and sensor technology).

Jahr: 2020

Förderung: Lower Saxony Ministry for Science and Culture