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Item type:Publication, Access status: with files , Design guidelines for metal binder jettingIn addition to the general advantages of additive manufacturing technologies, such as the resource-efficient production of highly complex components, the metal binder jetting (MBJ) process enables a more cost-effective manufacturing of metal additive components. However, the design freedoms gained by additive manufacturing, and MBJ in particular, are also accompanied by new design restrictions for component design. While a large number of design guidelines are already available for the established additive manufacturing processes, the metal binder jetting process imposes additional requirements on component design, which are currently only inadequately covered in the literature. Therefore, this paper presents the development and derivation of first design rules for the metal binder jetting process using martensitic stainless steel (17–4 PH). In this way, the paper also provides a methodology for deriving guidelines regardless of the material. In total, 13 guidelines have emerged from this, which in part both confirm existing guidelines, but also extend them.Publicationtype: Journal ArticleScopus© Citations 3 59 191 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Automated design of 3D-printed silicone parts : a case study on hand rehabilitation gloves for stroke patientsThis paper presents an innovative way to customize silicone products by utilizing a design automation process and extrusion-based silicone 3D printing as a manufacturing technique. A customizable rehabilitation glove for stroke patients is used as an example to demonstrate the process chain. Soft robotics offers unique possibilities for the use of rehabilitation devices in a homecare setting and has the potential to support the healing process throughout the different steps of neurorehabilitation. Furthermore, customization of such devices can make physical therapy more comfortable and effective for the patient. The presented process chain combines pose detection with parametric design in order to adapt a glove consisting of soft bending actuators to the hand of a patient, which can be manufactured in a single day.Publicationtype: Book part16 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Toward automated topology optimization : identification of non-design features of CAD models using graph neural networksThis paper presents an automated identification of non-design features of CAD models for topology optimization using learning-based segmentation. The CAD files are taken from a large database of industry-relevant components. Based on the geometry and topology of the components, a graph structure is created and processed by a deep neural network. The results show good match with real cases and can be continuously improved by training with additional data.Publicationtype: Book part21 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , On the effectiveness of triply-periodic minimal surface structures for heat sinks used in automotive applicationsThis study compares the effectiveness of heat sinks based on triply-periodic minimal surface (TPMS) as well as conventional pin fin structures used in automotive applications. Thermal and fluid mechanical properties of the heat sinks are investigated through computational fluid dynamics simulations. The results demonstrate that, with the same boundary conditions, some TPMS-based heat sinks can dissipate more heat than their counterparts with conventional pin fins, while still staying within the allowed pressure drop range.Publicationtype: Conference Paper24 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Methodology for integrating biomimetic beams in abstracted topology optimization results(American Society of Mechanical Engineers (ASME), 2022-10); ; ; ; This paper presents a five-step design methodology to generate designs of biomimetic structural components from topology optimization results. In step one, all material allocated by topology optimization is classified as either beam like structures or nodes to generate an auxiliary model consisting of preserved regions, cylindrical beams, and ball nodes, which is an abstraction of the original topology optimization result. In step two, the auxiliary model is exposed to the original boundary conditions in a finite element analysis. Then, internal forces, torsion, and bending moments in all beams of the auxiliary model are identified with respect to both of their ends. In step three, a database is used to find a suitable biomimetic beam for each previously analyzed beam in the auxiliary model. In step four, adapted nodes are designed to connect the biomimetic beams and preserved regions to generate an intermediate biomimetic component design. And in step five, a design iteration and a validation of the final design are performed. The design methodology allows for reproducible bio-mimetic component designs, a trackable and easily documentable component development process, and the possibility of automating the design process to ultimately save development costs when designing structural components.Publicationtype: Conference Paper55 175 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Recycling-oriented fabrication of soft robots(2022-04); Climate change is continuing, and more environmental awareness is required these days. In this context, plastics are a controversial topic. On top of this, a current plastics-based field of research is developing with great interest: soft robotics. Soft robots are generally made of elastomers, for which recycling is rather difficult. An implementation of recycling in soft robotics is still pending. This paper aims to show to what extent three typical materials used in soft robotics (Ecoflex 00-30, Elastosil M4601, and Sylgard 184) can be reintroduced in powder form into the manufacturing process after use and what mechanical properties such recyclates have.Publicationtype: Conference Paper17 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Fluid-structure interaction modelling of a soft pneumatic actuator(Multidisciplinary Digital Publishing Institute (MDPI), 2021-07-15); ; This paper presents a fully coupled fluid-structure interaction (FSI) simulation model of a soft pneumatic actuator (SPA). Previous research on modelling and simulation of SPAs mostly involves finite element modelling (FEM), in which the fluid pressure is considered as pressure load uniformly acting on the internal walls of the actuator. However, FEM modelling does not capture the physics of the fluid flow inside an SPA. An accurate modelling of the physical behaviour of an SPA requires a two-way FSI analysis that captures and transfers information from fluid to solid and vice versa. Furthermore, the investigation of the fluid flow inside the flow channels and chambers of the actuator are vital for an understanding of the fluid energy distribution and the prediction of the actuator performance. The FSI modelling is implemented on a typical SPA and the flow behaviour inside the actuator is presented. Moreover, the bending behaviour of the SPA from the FSI simulation results is compared with a corresponding FEM simulation.Publicationtype: Journal ArticleScopus© Citations 16 115 171 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Compression behavior of typical silicone rubbers for soft robotics applications at elevated temperatures(2021-04-12); ; ; In this communication, we analyze the compression behavior of typical silicone rubbers used in soft robotics applications at elevated temperatures. In particular, compression experiments according to ISO 7743 are performed with three mixing ratios (base polymer to curing agent) of Sylgard, Elastosil, and Ecoflex at 24 °C (room temperature), 30 °C, 40 °C, 50 °C, and 60 °C. Furthermore, typical hyperelastic material models are fitted to the measured stress-strain curves for room temperature. It is shown that the (third-order) Yeoh model shows the best overall fit, and the corresponding model parameters are stated.Publicationtype: Conference Paper43 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Toward industrial silicone 3D printing of soft robots(2021-04-12); ; ; So far, the soft robotics community has been concerned with making progress in the field and less with transferring the new knowledge into industrial applications. Especially extrusion-based silicone 3D printing of soft robotic structures is still in its infancy, as industrial silicone 3D printers are rare and not readily applicable. Here, we describe our first steps toward industrial silicone 3D printing of soft robots in terms of design guidelines for manufacturing and function.Publicationtype: Conference Paper27 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Remote control of a soft walking robot(2021-04-12); This paper develops an intuitive user interface in order to operate a gecko-inspired soft robot remotely by using a joystick. The developed method enables the operation of the comparatively fast robot by the untrained human user, which is a further step towards making the robot usable for industrial applications.Publicationtype: Conference Paper28