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Item type:Publication, Access status: without files , 145 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Influence of laser beam profile on the selective laser melting process of AlSi10Mg(2020-05-01); ; Selective laser melting (SLM) offers great potential to manufacture customized and complex metallic parts. Major drawbacks that limit its industrial application are the high cost of the process that is related to low process speeds and issues with reproducibility. One important process parameter that has the potential to increase the reproducibility and speed of the process is the laser beam intensity profile. Since its influence has not been sufficiently investigated, the goal of this study is to analyze the effect of the beam profile on the SLM process of AlSi10Mg. Single tracks and density cubes are manufactured with different process parameters and two beam profiles (standard Gaussian and Donut beam profiles) and analyzed with respect to appearance, the size of melt tracks, porosity, and the types of defect. The results reveal several advantages of the Donut beam profile such as fewer defects and a significantly broader process window that promises a more robust process.Publicationtype: Journal Article59 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Biomimetic design and laser additive manufacturing - A perfect symbiosis?(Laser Inst. of America, 2020-03-06); ; ; ; Biomimetics as well as additive manufacturing have prominently produced novel design approaches for parts and products independently from each other. The combination of both has resulted in numerous innovative part designs that were unseen before. However remarkable the marketing impact of individual 3D printed biomimetic parts has been, a widespread industrial application is missing to date. This publication, therefore, takes a closer look at how biomimetic design in additive manufacturing is currently pursued and evaluates the different design approaches based on their suitability for industrial application. The assessment reveals that algorithms and thesaurus tools should be preferred in an industrial biomimetic design process. From the various additive manufacturing methods, laser additive manufacturing today is a dominating industrial application when it comes to metal parts. Thus, several case studies of biomimetic designs produced with laser additive manufacturing are presented. On the basis of the selected examples, the added value through biomimetic design is discussed and reviewed critically, raising the question of when a biomimetic design approach is promising compared to conventional design approaches. Based on the review of current use cases and the potentials that the combination of biomimetics and additive manufacturing offer, recommended fields of research are concluded. Finally, the road to industry for biomimetic additive manufacturing design is outlined, taking into account the findings on existing biomimetic design methodologies and tools.Publicationtype: Journal ArticleScopus© Citations 22 254 498 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Analysis of residual stress formation in additive manufacturing of Ti-6Al-4V(Association for Iron & Steel Technology, 2016-10); ; ; ; Laser Beam Melting (LBM) and Additive Metal Deposition (AMD) offer many advantages such as high freedom in design and short lead times. Although Ti-6Al-4V is one of the most widely used materials in powder bed-based LBM and the nozzle-fed powder-based AMD, the occurrence of residual stresses is still a common cause for failure of parts or even the entire build job. In this paper, the influence of different exposure patterns on the residual stresses is shown. A simulation-based approach is chosen to develop a strategy for further optimization of the exposure. For validation, X-ray diffraction and Crack Compliance Method have successfully been used in first experiments to determine the local distribution of residual stresses for both technologies. The results show a significant variation of the residual stresses.Publicationtype: Conference Paper164 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Influence of process parameters on the quality of aluminium alloy en AW 7075 using Selective Laser Melting (SLM)(Elsevier, 2016-09-16); ; ; ; Selective laser melting (SLM) is an additive manufacturing process, forming the desired geometry by selective layer fusion of powder material. Unlike conventional manufacturing processes, highly complex parts can be manufactured with high accuracy and little post processing. Currently, different steel, aluminium, titanium and nickel-based alloys have been successfully processed; however, high strength aluminium alloy EN AW 7075 has not been processed with satisfying quality. The main focus of the investigation is to develop the SLM process for the wide used aluminium alloy EN AW 7075. Before process development, the gas-atomized powder material was characterized in terms of statistical distribution: size and shape. A wide range of process parameters were selected to optimize the process in terms of optimum volume density. The investigations resulted in a relative density of over 99%. However, all laser-melted parts exhibit hot cracks which typically appear in aluminium alloy EN AW 7075 during the welding process. Furthermore the influence of processing parameters on the chemical composition of the selected alloy was determined.Publicationtype: Journal ArticleScopus© Citations 235 308 419