Markus Merkel
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View article: An analysis of technical and economic aspects of digital spare parts on variating materials in powder bed fusion of metals using a laser beam (PBF‐LB/M)
An analysis of technical and economic aspects of digital spare parts on variating materials in powder bed fusion of metals using a laser beam (PBF‐LB/M) Open
Conventional supply chains depend on spare part inventories for rapid failure response. Metal additive manufacturing enables decentralized, on‐demand production, reducing inventory needs. Current research focuses on redesigning spare parts…
View article: Minimum and Stable Coefficient of Thermal Expansion by Three-Step Heat Treatment of Invar 36
Minimum and Stable Coefficient of Thermal Expansion by Three-Step Heat Treatment of Invar 36 Open
The low coefficient of thermal expansion of Invar 36 represents a significant consideration in light of its potential effects, particularly in industrial applications where thermal stability is of paramount importance. In light of this, a …
View article: Minimum and Stable Coefficient of Thermal Expansion by Three-Step Heat Treatment of Invar 36
Minimum and Stable Coefficient of Thermal Expansion by Three-Step Heat Treatment of Invar 36 Open
The low coefficient of thermal expansion of Invar 36 represents a significant consideration in light of its potential effects, particularly in industrial applications where thermal stability is of paramount importance. In light of this, a …
View article: Simulating Elastoplastic and Anisotropic Behavior in Thermoplastic Additively Manufactured Components: An Application-Oriented Modeling Approach
Simulating Elastoplastic and Anisotropic Behavior in Thermoplastic Additively Manufactured Components: An Application-Oriented Modeling Approach Open
This paper presents a comprehensive approach aimed at developing a coupled process-structure simulation that integrates anisotropic and elastoplastic material behavior for plastic components manufactured through Fused Filament Fabrication …
View article: Characterization of flexural fatigue behaviour of additively manufactured (PBF–LB) gyroid structures
Characterization of flexural fatigue behaviour of additively manufactured (PBF–LB) gyroid structures Open
Additive manufacturing (AM) holds remarkable potential for producing cellular materials with intricate structures and tailored mechanical properties. The study investigates the flexural fatigue behaviour of additively manufactured triply p…
View article: Influence of Chord Length and Load Distribution Modification on the Sound Emission and Efficiency of a Benchmark Fan
Influence of Chord Length and Load Distribution Modification on the Sound Emission and Efficiency of a Benchmark Fan Open
The design parameters of axial fans, such as load distribution over the blade, chord length and the angle of attack, significantly influence the resulting aerodynamic and aeroacoustic properties of the fans.Based on an international benchm…
View article: Additive Manufacturing of WC-Co Specimens with Internal Channels
Additive Manufacturing of WC-Co Specimens with Internal Channels Open
Most material removal in modern manufacturing is currently performed using tools with indexable inserts. Additive manufacturing allows for the creation of new, experimental insert shapes and, more importantly, internal structures, such as …
View article: One-Dimensional Finite Elements
One-Dimensional Finite Elements Open
The textbook introduces the finite element method and explains the complex method using only one-dimensional elements.
View article: A Study on Additive Manufacturing of Metal Components for Mobility in the Area of After-Sales with Spare and Performance Parts
A Study on Additive Manufacturing of Metal Components for Mobility in the Area of After-Sales with Spare and Performance Parts Open
Mobility is undergoing changes. Increasingly strict legislation regarding pollutant emissions and the protection of the environment are more important than ever. The change to electric mobility is also presenting the mobile world with new …
View article: Additive vs. Conventional Manufacturing of Metal Components: Selection of the Manufacturing Process Using the AHP Method
Additive vs. Conventional Manufacturing of Metal Components: Selection of the Manufacturing Process Using the AHP Method Open
Additive manufacturing (AM) processes have experienced significant technological developments over the past decade. Today, 3D-printed metal parts can almost achieve the mechanical properties of conventionally manufactured components; proce…
View article: A Study on Additive Manufacturing for Electromobility
A Study on Additive Manufacturing for Electromobility Open
Additive manufacturing (AM) offers the possibility to produce components in a resource-efficient and environmentally friendly way. AM can also be used to optimise the design of components in mechanical and physical terms. In this way, func…
View article: Thermal expansion and temperature-dependent Young’s modulus of Invar fabricated via laser powder-bed fusion
Thermal expansion and temperature-dependent Young’s modulus of Invar fabricated via laser powder-bed fusion Open
Invar alloys possess the peculiarity of dimensional invariance, which is of importance for high precision applications, such as measurement instruments. As ductile face-centered cubic (fcc) material, it is adequately weldable and is nowada…
View article: Impact of corrosion on mechanical properties of additively manufactured Invar 36
Impact of corrosion on mechanical properties of additively manufactured Invar 36 Open
Invar alloys are used for high‐precision applications due to their invariance of the coefficient of thermal expansion over a temperature range up to about 250 °C. The present study determines the mechanical and corrosive properties of Inva…
View article: Design of Fiber-Composite/Metal–Hybrid Structures Made by Multi-Stage Coreless Filament Winding
Design of Fiber-Composite/Metal–Hybrid Structures Made by Multi-Stage Coreless Filament Winding Open
Additive manufacturing processes, such as coreless filament winding with fiber composites or laser powder bed fusion with metals, can produce lightweight structures while exhibiting process-specific characteristics. Those features must be …
View article: Tungsten Carbide-Cobalt: with 3D metal printing to wear-resistant coatings for technical applications
Tungsten Carbide-Cobalt: with 3D metal printing to wear-resistant coatings for technical applications Open
The mechanical protection of component surfaces sliding on each other against wear, as in mechanical seals, can typically be achieved by the deposition of hard coatings.Depending on the kind of application suitable material combinations an…
View article: Additive manufacturing of steel for digital spare parts – A perspective on carbon emissions for decentral production
Additive manufacturing of steel for digital spare parts – A perspective on carbon emissions for decentral production Open
Digitization is one of the megatrends of our time. New production and supply chain methods are introduced in the industry, which fundamentally change the previous workflows. An area in which digitization can bring about major changes in th…
View article: Additive Manufacturing of Tungsten Carbide Surfaces with Extreme Wear Resistivity
Additive Manufacturing of Tungsten Carbide Surfaces with Extreme Wear Resistivity Open
Steel surfaces have been coated with Co-based tungsten carbide (WC) in an additive printing process. This process leads to compact and extremely mechanically stable surfaces. We performed tribological measurements using WC counter bodies u…
View article: Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion
Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion Open
Hot isostatic pressing can be utilized to reduce the anisotropic mechanical properties of Al–Si–Mg alloys fabricated by laser powder-bed fusion (L-PBF). The implementation of post processing densification processes can open up new fields o…
View article: The Dimensional Accuracy of Thin-Walled Parts Manufactured by Laser-Powder Bed Fusion Process
The Dimensional Accuracy of Thin-Walled Parts Manufactured by Laser-Powder Bed Fusion Process Open
Laser-Powder Bed Fusion brings new possibilities for the design of parts, e.g., cutter shafts with integrated cooling channels close to the contour. However, there are new challenges to dimensional accuracy in the production of thin-walled…
View article: Additive manufacturing of AlSi10Mg samples using the selective laser melting technique: correlation between tensile and torsion behaviour
Additive manufacturing of AlSi10Mg samples using the selective laser melting technique: correlation between tensile and torsion behaviour Open
Additive manufacturing offers unique possibilities to produce complex components, which would not be possible or only very difficult to be realizable with conventional manufacturing processes. The potential of additive manufacturing of alu…
View article: Tensile and compressive behaviour of additively manufactured AlSi10Mg samples
Tensile and compressive behaviour of additively manufactured AlSi10Mg samples Open
Laser powder-bed fusion has become one of the most important techniques in additive manufacturing. For guaranteeing the possibility of manufacturing highly specialized and advanced components, currently intensive research is carried out in…
View article: Fatigue Behavior of the Additively Manufactured Tool Steel H13 after Surface Treatment using Different Post-Processing Methods
Fatigue Behavior of the Additively Manufactured Tool Steel H13 after Surface Treatment using Different Post-Processing Methods Open
The industry's interest in additively manufactured components is steadily growing. Against the background of an increased understanding of the static characteristic values, the focus is now moving towards the dynamic strengths. Hence, the …
View article: A deep learning-based model for defect detection in laser-powder bed fusion using in-situ thermographic monitoring
A deep learning-based model for defect detection in laser-powder bed fusion using in-situ thermographic monitoring Open
Additive manufacturing of metal components with laser-powder bed fusion is a very complex process, since powder has to be melted and cooled in each layer to produce a part. Many parameters influence the printing process; however, defects r…