Venkata Karthik Nadimpalli

Venkata Karthik Nadimpalli
Technical University of Denmark | DTU · Department of Mechanical Engineering

About

21
Publications
6,387
Reads
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164
Citations
Citations since 2017
21 Research Items
164 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
Introduction

Publications

Publications (21)
Conference Paper
Full-text available
Additively manufactured channels enable conformal cooling for applications such as injection molds or fuel injectors. Understanding the scalability of these channels for applications of different sizes is essential to pave the way for a more widespread adoption. This work uses a non-destructive testing approach to characterize and compare channels...
Article
Full-text available
Shielding gas flow is essential to the additive manufacturing (AM) process, and the effects of argon shielding gas flow variation on the macroscopic homogeneity of additive manufactured stainless steel parts have been studied using an open-architecture AM system. Such a variation manifests itself layer-by-layer within one part and part-by-part acro...
Conference Paper
Full-text available
Laser Powder Bed Fusion (L-PBF) has attracted a lot of attention from various industrial sectors and mainly thanks to its well-proven well-known capacity of realizing complex topology-optimized components that have so far been impossible to make using conventional manufacturing techniques. In Pulsed L-PBF (PL-PBF), the laser's temporal profile can...
Article
Full-text available
Directed energy deposition (DED), a typical additive manufacturing technology, is now regarded as a promising technique to further improve the performance of single-crystal (SX) superalloys by minimizing chemical segregation. The multi-track overlapping deposition is an effective way to increase the three-dimensional size of the component, which pr...
Article
Full-text available
The present work explores for the first time additive manufacturing of powder mixtures consisting of Chromium Nitride (Cr2N) and AISI 316L with laser powder bed fusion (L-PBF). The addition of 2.5 wt% Cr2N to an AISI 316L powder resulted in the successful dissolution of both chromium and nitrogen into a fully austenitic stainless steel microstructu...
Article
Full-text available
Laser powder bed fusion (L-PBF) is used to produce foam-like Ni-Mn-Ga with tailored microscale and mesoscale features. Ni50-Mn28.2-Ga21.8 (at%) powder was gas atomised and processed in an L-PBF system with a range of energy density from 26.24 and 44.90 J/mm³. We characterised microscale and mesoscale properties, such as the chemical composition, cr...
Article
Full-text available
This review article provides a comprehensive overview of fiber and nanoparticle reinforced polymer matrix composites (PMC) for their damping and sound absorption properties. It explains the mechanism of damping and sound absorption properties of the material as a first step. Further, the paper discusses the governing parameters of materials respons...
Article
Full-text available
Metal-supported oxide cells (MSCs) are considered as the third-generation solid oxide cells (SOCs) succeeding electrolyte-supported (first generation) and anode-supported (second generation) cells, which have gained much attention and progress in the past decade. The use of metal supports and advanced technical methods (such as infiltrated electrod...
Article
The Directed Energy Deposition (DED) process of metals, has a broad range of applications in several industrial sectors. Surface modification, component repairing, production of functionally graded materials and more importantly, manufacturing of complex geometries are major DED’s applications. In this work, a multi-physics numerical model of the D...
Article
Full-text available
In this study, the manufacturability of new types of steel-steel composites on an open-architecture laser powder bed fusion (LPBF) system is demonstrated. A hard martensitic stainless tool steel 440C and a soft austenitic stainless steel 316L are combined in a “multi-material” component with discrete and continuous material gradients. Interface eng...
Article
Full-text available
Numerical models, especially when validated against experimental findings, are valuable tools that can be used as a cheap and reliable alternative to the expensive and time-consuming experimental investigations. In the current work, a multiphysics model of laser powder bed fusion (L-PBF) has been developed for stainless steel SS 316-L and validated...
Chapter
Additive manufacturing (AM) technologies comprise a family of manufacturing methods that colloquially are known by the common appellation of “3D Printing.” AM has created a strong linkage between digital and physical manufacturing, thus nourishing by its nature, a wider trend, digitization, and the automation of the manufacturing industry. This cha...
Article
Full-text available
Several different interfacial forces affect the free surface of liquid metals during metal additive manufacturing processes. One of these is thermo-capillarity or the so-called Marangoni effect. In this work, a novel framework is introduced for unraveling the effects of thermo-capillarity on the melt pool morpholoogy/size and its thermo-fluid condi...
Conference Paper
Full-text available
The demand for high flexibility and mass customization within medical implants has resulted in the early adoption of additive manufacturing technologies in the medical sector. Apart from offering unique customization opportunities, metal additive manufacturing of implants also enables the generation of functionally structured surfaces showing incre...
Article
Full-text available
Ultrasonic additive manufacturing (UAM) involves ultrasonic welding of similar or dissimilar metal foils on top of a base substrate. UAM can produce solid consolidated structures under optimal processing conditions. However, inter-layer defects such as delamination/kissing bonds (type 1) and inter-track (type 2) defects are common. The authors prev...
Article
Full-text available
In this paper we describe metal additive manufacturing (AM) processes in general, and laser bed fusion processes in particular. The process characteristics are described, and the various modelling approaches demonstrated. The open AM architecture developed at DTU Mechanical Engineering is introduced, as well as an alternative process chain based on...
Article
Full-text available
In this study, micro-computed tomography (CT) is utilized to detect defects of Ti-6Al-4V specimens fabricated by selective laser melting (SLM) and electron beam melting (EBM), which are two popular metal additive manufacturing methods. SLM and EBM specimens were fabricated with random defects at a specific porosity. The capability of micro-CT to ev...
Conference Paper
Full-text available
Most commercially available laser powder bed fusion (L-PBF) systems are limited to process one material at a time. The ability to spatially apply multiple materials within the same component will strongly expand the available design space for engineers. A typical problem with multi-material components is stress concentration at discrete material in...
Conference Paper
Full-text available
The present work focuses on the influence of the composition of the protective gas (argon or nitrogen) used in laser-based powder bed fusion (L-PBF) on the nitrogen content, microstructure and hardness of AISI 316L austenitic stainless steel. L-PBF of AISI 316L powder using Ar gas resulted in loss of nitrogen in the final part. On the other hand, L...
Conference Paper
Ultrasonic Additive Manufacturing (UAM) is a solid-state layer by layer manufacturing process that utilizes vibration induced plastic deformation to form a metallurgical bond between a thin layer and an existing base structure. Due to the vibration based bonding mechanism, the quality of components at each layer depends on the geometry of the struc...
Article
Ultrasonic Additive Manufacturing (UAM) is a layer-by-layer solid-state fusion process that bonds thin metal foils on top of a base substrate by using ultrasonic vibrations. In this study, longitudinal mode ultrasonic nondestructive evaluation (NDE) was used to assess the bond quality of UAM components. An interfacial spring model was developed to...

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