Rajit Ranjan

Rajit Ranjan
Delft University of Technology | TU · Department of Precision and Microsystems Engineering (PME)

About

16
Publications
7,991
Reads
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112
Citations
Introduction
Rajit is currently pursuing a Ph.D. degree in Mechanical Engineering in the department of Precision and Microsystems Engineering, TU Delft, Netherlands. He has a bachelor's degree in Production engineering from NIT Allahabad, India and a Master's degree in Mechanical Engineering from University of Cincinnati, USA. Further, he has three years of industry experience with Tata Hitachi, India (2 years) and Boeing Research, India (1 year).

Publications

Publications (16)
Article
Full-text available
A novel constraint to prevent local overheating is presented for use in topology optimization (TO). The very basis for the constraint is the Additive Manufacturing (AM) process physics. AM enables fabrication of highly complex topologically optimized designs. However, local overheating is a major concern especially in metal AM processes leading to...
Article
Full-text available
The powder bed fusion (PBF) process is a type of Additive Manufacturing (AM) technique which enables fabrication of highly complex geometries with unprecedented design freedom. However, PBF still suffers from manufacturing constraints which, if overlooked, can cause various types of defects in the final part. One such constraint is the local accumu...
Conference Paper
Full-text available
Additive Manufacturing (AM) offers unprecedented design freedom that allows for manufacturing highly complex and efficient engineering structures. However, parts produced using AM still suffer from certain defects. For example, in the context of metal parts, local accumulation of heat leads to inferior surface quality [1]. Also, high thermal gradie...
Article
Full-text available
Numerous challenges of additive manufacturing (AM) are tackled in the European Horizon 2020 project PAM^2 by studying and linking every step of the AM process cycle. For example, PAM^2 researchers from the design, processing and application side have collaborated in this work to optimise the manufacturability of metal AM parts using an improved Top...
Conference Paper
Full-text available
One of the primary advantages that Additive Manufacturing (AM) offers, as opposed to conventional manufacturing techniques, is the increased design freedom. The layer-by-layer deposition of material enables manufacturing of highly complex, high performance engineering structures without increasing the associated cost. Powder Bed Fusion (PBF) proces...
Conference Paper
Full-text available
The additive manufacturing (AM) of injection molding inserts has gained popularity during recent years primarily due to the reduced design-to-production time and form freedom offered by AM. In this paper, topology optimization (TO) is performed on a metallic mold insert which is to be produced by the Laser Powder Bed Fusion (LPBF) technique. First,...
Poster
Full-text available
This work presents the redesign of an injection molding metal insert to be prototyped by the Laser Powder Bed Fusion (LPBF) process. The case study has been topology optimized to minimize its total mass while keeping the maximum von Mises stress and maximum displacement under load condition below chosen thresholds. Particular attention has been giv...
Conference Paper
Full-text available
PAM^2, which stands for Precision Additive Metal Manufacturing, is a European MSCA project in which 10 beneficiaries and 2 partners collaborate on improving the precision of metal Additive Manufacturing. Within this project, research is done for each process stage of AM, going from the design stage to modelling, fabricating, measuring and assessmen...
Conference Paper
Full-text available
Additive Manufacturing (AM) technology offers unprecedented design freedom and allows for manufacturing highly complex, more efficient engineering structures without increasing the associated cost. Topology optimization (TO) on the other hand has been recognized as an ideal design tool which allows for maximum design freedom and hence can exploit t...
Article
Metal Additive Manufacturing (AM) processes have made it possible to build parts with complex geometric features by adopting a layer-by-layer approach. However, additional support structures are needed to support overhanging surfaces and reduce distortion that may occur in these parts. This increases the overall build time of the part and leads to...
Conference Paper
Full-text available
Additive Manufacturing (AM) enables fabrication of geometrically complex designs and hence offers increased freedom for designers. It has been recognized that topology optimization can serve as an ideal design tool in order to fully exploit the advantages offered by AM. However, AM processes have specific limitations which should be taken into acco...
Article
Additive manufacturing (AM) processes are used to fabricate complex geometries using a layer-by-layer material deposition technique. These processes are recognized for creating complex shapes which are difficult to manufacture otherwise and enable designers to be more creative with their designs. However, as AM is still in its developing stages, re...
Article
Additive Manufacturing (AM) processes are used to fabricate complex parts using a layer by layer approach. This enables designers to be more creative with their designs and build parts which may be difficult to manufacture using conventional processes. However, as AM is in its infancy, relevant literature with respect to design guidelines for AM is...

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Projects

Project (1)
Project
Objective of this research is to develop advanced (computational) design tools, enabling competitive designs, better use of AM possibilities against minimal design costs and reduced time-to-market. (https://www.pam2.eu/)