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Yash Mittal
Total Earnings
$218.40
Education
PHD Mechanical Engineering Indian Institute of Technology - Bombay 2024
Experience
Rapid Manufacturing Lab
| Research Scholar
Mumbai, India
I am a direct-to-PhD research scholar, working on multi-axis hybrid extrusion of thermoplastics. I am excelled in CAD modeling, 3D printing, Fused Deposition Modeling. My research interests also lies in biomedical devices and restorative technologies.
Projects & Publications
Mathematical Modelling of Pattern Sublimation in Rapid Ice Investment Casting
01 Jul 2020 to 26 Jul 2021 Link
Investment Casting (IC), using the wax pattern, produces metal parts with a high surface finish and complex geometries within acceptable tolerances. However, removing the wax patterns can have processing challenges, such as thermal expansion during wax melting for pattern removal leading to shell cracking defects, the release of hydrocarbons from melting wax, and the burnt residue from this process. To overcome these challenges, it has been proposed to replace wax with ice as a pattern material. Ice has an inherent benefit of reduction of volume during its phase change from solid to liquid. It helps to reduce cracking due to expansion. Rapid Freeze Prototyping (RFP) and Freeze Cast Process (FCP) can produce the ice pattern. In the process of Rapid Ice Investment Casting (RIIC), the ice pattern is invested with a low-temperature ceramic slurry to make ceramic shells for metal casting. Sublimation is used for ice pattern evacuation at sub-zero conditions using a vacuum. Estimating various properties like time for total sublimation, concentration gradient, and energy usage are vital for process characterization and optimization. A diffusion-based mathematical model has been proposed and experimentally verified to sublimate the ice patterns in this research. Experimental results show a close correlation (96.74%) with the theoretical model. The demonstration of ice investment casting has been carried out, and it reported close dimensional accuracy.
COVID Key: A Multifunctional Device to Avoid Touch
01 Feb 2021 to 01 Jul 2021 Link
COVID-19 is a global pandemic caused by the novel coronavirus. Although the surfaces pose a low risk of transmission, it is beneficial to use a handheld key-like device to avoid touching the surfaces, especially in public places. The present article reveals a novel design for a multifunctional handheld device, termed the COVID key. The proposed COVID key exhibits ten distinct features, viz. doorknob opener, pushing, pulling, forceps action, sharp edge, key chain, smartphone stand, and a linear and angular scale frequently used in daily life. Theoretical and computational analyses are carried out to check the validity of the design under different loading conditions resembling everyday use. Topological optimization is carried out to achieve the best stiffness-to-weight ratio. The final design is 3D printed in two different materials, ABS (acrylonitrile–butadiene–styrene) and PLA (poly-lactic-acid), using fused deposition based additive manufacturing. Testing and validation of the design are carried out with everyday actions. The COVID keys are distributed among a group of ten unbiased users. The user satisfaction score is recorded based on six basic metrics, viz. ease of use, size, strength, appearance, material and ease of carrying. A satisfaction score of 85% is reported, with ABS being the preferred material of choice.
Multi-Axis Hybrid Layer Manufacturing of Plastics (MA-HLM-P)
3D printing, aka Additive Manufacturing (AM) is a non-conventional manufacturing technique that enables physical realization of a given CAD model. Out from this newly formed technology (~34 years), various sub-domains have been emerged and developed. Considered to be one of the most widely used, Fused Filament Fabrication (FFF), also called, Fused Deposition Modeling (FDM), is a Solid-Freeform-Fabrication (SFF) process that uses selective deposition of a melted thermoplastic wire to get the solid geometry. Even this versatile technique suffers from 4 primary bottlenecks of poor strength, heavy cost, high print time and poor finish, that limit its usage for prototyping purposes only. To counter these bottlenecks, MA-HLM-P is proposed by us, at Rapid Manufacturing (RM)Lab, IIT Bombay. MA-HLM-P is a state-of-the-art, hybrid printing process that enables multi-axis deposition and subtraction, using a grain based screw extruder and a coaxially placed high speed cutter, respectively, to counter the current hurdles of RP, in order to convert it into RM.
Activities & Interests

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