Mechanical Engineering

D. Rajamani This email address is being protected from spambots. You need JavaScript enabled to view it.1 and E. Balasubramanian1

1Centre for Autonomous System Research, Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai - 600062, India

 

Received: January 14, 2019
Accepted: May 16, 2019
Publication Date: September 1, 2019

Download Citation: ||https://doi.org/10.6180/jase.201909_22(3).0001  

ABSTRACT

Selective heat sintering (SHS) process aims to produce near net shape components through sintering of specific region of powder particles. Evaluation of viscoelastic properties of SHS parts are of major importance to produce functional parts for diverse applications. The present study focuses on investigation of SHS governing parameters on loss modulus, storage modulus and damping factor of high density polyethylene (HDPE) specimens. SHS system is custom built and experiments are conducted based on four factors three level box-behnken design. The interaction among SHS process variables for examining the viscoelastic properties using response surface analysis is performed. Optimal SHS process variables are obtained using non-desirability statistical approach. Morphological examinations are conducted using scanning electron microscope (SEM) where in pull outs, voids and pores are observed in the sintered surfaces. The results revealed that at high heater energy (26.32 J/mm2) and low layer thickness (0.1 mm) with high heater feedrate (3.5 mm/sec) and printer feedrate (116.38 mm/min) is beneficial for improving viscoelastic properties of sintered specimens. These analyses provided an insightfor the fabrication of near netshape components with sufficientviscoelastic properties.


Keywords: Additive Manufacturing, Sintering, Optimization, Desirability, Viscoelastic Properties


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