Experimental and computational analysis of mechanical properties of RGD840 material manufactured through PolyJet process

• Published in: Rapid prototyping journal Vol. 27; no. 1; pp. 207 - 214
• Main Authors: Maurya, Nagendra Kumar, Rastogi, Vikas, Singh, Pushpendra
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Publishing Limited 08.01.2021; Emerald Group Publishing Limited
• Subjects: Accuracy; Biomedical engineering; Biomedical materials; Elongation; Finite element method; Fracture surfaces; Graphical methods; Manufacturing; Mathematical analysis; Mathematical models; Mechanical properties; Modulus of elasticity; Orientation; Plastic deformation; Process parameters; Rapid prototyping; Raster; Shear strength; Strain analysis; Strain hardening; Surface finish; Tensile strength; Tensile tests; True strain; True stress; Ultimate tensile strength; Elastic modulus; Rapid prototyping; Tensile strength; Plastic strain; PolyJet process
• ISSN: 1355-2546; 1758-7670
• DOI: 10.1108/RPJ-03-2020-0049

Purpose Nowadays, the PolyJet technique is used to fabricate low volume functional parts in engineering and biomedical applications. However, the mechanical properties of the components fabricated through this process are inferior in comparison to components fabricated through the traditional manufacturing process. This paper aims to attempt to investigate the influence of process parameters, i.e. raster angle, orientation and type of surface finish on mechanical properties of RGD840 material manufactured by the PolyJet process. Design/methodology/approach Initially, this study focuses on experimental evaluation of elastic modulus, ultimate tensile strength and percentage elongation of the material. Further detailed experimental study of true stress, true strain, and plastic strain are conducted. Computational analysis of plastic strain is performed by using finite element analysis (FEA) software ABAQUS. The value of strength coefficient (K) and strain hardening coefficient (n) is calculated by using the graphical method from the true stress-plastic strain curve. Findings It is observed that 90º raster angle, flat orientation and glossy surface are the best level of process parameters for the tensile strength, true stress and modules of elasticity of the RGD840 material and the obtained value are 27.88, 30.134 and 2891.5 MPa, respectively. The percentage elongation is maximum at 60º raster angle, flat orientation, and matte finish type and the obtained value is 23.38%. The optimum level of process parameters are 90° raster angle, Flat orientation, with Glossy surface finish. SEM analysis of the fracture surface of the tensile test specimen proves that the fracture surface is brittle in nature. Originality/value The novelty of this work lies in the fact that no attempts were made to investigate the computational investigation of mechanical properties of RGD840 material.