Title: Investigation of Process Variation Effects Via a Homogeneous 3-Dimensional Tensile Test Coupon in Polyjet 3D Additive Printing

Authors: Ravi Pratap Singh. Tomar, Furkan I. Ulu, Dr. Ram V. Mohan, and Dr. Ajit kelkar

DOI: 10.33599/nasampe/s.19.1546

Abstract: PolyJet printing technology is one of few additive manufacturing (AM) techniques capable of making the monolithic, multi-material structure. This paper investigates the Polyjet process variation effects that leads to differences in properties based on how it is built by designing a homogenized 3-dimensional tensile test coupon. Traditional ASTM D638 tensile test coupon’s limitation is that one direction is thinner than the other two directions, which may not account for non-uniformity in material deposition in all three directions during printing. Firstly, these test coupons do not represent the real-world material behavior, and secondly, the effect of normal strain, which is a compressive strain in thinner directions, is not effectively captured. To avoid these limitations of the traditional specimen, a homogeneous 3-dimensional tensile test configuration is designed to keep the same cross-section’s aspect ratio to form uniform material deposition. Results from tensile behavior of both traditional and homogeneous 3-Dimensional specimen are discussed. Study findings provide insight on the limitation of traditional test coupon and careful evaluations of process variation effect in Polyjet printing. The fracture surface of both PolyJet printed failed specimen are also examined to provide insight into failure characteristic. Findings aid in further understanding the process dependent properties capturing three-dimensional effects of Polyjet printing process.

References: [1] B. Berman, “3-D printing: The new industrial revolution,” Bus. Horiz., vol. 55, no. 2, pp. 155–162, 2012. [2] M. W. Barclift and C. B. Williams, “Examining Variability in the Mechanical Properties of Parts Manufactured Via Polyjet Direct 3D Printing,” Int. Solid Free. Fabr. Symp., pp. 876–890, 2012. [3] L. Bass, N. A. Meisel, and C. B. Williams, “Exploring variability of orientation and aging effects in material properties of multi-material jetting parts,” Rapid Prototyp. J., vol. 22, no. 5, pp. 826–834, 2016. [4] A. Kęsy and J. Kotliński, “Mechanical properties of parts produced by using polymer jetting technology,” Arch. Civ. Mech. Eng., vol. 10, no. 3, pp. 37–50, 2010. [5] J. T. Cantrell et al., “Experimental characterization of the mechanical properties of 3D-printed ABS and polycarbonate parts,” Rapid Prototyp. J., vol. 23, no. 4, pp. 811–824, 2017. [6] R. P. S. TOMAR, M. GHAZIZADEH, E. H. MARTIN, and A. D. KELKAR, “Low Velocity Impact Response of Bio-inspired Fiberglass Woven Composites,” in American Society of Composites-30th Technical Conference, 2015. [7] Ulu, F.I., Tomar, R.P.S., Mohan, R.V. “Investigation of Digital Computer Aided Design Assembly and Tessellation Effects on Digital ABS Part Quality in PolyJet-3D Additive Printing.” SAMPE Technical Conference Proceedings Long Beach, CA, May 21-24, 2018. Society for the Advancement of Material and Process Engineering. [8] S. R. Karnati, “A mixed-mode (I-II) fracture criterion for AS4/8552 carbon/epoxy composite laminate.” North Carolina Agricultural and Technical State University, 2014. [9] E. Ulu, E. Korkmaz, K. Yay, O. B. Ozdoganlar, and L. B. Kara, “Enhancing the structural performance of additively manufactured objects through build orientation optimization,” J. Mech. Des., vol. 137, no. 11, p. 111410, 2015. [10] N. Meisel and C. Williams, “An Investigation of Key Design for Additive Manufacturing Constraints in Multimaterial Three-Dimensional Printing,” J. Mech. Des., vol. 137, no. 11, p. 111406, 2015.

Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1546

Pages: 11

Price: FREE