Experimental Investigation of Mechanical Performance and Printability of Gamma-Irradiated Additively Manufactured ABS
- PDF / 5,988,226 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 15 Downloads / 217 Views
ASM International 1059-9495/$19.00
Experimental Investigation of Mechanical Performance and Printability of Gamma-Irradiated Additively Manufactured ABS Behzad Rankouhi, Sina Javadpour, Fereidoon Delfanian, Robert McTaggart, and Todd Letcher (Submitted October 5, 2017; in revised form January 30, 2018) The work presented in this paper investigates the effects of gamma radiation on ABS in forms of irradiated 3D-printed parts, and irradiated filament used to later 3D-printed parts, using a cobalt-60 gamma irradiator. Tensile and flexural test samples were fabricated using off-the-shelf FDM 3D printers and irradiated at different dosages. Mechanical properties including elastic and flexure moduli, ultimate and flexural strength, % elongation at break, and surface hardness were evaluated, and results were compared to a control group. Evidence of cross-linking and chain scission and signs of possible oxidation of polymer caused by irradiation were found in both test groups which led to changes in mechanical properties. Moreover, it was found that ABS filament retains its printability after absorbing 15 kGy of gamma radiation and that its mechanical performance is very similar to those of irradiated samples at the same dose. Obtained results show promise for using ABS to fabricate sterile surgical instruments. Keywords
3D printing, ABS polymer, fused deposition modeling, gamma irradiation, mechanical properties, sterilization, surgical instruments
1. Introduction 1.1 Additive Manufacturing Previously, the term ‘‘rapid prototyping’’ was used to describe any technology that creates physical objects directly from digital models to be used as prototypes. Now, the technology is used for many more purposes including end-use manufacturing, and therefore, the term rapid prototyping is no longer an adequate description. Additive manufacturing (AM) is the newly adopted term by ASTM international to replace the term rapid prototyping (Ref 1). Today, AM is best defined as the ‘‘process of joining materials to make objects from threedimensional (3D) model data, usually layer upon layer, as opposed to subtractive manufacturing technologies’’ (Ref 2). AM technologies are divided into eight major categories: vat photopolymerization, powder bed fusion systems, extrusionbased systems, material jetting, binder jetting, sheet lamination, direct energy deposition and direct write technologies. AM is maturing as a novel manufacturing solution to a number of long-lasting engineering problems including but not limited to fully customizable orthotics (Ref 3, 4), manufacturing lightweight structures for automotive and aerospace industries (Ref 3, 5), micro- and nanomanufacturing (Ref 6, 7), and in-space manufacturing (Ref 8-12).
Behzad Rankouhi, Sina Javadpour, Fereidoon Delfanian, and Todd Letcher, Department of Mechanical Engineering, South Dakota State University, Brookings, SD 57007; and Robert McTaggart, Department of Physics, South Dakota State University, Brookings, SD 57007. Contact e-mail: [email protected].
Journal of Materials E
Data Loading...
