International Journal of Research in Engineering, Science and Management Volume-1, Issue-10, October-2018 www.ijresm.com | ISSN (Online): 2581-5782 332 Abstract—This study is mainly focussed to fully understand the mechanical properties and characteristics of the parts manufactured using additive manufacturing. It is very important to understand the mechanical properties of products manufactured through various additive manufacturing processes like Stereolithography (SLA), Selective Laser Sintering (SLS), and Fused Deposition Modeling (FDM) and Polyjet. In this project the mechanical properties such as Dimensional Accuracy, Tensile property and Shore Hardness of components manufactured by various additive manufacturing techniques as per ASTM D638-10 type iv standard are evaluated. Each additive manufacturing process and its process parameters are studied in detail along with comparison of mechanical properties of the final components. Index Terms—Additive Manufacturing, ASTM D638-10 type iv standard, Dimensional Accuracy, FDM, Polyjet, SLA, SLS, Tensile property, Shore Hardness. I. INTRODUCTION The Additive Manufacturing equipment reads in data from the CAD file and lays downs or adds successive layers of liquid, powder, sheet material or other, in a layer-upon-layer fashion to produce a 3D object, unlike conventional methods, where material is removed to obtain the final object. In this project, the experimental evaluation of mechanical properties such as dimensional accuracy, tensile property and shore hardness on Selective Laser Sintering (SLS), PolyJet, Fused Deposition Modelling (FDM), and Stereolithography (SLA) will be discussed in detail. A set of specimen of three build orientations (horizontal, side, vertical) on each of these additive manufacturing processes according to ASTM D638-10 type iv standards. II. LITERATURE SURVEY It is difficult to directly compare the many properties of rapid prototyping parts, as these depend not only on the material being used, but also on the direction in which the property is being measured. In this study, the properties: 1) dimensional accuracy, 2) tensile property, 3) Shore hardness were investigated. According to the previous work and literature source related to these topics, it is observed that the dimensional accuracy of an additive manufacturing product is influenced by a specific rapid prototyping technique used, the material chosen, and the operating parameter values. Due to different processes and materials used in rapid prototyping technologies, parts differ in their tendency to shrink or deform. The accuracy data in this paper was obtained from technical publications and from company literature. There was no comparative information available for different build orientations. It is observed that the shrinkage of the Stereolithography (SLA) epoxy was significantly less than the Selective laser sintering (SLS) plastic material, and the small shrinkage of Stereolithography (SLA) resins was simple to predict and easy to control. It is observed that the choice of deposition strategy plays an important role in the Fused Deposition Modelling (FDM). Different deposition strategies may cause different performance in mechanical properties. III. METHODOLOGY The investigations of dimensional accuracy and tensile properties testing for three build orientations are provided in this paper. Furthermore, Shore hardness for these samples are also available in this study. A. Materials and Sample Preparation The Table-1, shows the materials and the machine settings that were used in the specified additive manufacturing methods. The materials that were used in this research were the most popular in the current commercial marketplace. The machine settings were also listed in Table I. The test specimens were fabricated by these four additive manufacturing processes in three build orientations as shown in Table I, and the dimensions conformed to ASTM D638-10 Type IV. Comparative Study on Mechanical Properties of Various Additive Manufacturing Methods K. Shilpa 1 , D. V. Paleshwar 2 , Sainath Kasuba 3 1 Student, Department of Mechanical Engineering, Sreyas Inst. of Engineering & Technology, Hyderabad, India 2 Asst. Prof., Department of Mechanical Engineering, Sreyas Inst. of Engg. & Tech., Hyderabad, India 2 Assoc. Prof., Department of Mechanical Engineering, Sreyas Inst. of Engg. & Tech., Hyderabad, India TABLE I MATERIAL AND MACHINE SETTING System Material Machine Setting SLS PA 3200 (polyamide 12) Default Standard calibration for PA3200 Z-Axis = 0.100 mm Polyjet Tango Black Default Print mode = High Quality Z-Axis = 0.016 mm FDM ABS plastic Default Model interior fill = Sparse - High density Support Fill = Sparse Z-Axis = 0.01 inch (0.254 mm) SLA ACCURA 60 Default Print mode= Z-Axis = 0.01 inch (0.254 mm)