GRD Journals- Global Research and Development Journal for Engineering | Volume 4 | Issue 9 | August 2019 ISSN: 2455-5703
A Study on the Effect of Infill Percentage and Infill Pattern on the Compressive Behaviour of the FDM Printed Polylactic Acid (PLA) Polymer Anas Mirza Baig M. Tech student Department of Mechanical Engineering Integral University, Lucknow, U. P. (India) Dr. K. M. Moeed Associate Professor Department of Mechanical Engineering Integral University, Lucknow, U. P. (India)
Md. Shakibul Haque Sr. Lecturer Department of Mechanical Engineering Integral University, Lucknow, U. P. (India)
Abstract Fused deposition modelling (FDM) is chiefly using polylactic acid (PLA) as material of choice. PLA can be used to print a var iety of components like medical implants, domestic products & mechanical parts etc. The variation in infill pattern as well as infill percentage impacts the mechanical behaviour of the printed part. In the present study FDM printed PLA specimens subjected to compressive tests in order to observe their behaviour under compressive forc es. Keywords- Fused Deposition Modelling (FDM), Polylactic Acid (PLA), Infill Percentage, Infill Pattern, Compressive Strength
I. INTRODUCTION One of the biggest advantage of the 3D printing technology is that the components with different infill geometries and infill patterns can be printed. This not only saves material but also reduces the overall component cost. 3D printing process has been succes sfully utilized in comparative study of biostructure [12], scaffold structures [14], micro-fabrication [6] and light weight UAV (unmanned aerial vehicles) [11] and design of police whistles [13]. This process is also used for studying the compressive and tensile behaviour of Natural Sand Stone [8]. Many prior study has suggested that this process can be used to print a wide variety of polymers [15] and composites [7] even multi-nozzle extrusion printing is also possible [16], [4]. This process is also capable of printing density variables parts [17], with different type of infill generation [18]. Literature survey of prior investigation reveals that there is a significant effect of printing orientation, density, and filler pattern [19], layer thickness and raster angle [1], [20], [5] , [6] on mechanical performance of part like compressive performance [19], fatigue performance [21] , surface roughness tensile streng th [3], [9] and maximum flexure properties [2], [22]. The study has also shown that this process can also be integrated with design and manufacturing data [12].
II. WORK METHODOLOGY A. Test Specimens Test specimens were printed using FDM technology. The cross section of the specimen used was 12.7 mm Ă— 12.7 mm with a length of 25.4 mm. The specimens were printed with three different infill patterns i.e. hexagonal, triangular, and linear and three different infill percentages i.e. 25%, 50%, and 100%. The general values for the material properties are following: PROPERTY Bulk Density (g/cm3) Infill (%) Shell Thickness Layer Thickness Printing method Printer Printing firm Infill Pattern Colour Extruder temperature Bed Temperature
VALUE 1.24 g/cm3 25% , 50% , 100% 0.3 mm 0.3 mm FDM Flash Forge Guider II INTEGRAL UNIVERSITY Hexagonal, linear and triangular Red 220 o C 65 o C
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