Process parameter optimization of viscoelastic properties of FDM manufactured parts using response surface methodology

The main aim of this study is to optimize the FDM process parameters for better dynamic mechanical properties and part structure. The FDM process parameters considered in this study includes layer thickness, air gap, raster angle, build orientation, road width and number of contours. The measured response includes complex modulus and dynamic viscosity. The IV-optimal design has been used as the experimental strategy whereas the process optimization has been done through desirability function. The structure of the manufactured parts was studied and characterized using Scanning electron microscope (SEM). The results show that layer thickness, air gap and number of contours are the important parameters that influence the complex modulus and dynamic viscosity. The optimal condition was found to be layer thickness of 0.3302 mm, air gap of 0.0 mm, raster angle of 0°, build orientation of 90°, road width of 0.4572 mm and 10 contours.