Experimental and Theoretical Analysis on the Dynamic Characteristics of Fused Filament Fabrication Plates

Shijie Jiang,Weibing Dai,Mingyu Sun,Chunyu Zhao,Ming Zhan

doi:10.1155/2019/1219435

Abstract

With the increasingly wide application of fused filament fabrication (FFF) technique, the built products are inevitably exposed to dynamic mechanical loading and vibration. However, there has been no systematic study in the literature on understanding and characterization of dynamic mechanical performance for FFF products. In this paper, the dynamic characteristics of FFF plates are quantified, with the effect of different extrusion width taken into account. A dynamic model of the built plate with cantilever boundary conditions is established, and the inherent characteristics are predicted. Modal tests are then performed on these samples to obtain the measured data. Through the comparison between predictions and measurements, the theoretical model is validated. Different extrusion width makes the material properties of the plates different, resulting in different dynamic characteristics. The scanning electron microscopy (SEM) analysis on the samples confirms that the dynamic characteristic is deteriorated as the extrusion width decreases. This present work provides theoretical basis and technical support for further research in improving the dynamic performance of FFF products and helps extend the applications of this technique.

Highlights

Fused filament fabrication (FFF), an extrusion-based additive manufacturing technique, is able to fabricate products almost without geometrical limitations [1, 2]
It can be seen that the wider the extrusion width is, the larger the material property of the corresponding samples will be. is can be explained that when the extrusion width increases, the bonding area between adjacent extruded filaments is increased, leading to the improvement of bonding strength. ere would be fewer thermal cycles and nonuniform thermal gradients, leading to fewer distortions and deformations of the extruded filament, and better bonding quality
This paper studied the inherent characteristic of FFF plates under cantilever boundary conditions and quantified the effect of extrusion width

Summary

Introduction

Fused filament fabrication (FFF), an extrusion-based additive manufacturing technique, is able to fabricate products almost without geometrical limitations [1, 2]. In this procedure, the raw material filament is first melted in an extrusion head. Erefore, the analysis in terms of dynamic characteristic of FFF products is needed to accurately determine the reliability. Mohamed et al [17, 18] used the same test method to investigate different processing parameters’ effect on the dynamic elastic modulus of samples and pointed out that modulus values would decrease when the build orientation, raster angle, or air gap increased. The numerical values of maximum glass transition temperature and dynamic modulus were determined by optimizing the processing parameters

Methods

Results

Conclusion