Abstract
To optimize the mechanical performance of fused deposition modelling (FDM) fabricated parts, it is necessary to evaluate the influence of process parameters on the resulting mechanical performance. The main focus of the study was to characterize the influence of the initial process parameters on the mechanical performance of thermoplastic polyurethane under a quasi-static and high strain rate (~2500 s−1). The effects of infill percentage, layer height, and raster orientation on the mechanical properties of an FDM-fabricated part were evaluated. At a quasi-static rate of loading, layer height was found to be the most significant factor (36.5% enhancement in tensile strength). As the layer height of the sample increased from 0.1 to 0.4 mm, the resulting tensile strength sample was decreased by 36.5%. At a high-strain rate of loading, infill percentage was found to be the most critical factor influencing the mechanical strength of the sample (12.4% enhancement of compressive strength at 100% as compared to 80% infill). Furthermore, statistical analysis revealed the presence of significant interactions between the input parameters. Finally, using an artificial neural networking approach, we evaluated a regression model that related the process parameters (input factors) to the resulting strength of the samples.
Highlights
Additive manufacturing (AM), or 3D printing, has transformed various industries, from fabricating custom prototypes to large-scale manufacturing of final products
We investigated the effect of 3D printing process parameters on the mechanical tensile strength of thermoplastic polyurethane (TPU) samples under both quasi-static conditions and maximum compressive strength at a high strain rate (2500 s–1)
This included analyzing how infill percentage, layer height, and raster angle affected the mechanical properties of the TPU samples and the interactions between these factors
Summary
Additive manufacturing (AM), or 3D printing, has transformed various industries, from fabricating custom prototypes to large-scale manufacturing of final products. The continuous development of novel 3D printing techniques and materials is set to revolutionize the way most products are manufactured [1] This technology offers solutions with a high degree of flexibility and customization in design, top-notch precision, excellent reproducibility, and rapid microfabrication. FDM (3D printing technology as defined by ISO/ASTM 52900), is a process whereby a thermoplastic material is extruded in layers to create a 3D object. In this process, the design of the product is first realized using computer-aided design (CAD) software. The design is exported to the STL tessellated file format This faceted model is sliced into parallel horizontal cross-sections.
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