Abstract:The additive manufacturing (AM) technology provides a unique opportunity to realize as-built assemblies, i.e., assemblies which can be fabricated as a whole in one build cycle. Some of the introduced challenges, however, are the design issues of these assembly structures and understanding the dimensional performance of the AM process to ensure proper mobility. While process improvement techniques have been proposed for dealing with individual additive components, it is also necessary to study the dimensional b… Show more
“…Lower limb prosthesis has increased globally, making it more difficult for patients to recover movement and independence. Table 5 summarizes the recent fabrications utilizing polyjet technology, and Table 6 enlists various multi-material additive manufacturing using the photopolymer jetting method 12,13,144,148 and the material extrusion method. [14][15][16]…”
Section: Industrial Applications Of Polyjet Additively Manufacturedmentioning
confidence: 99%
“…Also, there are no criteria for the quality control given on the raw polymeric material before printing. In addition, the absence of standardization for a variety of melt characteristics, such as melt viscosity or melt index, for extrusion processes such as polyjet AM results largely in anisotropic characteristics in printed specimens.Figure 12.3D printed sample under (a) tensile test, (b) compression test for polyjet AM lattice, 144 (c) three-point flexural test, 145 and (d) compression test for multi-material AM structure. 145 …”
Section: D Printing and Testing Standardsmentioning
confidence: 99%
“…3D printed sample under (a) tensile test, (b) compression test for polyjet AM lattice, 144 (c) three-point flexural test, 145 and (d) compression test for multi-material AM structure. 145 …”
Section: D Printing and Testing Standardsmentioning
This article investigates the state-of-the-art of polyjet 3D printing of polymers and multi-material structures, with an emphasis on its applications in a range of industrial domains, including aerospace, architecture, toy fabrication, and medical field. While significant research and development in the field of additively manufactured (AM) multi-material and reinforced composite structures have been carried out during the previous decade, the need of the hour is to utilize a single manufacturing platform which would not only help to govern the composition, shape, and characteristics of multi-material 3D printed objects at the microscopic level but would also help industries to replace the conventional AM manufacturing methods and optimize their mechanical performance. Significant advancements in polyjet 3D printing of fiber-reinforced and functionally graded structures with numerous modifications in material composition are reviewed, which may revolutionize the industrial sector. Numerous polyjet printing parameters such as accuracy, printing speed, photo-curing effect, build orientation, layer thickness, print angles, and post-processing are comprehensively discussed, and best outputs to optimize the mechanical performance and enhance the accuracy of the polyjet 3D printing products are highlighted. FEA (finite element analysis) models and analytical relations for multi-material 3D printed structures are presented to predict and enhance the overall performance of polyjet fabrication. Along with the benefits of polyjet manufacturing, a few of the limitations and challenges of polyjet AM are addressed which would benefit the reader to conduct further research in this field and enhance fabrication quality significantly. Vivid comparisons with other multi-material AM fabrication techniques such as FDM, SLA, and SLS with their brief discussion, merits, and demerits are done.
“…Lower limb prosthesis has increased globally, making it more difficult for patients to recover movement and independence. Table 5 summarizes the recent fabrications utilizing polyjet technology, and Table 6 enlists various multi-material additive manufacturing using the photopolymer jetting method 12,13,144,148 and the material extrusion method. [14][15][16]…”
Section: Industrial Applications Of Polyjet Additively Manufacturedmentioning
confidence: 99%
“…Also, there are no criteria for the quality control given on the raw polymeric material before printing. In addition, the absence of standardization for a variety of melt characteristics, such as melt viscosity or melt index, for extrusion processes such as polyjet AM results largely in anisotropic characteristics in printed specimens.Figure 12.3D printed sample under (a) tensile test, (b) compression test for polyjet AM lattice, 144 (c) three-point flexural test, 145 and (d) compression test for multi-material AM structure. 145 …”
Section: D Printing and Testing Standardsmentioning
confidence: 99%
“…3D printed sample under (a) tensile test, (b) compression test for polyjet AM lattice, 144 (c) three-point flexural test, 145 and (d) compression test for multi-material AM structure. 145 …”
Section: D Printing and Testing Standardsmentioning
This article investigates the state-of-the-art of polyjet 3D printing of polymers and multi-material structures, with an emphasis on its applications in a range of industrial domains, including aerospace, architecture, toy fabrication, and medical field. While significant research and development in the field of additively manufactured (AM) multi-material and reinforced composite structures have been carried out during the previous decade, the need of the hour is to utilize a single manufacturing platform which would not only help to govern the composition, shape, and characteristics of multi-material 3D printed objects at the microscopic level but would also help industries to replace the conventional AM manufacturing methods and optimize their mechanical performance. Significant advancements in polyjet 3D printing of fiber-reinforced and functionally graded structures with numerous modifications in material composition are reviewed, which may revolutionize the industrial sector. Numerous polyjet printing parameters such as accuracy, printing speed, photo-curing effect, build orientation, layer thickness, print angles, and post-processing are comprehensively discussed, and best outputs to optimize the mechanical performance and enhance the accuracy of the polyjet 3D printing products are highlighted. FEA (finite element analysis) models and analytical relations for multi-material 3D printed structures are presented to predict and enhance the overall performance of polyjet fabrication. Along with the benefits of polyjet manufacturing, a few of the limitations and challenges of polyjet AM are addressed which would benefit the reader to conduct further research in this field and enhance fabrication quality significantly. Vivid comparisons with other multi-material AM fabrication techniques such as FDM, SLA, and SLS with their brief discussion, merits, and demerits are done.
“…They found that build orientation has a very high impact on these measurements, but the results were not fully consistent with each other [ 32 ]. Haghighi et al stated that a horizontal build resulted in better dimensional accuracy than vertical builds [ 44 ]. Kitsakis et al investigated the tolerance values in the X, Y and Z direction of MJ printed parts.…”
Material jetting (MJ) technology is an additive manufacturing method that selectively cures liquid photopolymer to build functional parts. The use of MJ technology has increased in popularity and been adapted by different industries, ranging from biomedicine and dentistry to manufacturing and aviation, thanks to its advantages in printing parts with high dimensional accuracy and low surface roughness. To better understand the MJ technology, it is essential to address the capabilities, applications and the usage areas of MJ. Additionally, the comparison of MJ with alternative methods and its limitations need to be explained. Moreover, the parameters influencing the dimensional accuracy and mechanical properties of MJ printed parts should be stated. This paper aims to review these critical aspects of MJ manufacturing altogether to provide an overall insight into the state of the art of MJ.
“…In addition to the above quality properties, dimensional accuracy and precision are identified as key factors for dimensional quality assessment (Kruth et al , 1998) as they define the degree of tightness or looseness between components in assemblies and can directly affect their functionality (Haghighi et al ., 2017). For the purpose of this paper, it is important to separate and provide a clear definition of these quality characteristics and the related terminology (Dimitrov et al , 2006), as they have sometimes been used interchangeably in the literature: Dimensional accuracy is evaluated by the amount by which the expected value of a set of dimensions is away from the nominal dimension (i.e.…”
Purpose
Quantifying and controlling the quality characteristics of parts produced by additive manufacturing (AM) processes has attracted significant interest in the research community. However, to increase the sustainability of AM processes, such quality characteristics need to be assessed together with life cycle performance of AM processes such as energy and material consumption and manufacturing cost. Although a few studies have been performed for several quality characteristics, i.e. surface roughness and tensile strength, the relationship between dimensional performance and manufacturing cost is still not well known for AM processes.
Design/methodology/approach
In this paper, a comprehensive study of the dimensional performance and manufacturing cost of fused deposition modeling AM process is performed. Design of experiment technique is used, and the correlation of different cost components and the dimensional accuracy of parts are statistically studied.
Findings
The optimum process parameters for simultaneously optimizing the dimensional performance and manufacturing cost are identified. The analysis shows that as opposed to traditional manufacturing processes, obtaining a better dimensional performance is not necessarily associated with higher cost in the AM processes.
Originality/value
Almost no study and analysis for the combined dimensional performance and manufacturing cost has been performed for AM processes in the literature. It is known that within the context of traditional manufacturing processes, a natural trade-off governs the pursuit of higher dimensional performance and the manufacturing cost. However, as the AM process has a different nature compared with traditional manufacturing processes, the relationship between manufacturing cost and dimensional performance of parts has to be studied. Understanding this relationship will also help to establish a cost-optimal and sustainable tolerance allocation strategy in assemblies with AM components.
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