Abstract
Abstract Additive manufacturing processes have been developed over the last decades, especially vat photopolymerization (VP) processes, due to its simplicity and speed. The objective of this paper is to characterize commercial VP resins widely used for technical applications. Thus, test specimens were printed by Digital Light Processing and subjected to tensile, compression, flexural, hardness, and inorganic composition analyses. The resin with the highest resistance and hardness (containing 0.6 vol% of inorganics load) reached 53 MPa in tension, 110 MPa in compression, 79 MPa in bending, and 82.3 Shore D, which is comparable to injected polymers. A case study was made, replacing the injected gears of a reducer by printed ones and comparing the finite element analysis with resin properties. The characterization and case study results encourage the expansion of VP processes in the manufacturing of products in several industries and service sectors, as well as the development of new composite resins.
Highlights
Research has driven huge advances in additive manufacturing (AM) in recent decades
According to ISO/ASTM 52900:20157:3, vat photopolymerization (VP) is defined as an “[...] additive manufacturing process in which liquid photopolymer in a vat is selectively cured by light-activated polymerization.”
Vat photopolymerization is characterized by having the best combination of resolution and surface quality among additive manufacturing processes[11,27]
Summary
AM currently allows the manufacture of products in various materials (polymers, metals, ceramics, and composites) and geometries that would be unfeasible or even impossible to manufacture by other processes[1,2,3]. The studies of Kodama[4] and André et al.[5] are important examples of additive manufacturing precursors that employ light-curable resins. According to ISO/ASTM 52900:20157:3, vat photopolymerization (VP) is defined as an “[...] additive manufacturing process in which liquid photopolymer in a vat is selectively cured by light-activated polymerization.”. By using liquid raw material, VP enables micrometric layer manufacturing or even layerless continuous manufacturing[8]. The light patterns applied on the resin are based on a three‐dimensional computational drawing of the part, solidifying the layers and creating an object similar to the precursor drawing. VP is commonly divided in the literature into three types: vector scan
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