Prediction of the properties of photopolymer prototypes

Abstract

The study of the mechanical properties of photopolymer material SI500. For the manufacture of experimental samples used the method of rapid prototyping stereolithography. The effect of process parameters on tensile and compression strength was studied. It was found that the mechanical strength of the samples is influenced by the layer thickness, exposure time, and additional processing in an ultraviolet chamber. The values of maximum tensile stresses, which are achieved when the layer is exposed for 30 seconds and additional processing, are determined. Changing the layer thickness does not significantly affect the values of maximum tensile stresses. The maximum is in the range from 53.4 MPa to 55.4 MPa. Values of maximum mechanical strength during compression of the samples is achieved with a flash of 10 seconds. The maximum compressive stresses range from 229 MPa to 230 MPa. Changing the layer thickness does not significantly affect the compressive strength.

Response surface method for optimisation of SLA processing parameters

“…See Figure 5(b). These results could confirm earlier results reported by Shumkov et al (2020), who suggested an increase in the exposure time (related to the rise in hatch overcure), improved photopolymer material density SI500 and higher mechanical properties were obtained. In addition, it was shown that the UTS of an SLA part could be increased by either increasing the hatch overcure and/or reducing the layer thickness.…”

“…In a recent study by Seprianto et al (2020), it was concluded that the layer thickness and exposure time (the duration at which the resin is exposed under the light source for each layer) were the most significant factors affecting the impact strength of SLA components. Similar conclusions were reported by Shumkov et al (2020) about the effect of layer thickness and exposure time on the tensile and compressive properties of photopolymer material SI500. Lee et al (2021) also studied the effect of layer thickness on the dimensional accuracy, and the results were in line with Jacob's findings.…”

“…These parameters were determined to significantly affect the density, mechanical properties, surface finish, and dimensional accuracy of the fabricated part. Therefore, it is essential to understand how these parameters affect the part properties to achieve a better quality of parts produced by this process (Cotabarren et al, 2019;Karumuri et al, 2021;Kunjan, 2017;Mele et al, 2019;Piedra-Cascón et al, 2021;Seprianto et al, 2020;Shumkov et al, 2020).…”