Investigation of shrinkage-induced stresses in stereolithography photo-curable resins |
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Authors: | D Karalekas D Rapti E E Gdoutos A Aggelopoulos |
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Institution: | (1) University of Pireaus, GR-185 34 Pireaus, Greece;(2) Democritus University of Thrace, GR-671 00 Xanthi, Greece |
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Abstract: | An experimental study has been undertaken to investigate the shrinkage characteristics of acrylic-based and epoxy-based stereolithography
(SL) photopolymer resin systems after they have been laser cured and post-cured under ultraviolet (UV), and thermal exposure.
The induced residual stresses and strains were determined by the shadow moiré and the hole-drilling strain-gage methods. Out-of-plane
displacements (warpage) of acrylic-based post-cured resin plates were recorded by means of the shadow moiré method and correlated
to the shrinkage strains by theoretical analysis. The induced residual stresses in the epoxy-based cylindrical resin specimens
were determined from strains of three-element strain-gage rosettes of the blind-hole drilling method. Results are presented
for the shrinkage stresses and strains for both material systems as a function of the post-curing process (UV, thermal). It
was found that the shrinkage strains in the acrylic-based photopolymer resin were of considerable magnitude, while thermal
post-curing resulted in higher shrinkage stresses for both material systems. The values of the shrinkage stresses compare
well with those of the existing literature. |
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Keywords: | Residual stresses strains photopolymer resins shadow moiré ultraviolet exposure hole-drilling method curing post-curing sterolithography |
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