Dynamic and quasi-static characterization and Cowper–Symonds material model calibration of photopolymer resins produced by stereolithography

Authors

  • Tomáš Doktor Czech Technical University in Prague, Faculty of Transportation Sciences, Prague, Czechia
  • Veronika Drechslerová Czech Technical University in Prague, Faculty of Transportation Sciences, Prague, Czechia
  • Jan Falta Czech Technical University in Prague, Faculty of Transportation Sciences, Prague, Czechia
  • Tomáš Fíla Czech Technical University in Prague, Faculty of Transportation Sciences, Prague, Czechia
  • Václav Rada Czech Academy of Sciences, Institute of Theoretical and Applied Mechanics, Prague, Czechia
  • Bohumil Hora Czech Technical University in Prague, Faculty of Transportation Sciences, Prague, Czechia
  • Daniel Kytýř Czech Academy of Sciences, Institute of Theoretical and Applied Mechanics, Prague, Czechia
  • Petr Koudelka Czech Technical University in Prague, Faculty of Transportation Sciences, Prague, Czechia

DOI:

https://doi.org/10.21014/actaimeko.v15i3.2485

Keywords:

SLA printed resins, split Hopkinson pressure bar, strain-rate sensitivity, Cowper-Symonds material model

Abstract

Photopolymer resins produced by stereolithography (SLA) are widely used for manufacturing lattice structures and mechanical metamaterials intended for experimental validation of numerically designed structures. Reliable simulations of their response under dynamic loading require constitutive models capable of describing strain-rate-dependent material behavior; however, suitable experimental data for commercially available SLA resins remain limited.
This study presents the experimental characterization and Cowper--Symonds model calibration of two SLA printing materials: Phrozen Aqua Blue Resin and Phrozen High-Resolution RPG Resin. Cylindrical bulk specimens were manufactured by SLA and tested under quasi-static compression and high-strain-rate compression using a split Hopkinson pressure bar apparatus. The resulting stress–strain curves were used to evaluate the strain-rate sensitivity of both resins. Yield stress values determined at different strain rates served as input data for the calibration of the Cowper--Symonds parameters. The calibrated material parameters are intended for implementation in LS-DYNA together with the quasi-static material response, for explicit simulations of dynamically loaded SLA-printed structures. The results provide experimentally derived material data for future numerical simulations of SLA-printed lattice structures and mechanical metamaterials.

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Published

2026-09-29

Issue

Vol. 15 No. 3 (2026)

Section

Research Papers

License

Copyright (c) 2026 Tomáš Doktor, Veronika Drechslerová, Jan Falta, Tomáš Fíla, Václav Rada, Bohumil Hora, Daniel Kytýř, Petr Koudelka

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