We performed compression test on clear resin cylindrical specimen according to ASTM D695 (Standard Test Method for Compressive Properties of Rigid Plastics).
Post curing was done using CureBox (https://wickedengineering.com/curebox/) in ideal conditions as mentioned in Dr. Zguris’s paper (https://formlabs.com/media/upload/How-Mechanical-Properties-of-SLA-3D-Prints-Are-Affected-by-UV-Curing.pdf)
However we obtained a compression modulus of around 147 and 167 ksi, which do not match with Dr. Zguris’s tensile modulus of ~410 ksi. We were expecting that the compressive modulus should be at least equal or higher than the tensile modulus.
Has anyone performed the compressive strength test on clear resin ?
Does anyone have any insight on why we are not getting a modulus of ~410ksi ? Does anyone have any suggestion (ex. post curing) so that we could get a modulus of ~410ksi ?