Abstract: Disclosed herein is a computer implemented method for predicting at least one mechanical property of at least one composite element including at least two layers. The method includes: a) providing at least one input parameter set, where the input parameter set includes a plurality of parameters defining properties of each of the single layers; b) determining at least one geometric model of the composite element based on the input parameter set using at least one design tool; and c) determining at least one mechanical property of the geometric model of the composite element by using at least one numerical simulation, where the mechanical property includes one or more of tension property, pressure property, shear property, temperature property, and a combination thereof.

Abstract: Described herein are photocurable compositions, (A) a polyester urethane acrylate, or methacrylate (A), (B) an acrylamide, or methacrylamide component (B), and (C) a photoinitiator (C), where the polyester urethane acrylate, or methacrylate (A) is obtained by reacting (A1) a hydroxyalkylacrylate, or hydroxyalkylmethacrylate, (A2) an aliphatic diisocyanate, an aliphatic polyisocyanate, a cycloaliphatic diisocyanate, a cycloaliphatic polyisocyanate, an aromatic diisocyanate, or an aromatic polyisocyanate, or mixtures thereof, (A3) a polyester polyol, and (A4) optionally a second polyol. The compositions, from which cured three-dimensional shaped articles having high toughness, high E modulus and impact strength can be made, are particularly suitable for the production of three-dimensional articles by stereolithography.