Predicción probabilística de la tenacidad a fractura de la resina epoxi EPOLAM 2025 incluyendo el efecto del radio de Entalla

Design of polymeric components are often concerned with notches as representative constructive details. The fracture assessment of these components based on the assumption of cracked components leads to over-conversative failure predictions. For this reason, several approaches have been proposed based on the apparent fracture toughness Kc N . Most of these approaches, however, are based on deterministic assumptions though the random character exhibited by the observed Kc N values for different notch radii. To this aim, a probabilistic extension of the Theory of Critical Distances (TCD) is proposed in this work to predict the fracture toughness of epoxy resin EPOLAM 2025 CT specimens for different notch radii. Firstly, the TCD is applied to transform each apparent fracture toughness into the equivalent fracture toughness for ρ = 0. Then, by applying plotting position schemes on these transformed values, the fracture toughness is probabilistically defined as a Weibull distribution. Then, the TCD is again used to recover the original values at different notch radii, allowing the Kc N - ρ field to be analytically derived for any notch condition. Finally, the probabilistic predictions are compared with those from the original deterministic TCD method in order to validate the proposed model.