Proyecto de Investigación: PREDICCION PROBABILISTICA DE DAÑO Y FALLO A FATIGA: APLICACION A COMPONENTES Y ESTRUCTURAS DE MATERIALES POLIMERICOS
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ID
DPI2016-80389-C2-2-R
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Publicaciones
Probabilistic Assessment of Fracture Toughness of Epoxy Resin EPOLAM 2025 Including the Notch Radii Effect
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-06-03) Álvarez Vázquez, A.; Muñiz Calvante, M.; Fernández Fernández, P.; Fernández Canteli, A.; Lamela Rey, M. J.; Pintado, J. M.; Agencia Estatal de Investigación (AEI); Muñiz Calvente, M. [0000-0003-1769-2309]; Álvarez Vázquez, A. [0000-0001-6264-9938]; Fernández Canteli, A. [0000-0001-8071-9223]
Many design scenarios of components made of polymer materials are concerned with
notches as representative constructive details. The failure hazard assessment of these components
using models based on the assumption of cracked components leads to over-conservative failure
estimations. Among the different alternative approaches proposed that are based on the apparent
fracture toughness, K
N
c
is considered. In so doing, the current deterministic underlying concept
must be replaced by a probabilistic one to take into account the variability observed in the failure
results in order to ensure a reliable design. In this paper, an approach based on the critical distance
principle is proposed for the failure assessment of notched EPOLAM 2025 CT samples with each
different notch radii (ρ) including a probabilistic assessment of the failure prediction. First, each
apparent fracture toughness is transformed into the equivalent fracture toughness for ρ = 0 based
on the critical distances theory. Then, once all results are normalized to the same basic conditions, a
Weibull cumulative distribution function is fitted, allowing the probability of failure to be predicted
for different notch radii. In this way, the total number of the specimens tested in the experimental
campaign is reduced, whereas the reliability of the material characterization improves. Finally, the
applicability of the proposed methodology is illustrated by an example using the own experimental
campaign performed on EPOLAM 2025 CT specimens with different notch radii (ρ).
