A combined experimental/numerical investigation on hygrothermal aging of fiber-reinforced composites
B. C.M.Rocha Rocha (TU Delft - Applied Mechanics, Knowledge Centre WMC)
Van Der Meer van der Meer (TU Delft - Applied Mechanics)
S Raijmaekers (Knowledge Centre WMC)
F Lahuerta (Knowledge Centre WMC)
R. P.L. Nijssen (Knowledge Centre WMC)
L. P. Mikkelsen (Technical University of Denmark (DTU))
Bert Sluijs (TU Delft - Materials- Mechanics- Management & Design)
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Abstract
This work investigates hygrothermal aging degradation of unidirectional glass/epoxy composite specimens through a combination of experiments and numerical modeling. Aging is performed through immersion in demineralized water. Interlaminar shear testes are performed after multiple conditioning times and after single immersion/redrying cycles. Degradation of the fiber-matrix interface is estimated using single-fiber fragmentation tests and reverse modeling combining analytical and numerical models. A fractographic analysis of specimens aged at 50°C and 65°C is performed through X-ray computed tomography. The aging process is modeled using a numerical framework combining a diffusion analysis with a concurrent multiscale model with embedded hyper-reduced micromodels. At the microscale, a pressure-dependent viscoelastic/viscoplastic model with damage is used for the resin and fiber-matrix debonding is modeled with a cohesive-zone model including friction. A comparison between numerical and experimental results is performed.
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