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Article Dans Une Revue Engineering Fracture Mechanics Année : 2023

Experimental characterization of tensile and compressive translaminar fracture toughness coupling multi-physics measurements

Résumé

The study of the failure modes of carbon fiber reinforced polymers is essential due to their extensive use in industry. Translaminar failure (at the scale of the laminate) has been studied extensively the main goal being to compute the critical strain energy release rate in mode I of the ply G IC_ply but large variations can be observed between papers. This study investigates this failure mode of a carbon/epoxy laminate, using Compact Tension (CT) and Compact Compression (CC) specimens. The stacking sequence used is [45/-45/(0/90) 4 ] s where 45° plies on the outside efficiently prevented the buckling of the specimen to be observed, as well as plasticity of the matrix. Moreover, this layup is rather similar to real-life industrial stacking sequences. Strains fields and axes displacement were obtained using digital image correlation. Infrared images were used to follow the crack propagation during the loading of the specimen and compared to DIC and X-ray tomography crack length measurements. IR measurements studied from a qualitative point of view were thus shown to be an efficient and reliable method. G IC of the laminate G IC_lam was computed with both the ASTM-E399 and compliance methods, and finally G IC_ply was computed using a rule of mixtures. Secondary damage was detected and its effects on the energy dissipated were quantified using strain fields, X-ray and infrared images. This enabled a more accurate rule of mixtures to be redefined. The failure scenarios of all specimens were eventually exhibited. G IC_ply values in tension were found to be higher than in the literature whereas in compression it was found to be lower than in the literature, due to crack propagation being detected earlier by means of IR measurements.
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Dates et versions

hal-04190997 , version 1 (30-08-2023)

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R Rutar, J Serra, Q Bausiere, C Bouvet. Experimental characterization of tensile and compressive translaminar fracture toughness coupling multi-physics measurements. Engineering Fracture Mechanics, In press, ⟨10.1016/j.engfracmech.2023.109568⟩. ⟨hal-04190997⟩
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