DEVELOPMENT OF AN INTRALAMINAR SHEAR FIXTURE FOR THE TESTING OF COMPOSITE SPECIMENS OUT OF THEIR ORTHOTROPY AXES - Laboratoire de mécanique et technologie
Communication Dans Un Congrès Année : 2024

DEVELOPMENT OF AN INTRALAMINAR SHEAR FIXTURE FOR THE TESTING OF COMPOSITE SPECIMENS OUT OF THEIR ORTHOTROPY AXES

Développement d'un montage de cisaillement intra-laminaire pour la caractérisation d'éprouvettes composites via des essais hors-axes d'orthotropie

Résumé

The design of innovative ceramic matrix composites parts requires a precise characterization of the materials to avoid oversizing costs. Several methods already exist to characterize the shear properties of composite laminates, classically the tensile tests on ±45° balanced specimens (EN 6031), known for their effectiveness. However, sampling specimens directly from parts or structures restricts the ability to select ply stacking sequences. Out-of-orthotropy-axes tests on unidirectional composite specimens allow for shear properties determination, but the stress state in the specimens is highly heterogeneous [1] [3], affecting measurements quality, especially for shear fracture stresses. Rotating fixtures have been developed to mitigate edge effects due to clamped jaws [2] [3] and homogenize the stress state in the specimens, but cannot reach high levels of stress. A double ball-jointed fixture for intralaminar shear testing of composite unidirectional specimens is hereby introduced. The in-plane rotations allow to limit the stresses heterogeneity one can observe in out-of-orthotropy-axes testings with clamped jaws. A comparison between a clamped-jawed tensile test on (±45°)ns stackings, and tests performed on the developed fixture with off-axis UD specimens is proposed to validate the method.
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Dates et versions

hal-04667499 , version 1 (05-08-2024)

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  • HAL Id : hal-04667499 , version 1

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Valentin Iallonardi, Baranger Emmanuel, Hortense Laeuffer, Luis Torres, Rémi Legroux, et al.. DEVELOPMENT OF AN INTRALAMINAR SHEAR FIXTURE FOR THE TESTING OF COMPOSITE SPECIMENS OUT OF THEIR ORTHOTROPY AXES. 21st European Conference on Composite Materials (ECCM21), Centrale Nantes; Nantes Université, Jul 2024, Nantes, France. ⟨hal-04667499⟩
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