Investigation of trapezoidal corrugated aramid/epoxy laminates under large tensile displacements transverse to the corrugation direction

摘要: Corrugated structures are noted for their exhibition of extreme anisotropic stiffness properties which may be useful in aircraft morphing wing skin applications. As part a wider study to compare the corrugated laminates made from different materials and geometries, anomalous experimental results were obtained with trapezoidal aramid/epoxy subjected large tensile deformations transverse corrugation direction. This investigates local failure mechanisms these specimens that explain results. Static cyclic testing identified three stages behaviour structure’s stress vs. global strain response. The majority displacement comes second stage. was attributed aramid fibre compressive delaminations unit cell corner region. phenomenon is comparable pseudo-plastic hinge allows over relatively constant levels. thought not occur glass carbon because it related specifically Analytical numerical analysis showed equivalent elastic modulus laminate can predicted; while complete three-stage also modelled using non-linear finite element elastic–plastic material definitions.