Abstract
The effect of thermo-oxidative aging on mechanical properties is a key factor in designing composites structures. This paper aims to explore the effects of thermo-oxidative aging on the mechanical behavior, surface deformation and damage evolution of 3-D angle-interlock woven composites (3DAWC) under compression. A bilinear stress-strain curve with high failure strength and compressive modulus were obtained for the unaged sample. The transition region of the stress-strain curve disappeared for the aged sample due to epoxy resin degradation and cracks. The transition strain decreases as the interface damage starts earlier after thermo-oxidative aging. The surface strain, off-plane displacement and Poisson's ratio distribution show structural correlation during compression. Both the surface average strain and the average Poisson's ratio decrease with aging time. A finite element model has been established to explore the mechanical degradation mechanisms.
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