Abstract
This paper presents an experimental study of the microstructure characteristics and bending behavior of three-dimensional (3D) non-crimp orthogonal composite panel. A novel preform technique is developed to produce 3D non-crimp orthogonal reinforcements with different z-binder volume fractions. Combined with various consolidation pressures in the resin infiltration process, five different types of 3D non-crimp orthogonal composites are measured. Quasi-static three-point bending coupon tests are carried out to measure the bending behavior in both x-axis and y-axis directions. Test results reveal that the average bending failure strength of the coupon with higher z-binder volume fractions is higher than those with lower z-binder volume fractions, while the bending modulus has dependence on the z-binder fineness. In addition, higher consolidation pressure leads to yarns compaction and crimp, which is beneficial for the bending resistance of composites. The fracture surfaces are also studied using scanning electron microscope, and the bending damage modes are discussed. It is noted that the crack causes the z-binder/matrix interface debonding, yarns breakage and fibers pull-out slightly.
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