Abstract
Kink-band formation is an important mechanism limiting the compressive strength of high strength composites. A cohesive zone model is used to model the material in a unidirectional carbon fibre composite that forms the kink-band. Equilibrium of configurational forces is used to design and evaluate the experiments. Microscopic studies show that a kink-band is formed with the height of about 200μm. The corresponding cohesive law has a peak stress of about 1.5GPa, a compression at failure of about 50μm and a fracture energy of about 25kJ/m2.
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