What is ductility and post-cracking behaviour?
Concrete is a brittle material. When submitted to tensile stresses it shows an elastic behaviour up to the cracking of the material. Once the crack arises, the resistance is zero, which means that the collapse is very sudden and brutal. To avoid such an unpredictable behaviour, the brittle material concrete is reinforced by traditional rebar or by steel fibres. These methods of reinforcement guarantee that the bearing capacity loss after cracking is not total. This is referred to as post-cracking behaviour. Post-cracking behaviour can be partially or fully ductile. Full ductility means that the cracked section has a higher resistance than the un-cracked section and shows a so called strain-hardening. When, during the post-cracking behaviour, the bearing capacity is reduced yet not falling to zero, we refer to this as partial ductility or strain-softening. With traditional fibre dosage rates, SFRC typically shows just such a partial ductile behaviour, where the level of ductility depend
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