Strength, ductility and toughness are three very important, closely related material properties. The yield and ultimate strengths tell us how much stress a material can withstand, and are often used to define failure. Ductility tells us how much plastic deformation a material undergoes before fracture. Brittle materials fracture at very small strains, and can fail catastrophically. Toughness tells us how much energy a material can absorb before fracture. It is closely linked to both strength and ductility. The Efficient Engineer is a channel aimed at mechanical and civil engineers. The mission is to simplify engineering concepts, one video at a time! --- Follow me on Twitter: https://twitter.com/efficiengineer Support the channel on Patreon: https://www.patreon.com/efficientengineer