Before revision: Toughening 200px|Graph comparing stress–strain curves for brittle and ductile materials |left When a material has reached the limit of its strength, it usually has the option of either deformation or fracture.
After revision: Toughening 200px|Graph comparing stress–strain curves for brittle and ductile materials When a material has reached the limit of its strength, it usually has the option of either deformation or fracture.