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A
ductile material is one that can be plastically deformed before it fractures.
Ductile
fracture occurs when a material fails in the plastic deformation region
of the stress-strain curve. In a polycrystalline material the fracture
surface tends to show two distinct regions. At the sample axis, the mean
fracture surface is normal to the tensile axis. As the fracture process
comes to the sample surface the mean fracture surface makes an angle of
450 to the tensile
axis, the direction in which the shear stress is maximum. The fracture
surface has a "cup-cone" form, the cone being illustrated in the photograph
of a low carbon steel. |
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