Cup and cone type fracture occurs in the case of

Cup and cone type fracture occurs in the case of

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Round specimen of ductile metals



When a metallic body is subjected to stress it withstands the applied stress. When the body is no longer able to withstand the applied stress it starts cracking. Cracking goes through two stages viz. crack initiation and crack propagation. The formation of crack, due to the release of stress in a metallic body that ultimately results in the separation of the body into two or more parts, is known as a fracture. There are different types of fracture viz. ductile, brittle, fatigue, etc. 


Fractures can be classified broadly as ductile fractures and brittle fractures. A ductile fracture is associated with considerable plastic deformation. An appreciable amount of gross plastic deformation in the form of change in dimension (increased length or local decrease in cross-section) can actually be observed in the case of a ductile fracture. A typical cup and cone fracture of a ductile metal as observed in a tensile test is an example of a ductile fracture.  A ductile fracture is characterized by a fibrous fracture surface with a prominent shear lip. Thus a typical cup and cone fracture of a moderately ductile metal, a rupture following drawing of a highly ductile metal viz. gold or lead to a point and mere separation of metal by 45° shear are all examples of ductile fractures.

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