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Dimple Rupture
Dimple rupture is a fracture
mechanism occurring in metals which fail under
conditions of an overload or tearing stress.
Tiny holes, or microvoids, occur in the interior of
a piece of metal when the object is subjected to a
load. As more load is applied the microvoids
gather and form small void pockets in the metal.
When the edges of the pockets meet, at the moment of
fracture, small "cup-like" features(dimples) appear
on the fracture surface.
Photograph A is a scanning
electron micrograph showing dimple rupture at a magnification of 2500x.
Photograph A
Scanning electron micrograph
showing dimple rupture at a magnification of 2500x.
Types of Dimple Rupture:
1)
Shear Dimples
2)
Tearing Dimples
3)
Tensile Dimples
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