The majority of engineering metals experience moderately ductile failure.

In uniaxial tension this failure mode has a characteristic appearance known as cup and cone fracture.

Cup and cone fracture occurs as a stepwise process. Each step involved in the formation of the fracture surface can be seen below.

1. Initially

2. Microvoid Occurance

3. Microvoid Coalescence

4. Fast Fracture

5. Shear Lip