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6. Conclusions
The surface crack defects that develop on the shear edge
in punching of the high-strength steel sheets were characterized by a round hole punching process. The formation
mechanism can be described as follows:
(1) Surface crack defects were caused by cleavage
fracture.
(2) Micro-ductile cracks with maximum lengths of 30
μm to 40 μm, which initiated at inclusions, were detected
as pre-existing cracks in the material at the onset of material separation.
(3) The tensile stress perpendicular to the longitudinal
direction of the micro-ductile crack developed within a
period from the start to the end of material separation. This
tensile stress can produce cleavage fracture when the microductile crack satisfies a critical condition expressed by the
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