SEDL / STP / STP711-EB / STP27451S

Some Comments on Dynamic Crack Propagation in a High-Strength Steel

Bílek, Z
Senior research scientist, Institute of Physical Metallurgy, Czechoslovak Academy of Sciences,

Pages: 8    Published: Jan 1980

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Abstract

The dependence of the dynamic plane-strain fracture toughness, K^Id, on crack velocity was measured for propagating cracks in SAE4340 steel at room temperature. It has been shown that K^Id for SAE4340 steel in the quenched-and-tempered condition increases slowly for increasing crack velocity up to ˙a ≈ 100 m/s and then increases sharply above 100 MNm^−3/2 at ˙a > 1000 m/s.