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- W26941451 abstract "The dependence of the dynamic plane-strain fracture toughness, K/sub Id/, on temperature and crack velocity was measured for propagating cracks in 1020 steel. The dynamics of crack propagation in double-cantilevered specimens was recorded using electro-resistivity techniques. The fracture surface energy was found by comparing the crack propagation to solutions of crack motion in wedged-open cantilevered specimens. The K/sub Id/ behavior was investigated over a range of temperatures from -196/sup 0/C to -50/sup 0/C and crack velocities of 3x10/sup -3/ to 5x10/sup -2/ of ..sqrt..(E/p) The rate and temperature dependence of K/sub Id/ over the range of T and v/sub c/ investigated is well described by: 1/K/sup 2//sub Id/=-A(ln v/sub o//v/sub c/)T+B where A, B, and v/sub o/ are experimental constants. A dynamic value of K/sub Id/ was 70% of K/sub Ic/ at the same temperature, although in the temperature and crack velocity range investigated the fracture surface energy varies by a factor of 6. The temperature T/sub T/=B/Aln(v/sub o//v/sub c/) for which 1/K/sup 2//sub Id/=0 is similar to Charpy impact transition temperature values when v/sub c/ = 3x10/sup -3/ ..sqrt..(E/p). If the plane-strain stress condition could be maintained, then T/sub T/ would define a brittle-ductile transition temperature for dynamic plane-strain more » fracture toughness. The constants A and B are interpreted by understanding the plastic energy dissipated by a moving crack. « less" @default.
- W26941451 created "2016-06-24" @default.
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- W26941451 date "1971-10-01" @default.
- W26941451 modified "2023-09-23" @default.
- W26941451 title "Dependence of the fracture toughness of mild steel on temperature and crack velocity. [1020 Steel]" @default.
- W26941451 hasPublicationYear "1971" @default.
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