Abstract
The effect of loading rate on the strength and deformation characteristics of tensile tested smoothed round bar specimens and on linear‐elastic and elastic‐plastic fracture toughness values was investigated. Test materials were a high toughness melt of the fine‐grained structural steel 20 MnMoNi 5 5 and two model materials of reduced toughness. The strain rate was varied between ∊̇ = 10−3 and 103 s−1 in the tensile tests, the loading rate between K̇ = 1 and 2 · 106 MPam1/2 s−1 in the fracture toughness tests. The true‐stress true‐strain curve is shifted to higher stresses with increasing strain rate. A reduction of the deformation characteristics was only observed in cases of extremely reduced toughness. However, no brittle fracture at nominal stresses below yield was found in the tensile tests with smoothed specimens. Contrary to that all fracture mechanics tests showed a reduction of the crack initiation toughness with increasing loading rate K̇.
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