Simultaneous measurements of stress intensity and toughness for fast-running cracks in steel |
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Authors: | D A Shockey J F Kalthoff W Klemm S Winkler |
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Institution: | (1) Department of Metallurgy and Fracture Mechanics, SRI International, 94025 Menlo Park, CA;(2) Fraunhofer-Institut für Werkstoffmechanik, 7800 Freiburg, West Germany |
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Abstract: | Simultaneous measurements of the dynamicstress-intensity factorK
I
dyn and the dynamic-fracture toughnessK
ID were made in a high-strength steel to investigate the relation between energy delivered to and energy absorbed by rapidly
propagating cracks. Values ofK
I
dyn were obtained intermittently during the propagation history by the shadow optical method of caustics from high-speed photographs
of the moving crack tips. Values ofK
ID were calculated from temperature maxima recorded by thermocouples near the crack path. The results indicate that for fast-running
cracks, the change in energy available at the crack tip can be significantly less than the energy absorbed in crack extension,
suggesting that currently used dynamic-energy-balance methods for determining dynamic-fracture toughnesses may provide erroneous
values. |
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Keywords: | |
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