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Yield strength and flow measurements of tungsten sinter alloys at very high strain rates

Messung der dynamischen Fließspannung von Wolfram-Sinterlegierungen bei extrem hohen Verformungsgeschwindigkeiten
: Tham, R.; Stilp, A.J.

Journal de physique 49 (1988), Nr.9, Beilage Colloque de physique, S.C3/85-C3/90 : Abb.,Lit.
ISSN: 0302-0738
International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading <2, 1988, Ajaccio>
Fraunhofer EMI ()
Aufstauchtest; dynamische Verformung; dynamisches Spannungs-Dehnungs-Diagramm; Fließgrenzenspannung; hohe Verformungsgeschwindigkeit; Messung; Wolfram-Sinterlegierung

Long rods of various tungsten sinter alloys with a tungsten content higher than 90 % were instrumented with strain gauges and struck by a moving anvil at velocities between 100 m/s and 400 m/s. The strain-time history at different locations on the rod's surface was recorded by a 200 MHz transient recorder. The calculated yield stresses ranged at a level up to three times the static value, at a rate of 3000 1/s. In the plastic regime, the shape of the stress-strain curve remained unaffected by the strain rate, with a constant wave velocity for each strain level.