Figure 1: High speed photography of the extruding specimen approaching the PDV probe Figure 2: Optical image of a soft recovered and reassembled extrusion specimen. Schematically the die was added to the image to aid in description of fully extruded versus segment left in the die Figure 3: Example of the in-situ PDV data collected during a dynamic extrusion experiment. This data clearly demonstrates the “tensile pull back” phenomenon. The peak is the front of the sample as it exits the die. References: 1. Cao, F., et al., Acta Materialia, 2008. 56: p. 5804-5817. 2. Bingert, J.F., et al., Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, 2002. 33(3/SISI): p. 955-963. Transit Time and Velocity through Die 400 450 500 550 600 650 700 750 800 850 900 -1.50E-05 -1.00E-05 -5.00E-06 0.00E+00 5.00E-06 1.00E-05 1.50E-05 2.00E-05 2.50E-05 3.00E-05 time (s) velocity (m/s) Zr. IP dir. 445 m/s Zr. TT dir. 435 m/s Zr. TT dir. 475 m/s Zr. IP dir. 400 m/s Zr. TT dir. 405 m/s 469
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