Abstract
Gas gun experiments combined with velocity interferometric techniques have been used to experimentally determine the loading behavior of a Coors-AD995 alumina rod 19 mm in diameter by either 74 mm or 151 mm in length. Graded-density materials were used to impact both bare and sleeved alumina rods, while the velocity interferometer was used to monitor the axial-velocity of the free end of the rods. Results of these experiments and CTH calculations will demonstrate a unique feature of this novel test methodology : (1) a time-dependent stress pulse generated during impact allows for a smooth and efficient transition from the initial uniaxial strain loading to a uniaxial stress state as the stress pulse propagates through the rod, and (2) the intermediate loading rates obtained in this configuration lie between those available from split Hopkinson bar and shock-loading techniques and are not achieved easily by either one of these techniques.
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