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• W1963822235 abstract "The conventional Kolsky apparatus (split Hopkinson pressure bar), normally used to obtain dynamic material behavior in uniaxial stress, has been modified to provide conditions approaching uniaxial strain. The modification consists of a massive steel collar which surrounds the disk-shaped specimen and suppresses its radial motion. The collar is composed of two concentric steel cylinders, each 160 mm long; an outer thick-waited jacket of low-carbon steel with an OD of 200 mm and a wall thickness of 75 mm; and an inner liner of AT-300 maraging steel which is press-fitted into the jacket. The ID of the liner is nominally 38 mm, and is slightly flared to allow easy insertion of the specimen. Very close tolerances are maintained between the liner minimum diameter and the specimen diameter; differences in liner and specimen diameters normally do not exceed 2.5 μm. For testing purposes, the specimen is first inserted in the collar and then the specimen/collar assembly is placed between the input and output ban of the Kolsky apparatus. A bell-shaped stress pulse of approximately 40 μs duration and 1.28 GPa amplitude is propagated along the input bar, and a portion of this pulse is transmitted through the specimen into the output bar. Records of strain histories are taken on the input and output bars as well as on the outside of the collar. Data reduction utilizes the conventional Kolsky formulas for the determination of axial stress and strain histories in the specimen, and a supplementary equation has been developed to calculate the radial stress history for ductile metallic specimens. Tests were conducted on both metallic and nonmetallic materials. In the former category, three different aluminum alloys—3003 (as machined or annealed), 2024-T351 and 6061-T651 and oxygen-free copper were tested. Comparisons were made with static test results for these same materials. It was found that the collar provides considerable restraint against radial motion, with an effective modulus of approximately 280 GPa. Significant differences were found between the static and dynamic curves in spite of the fact that loading configurations were identical for both sets of tests. The differences are attributed to strain rate effects, low-temperature creep and differences in the dynamic and static stress histories. Similar trends were observed for dynamic and static measurements made with the collar removed (nearly uniaxial stress condition). In the non-metallic material category, Scotchply, syntactic foam and polypropylene panels were tested. In each case, dramatic differences between stalk and dynamic behavior of die unconstrained specimens were observed, while the constrained specimens exhibited little or even apparent reverse strain-rate effects." @default.
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• W1963822235 date "1978-01-01" @default.
• W1963822235 modified "2023-10-18" @default.
• W1963822235 title "Measurement of dynamic material behavior under nearly uniaxial strain conditions" @default.
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• W1963822235 doi "https://doi.org/10.1016/0020-7683(78)90032-x" @default.
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