By John D. Campbell
Read Online or Download Dynamic Plasticity of Metals: Course Held at the Department for Mechanics of Deformable Bodies, July 1970 PDF
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Additional resources for Dynamic Plasticity of Metals: Course Held at the Department for Mechanics of Deformable Bodies, July 1970
Example text
80x 104 em/sec. 45x Icf em/sec 3 X(cm) Fig. 28. Cartesian plot of the Hugoniot elastic wave free-8Urface velocity for annealed Armco iron. The parameter u 0 is the initial impact velocity. [ 42] Chapter 3. Experimental Methods and Results. 1. Tests at Medium Strain Rates. dependent materials have been discussed by Cooper and Campbell [43] . The observed behaviour depends on the interaction of the specimen and test machine, which is largely determined by their relative stiffnesses. If the stiffness of the test machine is much less than that of the specimen ( 1 soft 1 machine), the load-time history may be controlled; if it is much greater ('hard' machine), the strain-time history may be controlled.
The latter work indicates that iron is more strain-rate sensitive in shear 52 Chap. 3: Experimental Methods and Results than in tension or compression. The effect of strain history has been investigated by Klepaczko [7,56]. Thin-walled tubular specimens of polycrystalline aluminium were tested in torsion at five constant strain rates in the range 1 · 6 x 1o·s to 0. 6 2 4 s- 1 • Similar speci- mens were then tested under two types of varying strain rate: either at the lowest rate followed by unloading and reloading at the highest rate, or vice versa.
46. Davies bar used for dynamic stress-strain measurements . [58) rods, between which a small specimen is held. Stress waves in the specimen are neglected, since their transit time is small, while those in the elastic rods can be allowed for by applying elastic wave theory. The mean stress and strain in the specimen can thus be obtained as functions of time from measurements made of the waves propagated in the two rods. This method of test has been used for compression loading [58 - 66] and has also been adapted for tension [67 - - 69].