By T. Z. Blazynski
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Extra resources for Applied Elasto-plasticity of Solids
A tensile test can be carried out on , for instance , a Harding and Campbell bar that uses a tubular input component with a freely sliding, inertia bar enclosed within it. Torsional split bars have also been developed successfully . Strain rates attained in these tests are of the order of 3 x 103 S-1 . 3 Higher rates of straining Strain rates of up to 4 X 104 S-1 have been reached by introducing modifications to the specimens used in the Hopkinson arrangement and to the apparatus itself. A solid cylindrical specimen of the preceding section is replaced either by a flat plate in which a circular hole will be punched out or by a thin strip with a double notch.
Provided that the interlocking in its various forms .. is on a large scale, a situation will eventually arise in which the softer material will begin to yield and plastic flow of the sub-layer will be initiated . This is likely to occur even in the presence of the lubricant if the film breaks down at a sufficient number of points. 577. Once the flow has commenced, however, the concept of the coefficient of friction becomes somewhat meaningless and a numerical friction factor is introduced to enable the calculations of metal-deformation to be made.
2) The definition of the mean strain rate raises certain problems. 2 is concerned only with the time required by a material element to travel through the zone in which the deformation takes place and it does not therefore reflect the variation in the velocity of the strained elements. Therefore, the mean strain rate calculated on this 'time' basis will refer solely to the material element considered, but not to the total volume of the material undergoing deformation. To obtain the mean strain rate for the whole zone of deformation, it is neces sary to refer the strain rate to the distance travelled, rather than to the time taken.