By T. Z. Blazynski
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Extra info for Applied Elasto-plasticity of Solids
4 Torsion test The distortion of the specimen experienced in tensile and compressive testing, on the one hand, and the relatively low rates of straining obtainable, on the other , have led to the increasing use of the torsion test. Of particular interest is the deformation of a solid, cylindrical specimen which, unlike a hollow tubular one, will not distort when stressed. In this test, the applied torque and resulting twist are measured and plotted against each other to give a curve similar to a stress-strain curve.
Serves only as a usefu l approximation and gives reasonable numerical answers when approximation to pure sliding is possible. A composite model of frictional resistance is necessary to describe the effects observed in most practical cases. This acknowledges the physical impossibility of attaining perfectly smooth surfaces and recognises the presence of a large number of asperities on any surface considered. The model postulates that the actual contact between the rubbing surfaces will be at the asperities only and that, naturally, the movement of the surfaces will result in their mechanical interlocking.
1 Introduction Although the phenomenon of friction assumes particular importance in metalform ing processes that rely on the sliding or rubbing of processed specimens against forming tools , we introduce the topic here because frictional effects must be taken into account whenever moving machine components and parts exist. We have already noted the detrimental effect that friction has on the un iaxial com pression tests ; it must be equally clear that its effect on bearings , turbine and compressor blades , and other similar sliding or rotating assemblies, will be serious.
Applied Elasto-plasticity of Solids by T. Z. Blazynski