An alternative interpretation of axial friction test results for viscoplastic materialsстатья
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Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.
Аннотация:A new friction test proposed elsewhere consists of pushing a cylindrical sample of material compressed by axial forces through a tube. This test is called the axial friction test. Friction induces plastic deformation in the sample. In general, plastic deformation is responsible for the evolution of material properties. Experiments demonstrate that a narrow layer with drastically changed material properties is often generated in the vicinity of the friction surface in the axial friction test. This suggests that plastic deformation is localized near the friction surface in this test. The capability of theoretical solutions to predict highly localized plastic deformation near frictional interfaces depends on the material model chosen. Since the thickness of the layer with drastically changed material properties is a measurable quantity, the axial friction test can be used for identifying material models. The present paper deals with rigid viscoplastic models. It is shown that there is a class of such models that predict the existence of a layer of highly localized plastic deformation near friction surfaces.