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-The function of viscosity.

-The function of viscosity.

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The theory of plasticity is in poor condition relative to linear elasticity. All existing formulations are approximate at best, and few have any connection to the fundamental (micromechanical) material mechanism responsible. For this reason, all plasticity theories must be considered empirical. Even worse, detailed testing of a plasticity theory re...

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Context 1
... material is considered to be rigid, has been introduced to improve the numerical behavior of the rigid-plastic formulation. In the FVM simulation, in the area of deformed material in which is 0      , material is assumed rigid, and these areas represents the so-called 'dead zones'. The function of viscosity-effective strain-rate is given in Fig. 2. The initial viscosity max  , which corresponds to 0  is the value at which the plastic flow begins and it is the upper value that viscosity in calculation can reach. One suggestion for definig of 0  in FVM calculation algorithm is given in [3] which used the initial high of workpiece H 0 and the forming velocity v 0 ...
Context 2
... linear extrapolation (line 2) of curve 1, given in Fig. 2, gives the better convergence of numerical procedure. This approach also requires the defining of limiting value of effective strainrate and the additional upper value of viscosity μ max1 , Fig. 2. The differences between the calculated results obtained by using this extrapolation are quite small comparing with the previously described ...
Context 3
... linear extrapolation (line 2) of curve 1, given in Fig. 2, gives the better convergence of numerical procedure. This approach also requires the defining of limiting value of effective strainrate and the additional upper value of viscosity μ max1 , Fig. 2. The differences between the calculated results obtained by using this extrapolation are quite small comparing with the previously described ...

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... There are many solid mechanics problems which can be equivalently considered from the fluid mechanics perspective, for example, in the analysis of extrusion and drawing. Eulerian "fluid" approaches are often used to solve such problems, for example, [46, 48, 50-52, 54, 286, 287, [381][382][383][384][385][386][387][388][389][390][391][392][393]. These methods are more closely related to CFD procedures and are not discussed further here. ...
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