What is Voce hardening law?
Voce hardening law is usually used to describe the rheological behaviors of the aluminum. alloys which exhibit a saturation stress-strain state at high strain levels and at high. temperatures [26-28].
What is Elasto plastic region?
Elastoplasticity is a rate independent phenomenon which, when activated, causes the development of permanent deformation. It is usually considered as the limit case of viscoplasticity, in which the notion of critical stress exists and causes yielding in the material.
What is a viscoplastic fluid?
The viscoplastic fluids are non-Newtonian fluids which behave as an ideal rigid medium in some regions when the external stress is not exceeded a certain critical value called the yield stress ( ), but when the external stress is exceeded above this limit, the fluids behave as (nonlinear) viscous fluids.
What is Elasto plastic Behaviour?
A purely plastic material model describes the material behavior after the onset of plasticity. At this point, the solid materials will undergo irreversible deformation when subjected to loading. For example, a solid metal being shaped by bending or pounding.
What is strain hardening in stress strain curve?
The strain hardening rate is the slope of the stress-strain curve, also called the tangent modulus. is a geometrical effect, and if the true stress rather than the engineering stress were plotted no maximum would be observed in the curve.
What is isotropic hardening?
Isotropic hardening means that the yield surface expands (or shrinks) in a uniform way about the hydrostatic axis. From: Developments in Petroleum Science, 2021.
What is Elasto plastic model?
What is work hardening in Viscoplastic materials?
One consequence of yielding is that as plastic deformation proceeds, an increase in stress is required to produce additional strain. This phenomenon is known as Strain/Work hardening. For a viscoplastic material the hardening curves are not significantly different from those of rate-independent plastic material.
Are the hardening curves of viscoplastic materials different from rate-independent plastic materials?
For a viscoplastic material the hardening curves are not significantly different from those of rate-independent plastic material. Nevertheless, three essential differences can be observed. A change in the rate of strain during the test results in an immediate change in the stress–strain curve.
What is the elastic strain in elastic-perfectly viscoplastic materials?
For elastic-perfectly viscoplastic materials, the elastic strain is no longer considered negligible but the rate of plastic strain is only a function of the initial yield stress and there is no influence of hardening. The sliding element represents a constant yielding stress when the elastic limit is exceeded irrespective of the strain.
What is the rheological model of viscoplasticity?
Rheological models of viscoplasticity. One-dimensional constitutive models for viscoplasticity based on spring-dashpot-slider elements include the perfectly viscoplastic solid, the elastic perfectly viscoplastic solid, and the elastoviscoplastic hardening solid. The elements may be connected in series or in parallel.