A Principles of Hyperplasticity part 11 pps
A Principles of Hyperplasticity part 11 pps
... pressure and temperature each appear as a partial derivative of the in-
ternal energy of the skeleton and of the pore fluid. The fact that both derivatives
are related to the same value of the ... strain rate: comparison between theory and data
from Vaid and Campanella (1977)
not captured accurately. Figure 11. 8 shows the variation of peak strength with
strain rate as observ...
A Principles of Hyperplasticity Part 2 ppsx
... notation for large strain analysis, and often developing
a somewhat axiomatic approach in which thermodynamics is introduced at
a very general level. The disadvantages of this approach are twofold. ... plastic strains have become well established
over many years, but they are based on empirical observation, first of metals and
later of many other materials. The concept of a
y...
A Principles of Hyperplasticity Part 1 pdf
... similar variables
o
a
initial value of
a
a
rate of
a
with time,
{w w
aat
a
material derivative,
{
,
ii
aaav
ˆ
a
any function of the internal variable
K
,
{K
ˆˆ
aa
... is certainly large, and can encompass a very wide range of rate-
independent materials within a single framework.
It should also be stated that, as far as the authors are aware, i...
A Principles of Hyperplasticity Part 3 ppt
... internal energy expression is related to a par-
ticular aspect of the physical behaviour of the material. Once a familiarity is
established with the aspects of behaviour that are related to particular ... is that the state of
a material is entirely determined by the values of a certain set of independent
variables: the kinematic variables (strain and internal variables)...
A Principles of Hyperplasticity Part 4 ppt
...
instance, often forms a central part of a finite element analysis. Therefore, one of
the most important criteria that needs to be applied to the formulation of any
model is that the incremental ... strains (
e.
g.
incompressible behaviour) or on the rates of the internal variables (
e.
g.
dilational constraints for granular materials). A full treatment of constraint...
A Principles of Hyperplasticity Part 5 ppt
... de-
termined by calibration against experimental unloading-reloading curves.
A variety of forms have been suggested in the literature.
The advantage of the bounding surface approach is that, apart from ... Models
The main features of hyperplasticity are the compactness of the formulation and
a clear link to conventional plasticity. As an illustration of these features, the...
A Principles of Hyperplasticity Part 6 doc
... is that it requires the specification of a tensor-valued functional
(the stress as a functional of the strain history). This is clearly a challenging
task. An advantage of the approach adopted ... instead expresses the
response in terms of functionals of the history of the material (usually through
the history of strain and temperature). Both approaches have advantages...
A Principles of Hyperplasticity Part 7 pdf
... accurately across a wide
range of strain amplitudes. This is important, for instance, in modelling geo-
technical materials (Houlsby, 1999). The disadvantage is that a large number of
material ... the above example, we showed how the choice of a particular pair of func-
tionals leads to a material model with a specific stress-strain curve. In certain
circumstances, it may...
A Principles of Hyperplasticity Part 8 pdf
... Elasticity and Small Strains 177
reproduce the characteristic S-shaped curve in a plot of normalised secant shear
stiffness
o
GG against shear strain
log
J
and to generalise this variation ... linked to another important effect that the elastic
strains may have on the plastic behaviour of coupled materials. Collins (2002)
demonstrated that for coupled materials, derivation of...
A Principles of Hyperplasticity Part 9 doc
... the laws of thermodynamics,
and at the same time account for many important aspects of soil behaviour.
Houlsby and Mortara (2004) explore an approach to the behaviour of fric-
tional materials ... plastic dissipation for geotechnical materials. Hyper-
plasticity is used to analyse the stress–dilatancy relation for shear deformations
of frictional, granular materials. Central to this...
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