BoucWen
Bouc-Wen Model
The BoucWen
model is a phenomenological model. Compared to the original formulation, the following modifications are
applied.
.
.
Theory
The evolution of internal displacement is governed by the differential equation,
Then,
For state determination, is solved by using the Newton method.
Syntax
material BoucWen (1) (2) (3) (4) (5) (6)
# (1) int, unique material tag
# (2) double, elastic modulus
# (3) double, yield stress
# (4) double, hardening ratio
# (5) double, beta, a positive parameter
# (6) double, n, a positive exponent
Caveat
Since it is a phenomenological model, the non-observable internal "displacement" has no physical meaning. For small loops, it violates plasticity postulates.
It is recommended to use a value greater than unity for .
Example
material BoucWen 1 2E5 400 .01 1E-1 2
materialTest1D 1 1E-3 10 20 30 40 50 60 30
material BoucWen 1 2E5 400 .01 2. .6
materialTest1D 1 1E-3 10 20 30 40 50 60 30
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