12.14 Constitutive Experiment Requests

CONSTITUTIVE_EXPERIMENT

CONSTITUTIVE_ EXPERIMENT Number_of_experiments = nexp, etc...

< experiment data >

< mode-shapes data >

< material data Þ only required if element_number = 0 >

< terminate with a blank record >

Perform constitutive experiments on material model.

Note Variable Name Type Default Description

Number_of_experiments integer [0] Number of constitutive experiments

(1) Number_of_mode_shapes integer [0] Number of mode shapes

Mode_shape list [strain] Mode shape option:

strain / stress Prescribed strain or stress amplitudes

(2) Fluid_bulk_load_time integer [0] Fluid bulk load-time function number

Print list [on] Print stress/strain amplitudes option

on / off

(3) Element_number integer [0] Element number 0

Group_number integer [0] Group Number 0 and NUMEG

Stress_point_number integer [0] Stress point number 1 and Nspts

EXAMPLE

Constitutive_Experiment /

Number_of_experiments = 1 / #

Number_of_mode_shapes = 1 / #

Mode_shape = stress # prescribe stress amplitudes

Experiment 1 , 1000 , 1.00 # 1000 time steps with time step = 1.0

Mode-Shape 1 , 2 , 0. 0 , -2.e4 , 0.0 # ₂₂ = -2.e4 with load-time function 2

Notes/

(1) The prescribed stress or strain amplitudes are prescribed by using NSHAP mode-shapes and corresponding load-time functions (Section 8.0).

(2) Corresponds to the load-time function input in Section 8.0. Only applicable to stress-driven experiments. This option allows variable draining conditions to be used (e.g., BULKF = 0.0 for drained conditions, BULKF = ALF for undrained conditions).

(3) This allows constitutive experiments to be performed on material data previously defined within existing element groups.

12.14.1 Experiments (Nexp)

EXPERIMENT

EXPERIMENT n, nts(n), dt(n)

Note Variable Type Default Description

N integer [0] Experiment number 1 and Nexp

NTS(N) integer [0] Number of time steps

DT(N) real [0.0] Time-step size

12.14.2 Mode-Shapes (Nshape)

MODE_SHAPE

MODE_SHAPE lshap, ltime, <f (i, lshap ), i = 1, 6>

Note Variable Type Default Description

LSHAP integer [0] Mode shape number 1 and Nshape

LTIME integer [0] Load time function number 1 and NLF

(1) F(I, LSHAP) real [0.0] Mode-shape; i = 1, 6

Notes/

(1) The prescribed stress or strain amplitudes are prescribed by using load-time functions (Chapter 8) and NSHAP mode-shapes. The corresponding mode-shapes are defined for each i (i = 1, 6) as follows:

Strain driven case

Stress driven case

12.14.3 Material Data (only if required)

Only required if Element_number = 0. The data for material properties must follow. Consult Chapter 10 for the required input of the individual material models.

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