(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/MAT/LAW25/mat_ID/unit_ID or /MAT/COMPSH/mat_ID/unit_ID

mat_title

E11

E22

Iform

E33

G12

G23

G31

f1

f2

t1

m1

t2

m2

dmax

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

Ioff

Ratio

b

n

fmax

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

c

ICC

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

d3max

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

Fsmooth

Fcut

#RADIOSS STARTER

/UNIT/1

unit for mat

#              MUNIT               LUNIT               TUNIT

                   g                  mm                  ms

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/MAT/COMPSH/1/1

composite example

#              RHO_I

             .001506

#                E11                 E22                NU12     Iform                           E33

              144000               10000                 .25         0                         20000

#                G12                 G23                 G31              EPS_f1              EPS_f2

                4200                4200                4200                   0                   0

#             EPS_t1              EPS_m1              EPS_t2              EPS_m2                dmax

                   0                   0                   0                   0                   0

#              Wpmax               Wpref      Ioff                         ratio

             1000000                   0         0                             0

#                  b                   n                fmax

                   0                   0             1000000

#            sig_1yt             sig_2yt             sig_1yc             sig_2yc               alpha

               10100               10100               10100               10100                   0

#           sig_12yc            sig_12yt                   c          Eps_rate_0       ICC

               10068               10068                   0                   0         0

#          GAMMA_ini           GAMMA_max               d3max

                   0                   0                   0

#  Fsmooth                Fcut

         0                   0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#enddata

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

5.	The material is assumed to be elastic until the Tsai-Wu criterion is fulfilled. After exceeding the Tsai-Wu criterion limit , the material becomes non-linear:

Where, , and are the stresses in the material coordinate system.

The coefficients of the Tsai-Wu criterion are determined from the limiting stresses when the material becomes nonlinear in directions 1, 2 or 12 (shear) in compression or tension, as follows:

Where, the superscripts c and t represent compression and tension, respectively. This criterion represents a second order closed three-dimensional Tsai-Wu surface in , and space.

F is the variable Tsai-Wu criterion limit defined as a function of plastic work (Wp) and the true strain rate ():

Where, is the reference plastic work, b is the plastic hardening parameter, n is the plastic hardening exponent, is the reference true strain rate, and c is the strain rate coefficient.

This Tsai-Wu surface is scaled outwards homothetically in all directions, due to increase in Wp and .

6.	Damage between and is controlled by the damage factor di, which is given by the following equation:

in directions, i = 1, 2.

Stress is reduced according to damage parameter . Damage is reversible between and . When , damage is set to dmax and it is not updated further. Element deletion is controlled by the Ioff flag.

7.	For the plastic work failure criterion, and are defined as follows:

and

When , the stress is set to zero in the layer. Element deletion is controlled by the Ioff flag.

11.

The simple delamination criterion is based on the evaluation of out-of-plane shear strains ( and ). Element stresses and are gradually reduced when the resultant out-of-plane shear lies within . The element is completely removed (fails) if the value of becomes greater than the value of dmax (specified on this material card) in one of the shell layers.

From version 14.0 global material properties (membrane stiffness, bending stiffness, mass, and inertia) are calculated based on the material properties and layup (thicknesses) given in /PROP/TYPE11 card. They are used for stability, mass and interface stiffness. A material is still required at part definition level, but is only used for pre- and post- (visualization “by material”) and its physical characteristics are ignored. The previous formulation where stiffness and mass were calculated from the material associated to the part is still used, if the version number of the input file is 13.0 or earlier.

/ANIM/SHELL/EPSP - for plastic work output
/ANIM/SHELL/TENS/STRAIN – for strain tensor output in the elemental coordinate system
/ANIM/SHELL/TENS/STRESS – for stress tensor output in the elemental coordinate system
/ANIM/SHELL/PHI – angle between elemental and first material direction
/ANIM/SHELL/FAIL – number of failed layers.

PLAS (or EMIN and EMAX) for minimum and maximum plastic work in the shell

WPLAYJJ (JJ=0 to 99) for plastic work in a corresponding layer

16.

The unit of is an energy per unit of volume. If the default value (0) is encountered, the default value is 1 unit of the model (example: or ). For proper conversion of this value if changing units in pre- and post-, it is advised to replace the default value by the true value (1), so that the value of will be automatically converted. Leaving the  field to “0” may result in errors in case of automatic conversion.

Note that a local unit system can be created for the material to avoid conversion.