(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/MAT/LAW58/mat_ID/unit_ID or /MAT/FABR_A/mat_ID/unit_ID

mat_title

E1

B1

E2

B2

Flex

G0

GT

Gsh

sens_ID

Df

Ds

Gfrot

ZeroStress

N1

N2

S1

S2

Flex1

Flex2

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

fct_ID1

Fscale1

fct_ID2

Fscale2

fct_ID3

Fscale3

fct_ID4

fct_ID5

Fscale4

Fscale5

fct_ID6

Fscale6

#RADIOSS STARTER

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

/UNIT/1

unit for mat

                 kg                   m                   s

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

#-  2. MATERIALS:

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

/MAT/LAW58/1/1

FABRIC

#              RHO_I

               722.5

#                 E1                  B1                  E2                  B2                FLEX

           450000000                   0           450000000                   0                0.01

#                 G0                  GT              AlphaT                 Gsh             sens_ID

                   0            10000000                  60                   0                   0

#                 Df                  Ds               GFROT                             ZERO_STRESS

                 .05                 .05                   0                                       0

#       N1        N2                  S1                  S2               FLEX1               FLEX2

         1         1                 .05                 .05                   0                   0

#  fct_ID1                       Fscale1

         0                             0

#  fct_ID2                       Fscale2

         0                             0

#  fct_ID3                       Fscale3

         0                             0

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

#ENDDATA

/END

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

It is assumed to be softer in the tensile direction during the straightening phase. Young’s modulus in the corresponding direction is scaled by a factor Flexi. The straightening portion of the strain is given by the strains S1 and S2 for direction 1 and 2 correspondingly.

In compression, the Young’s modulus of the fabric material is equal to Flexi * Ei. In biaxial tension there is no straightening phase and the fibers bear loads from the beginning of the loading phase.

5.	The shear stress () can be specified either as a nonlinear function (fct_ID3) of the complementary angle a which is equal to the difference between 90 degrees and the current angle between the anisotropy axes, or the following analytical relationship between shear stress and a is used:

          if    

   if    

and

,    with  

Where, aT  is the shear locking angle, GT is the shear modulus at aT, and G0 is the shear modulus at a = a0.

If the G0 field is set to 0, then its value is calculated to avoid discontinuity of the shear modulus at aT: G0 = G.

aT is an initial complementary angle, which is equal to the difference between 90 degrees and the initial angle between the anisotropy axes defined in the shell property (/PROP/TYPE16). Note that initial pre-stress exists in the fabric material if initial angle between the fiber axes specified in the property is not equal to 90 degrees.

USR1 – stress in fiber direction 1

USR2 – stress in fiber direction 2

USR3 - stress in shear direction

USR4 - strain in fiber direction 1

USR5 - strain in fiber direction 2

USR6 - tan(a)

Due to special material formulation (decoupled DOF with special interaction between fibers), the stress components does not form a stress tensor, therefore usual tensor evaluations such as von Mises stress, principal stresses, and so on, have no meaning for the material.

10.	Gfrot is the shear modulus used to calculate interaction shear stress () between fibers. The friction in-plane shear stress between the fibers is calculated as .