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NLVE 3D Orthotropic Model
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.. code-block:: sierrainput

   BEGIN PARAMETERS FOR MODEL NLVE_3D_ORTHOTROPIC
     #
     # Elastic constants
     # 
     YOUNGS MODULUS = <real>
     POISSONS RATIO = <real>
     SHEAR MODULUS  = <real>
     BULK MODULUS   = <real>
     LAMBDA         = <real>
     TWO MU         = <real>
     #
     # Material coordinates system definition
     #
     COORDINATE SYSTEM             = <string> coordinate_system_name
     DIRECTION FOR ROTATION        = <real> 1|2|3
     ALPHA                         = <real> (degrees)
     SECOND DIRECTION FOR ROTATION = <real> 1|2|3
     SECOND ALPHA                  = <real> (degrees)
     #
     #
     #
     FICTITIOUS LOGA FUNCTION = <string>fict_loga_function_name
     FICTITIOUS LOGA SCALE FACTOR = <real>fict_loga_scale_factor
     #
     # In each of the five "PRONY" command lines and in
     # the RELAX TIME command line, the value of i can be from
     # 1 through 30
     #
     1PSI PRONY <integer>i = <real>psi1_i
     2PSI PRONY <integer>i = <real>psi2_i
     3PSI PRONY <integer>i = <real>psi3_i
     4PSI PRONY <integer>i = <real>psi4_i
     5PSI PRONY <integer>i = <real>psi5_i
     RELAX TIME <integer>i = <real>tau_i
     REFERENCE TEMP = <real>tref
     REFERENCE DENSITY = <real>rhoref
     WLF C1 = <real>wlf_c1
     WLF C2 = <real>wlf_c2
     B SHIFT CONSTANT = <real>b_shift
     SHIFT REF VALUE = <real>shift_ref
     WWBETA 1PSI = <real>wwb_1psi
     WWTAU 1PSI = <real>wwt_1psi
     WWBETA 2PSI = <real>wwb_2psi
     WWTAU 2PSI = <real>wwt_2psi
     WWBETA 3PSI = <real>wwb_3psi
     WWTAU 3PSI = <real>wwt_3psi
     WWBETA 4PSI = <real>wwb_4psi
     WWTAU 4PSI = <real>wwt_4psi
     WWBETA 5PSI = <real>wwb_5psi
     WWTAU 5PSI = <real>wwt_5psi
     DOUBLE INTEG FACTOR = <real>dble_int_fac
     REF RUBBERY HCAPACITY = <real>hcapr
     REF GLASSY HCAPACITY = <real>hcapg
     GLASS TRANSITION TEM = <real>tg
     REF GLASSY C11 = <real>c11g
     REF RUBBERY C11 = <real>c11r
     REF GLASSY C22 = <real>c22g
     REF RUBBERY C22 = <real>c22r
     REF GLASSY C33 = <real>c33g
     REF RUBBERY C33 = <real>c33r
     REF GLASSY C12 = <real>c12g
     REF RUBBERY C12 = <real>c12r
     REF GLASSY C13 = <real>c13g
     REF RUBBERY C13 = <real>c13r
     REF GLASSY C23 = <real>c23g
     REF RUBBERY C23 = <real>c23r
     REF GLASSY C44 = <real>c44g
     REF RUBBERY C44 = <real>c44r
     REF GLASSY C55 = <real>c55g
     REF RUBBERY C55 = <real>c55r
     REF GLASSY C66 = <real>c66g
     REF RUBBERY C66 = <real>c66r
     REF GLASSY CTE1 = <real>cte1g
     REF RUBBERY CTE1 = <real>cte1r
     REF GLASSY CTE2 = <real>cte2g
     REF RUBBERY CTE2 = <real>cte2r
     REF GLASSY CTE3 = <real>cte3g
     REF RUBBERY CTE3 = <real>cte3r
     LINEAR VISCO TEST = <real>lvt
     T DERIV GLASSY C11 = <real>dc11gdT
     T DERIV RUBBERY C11 = <real>dc11rdT
     T DERIV GLASSY C22 = <real>dc22gdT
     T DERIV RUBBERY C22 = <real>dc22rdT
     T DERIV GLASSY C33 = <real>dc33gdT
     T DERIV RUBBERY C33 = <real>dc33rdT
     T DERIV GLASSY C12 = <real>dc12gdT
     T DERIV RUBBERY C12 = <real>dc12rdT
     T DERIV GLASSY C13 = <real>dc13gdT
     T DERIV RUBBERY C13 = <real>dc13rdT
     T DERIV GLASSY C23 = <real>dc23gdT
     T DERIV RUBBERY C23 = <real>dc23rdT
     T DERIV GLASSY C44 = <real>dc44gdT
     T DERIV RUBBERY C44 = <real>dc44rdT
     T DERIV GLASSY C55 = <real>dc55gdT
     T DERIV RUBBERY C55 = <real>dc55rdT
     T DERIV GLASSY C66 = <real>dc66gdT
     T DERIV RUBBERY C66 = <real>dc66rdT
     T DERIV GLASSY CTE1 = <real>dcte1gdT
     T DERIV RUBBERY CTE1 = <real>dcte1rdT
     T DERIV GLASSY CTE2 = <real>dcte2gdT
     T DERIV RUBBERY CTE2 = <real>dcte2rdT
     T DERIV GLASSY CTE3 = <real>dcte3gdT
     T DERIV RUBBERY CTE3 = <real>dcte3rdT
     T DERIV GLASSY HCAPACITY = <real>dhcapgdT
     T DERIV RUBBERY HCAPACITY = <real>dhcaprdT
     REF PSIC = <real>psic_ref
     T DERIV PSIC = <real>dpsicdT
     T 2DERIV PSIC = <real>d2psicdT2
     PSI EQ 2T = <real>psitt
     PSI EQ 3T = <real>psittt
     PSI EQ 4T = <real>psitttt
     PSI EQ XX 11 = <real>psiXX11
     PSI EQ XX 22 = <real>psiXX22
     PSI EQ XX 33 = <real>psiXX33
     PSI EQ XX 12 = <real>psiXX12
     PSI EQ XX 13 = <real>psiXX13
     PSI EQ XX 23 = <real>psiXX23
     PSI EQ XX 44 = <real>psiXX44
     PSI EQ XX 55 = <real>psiXX55
     PSI EQ XX 66 = <real>psiXX66
     PSI EQ XXT 11 = <real>psiXXT11
     PSI EQ XXT 22 = <real>psiXXT22
     PSI EQ XXT 33 = <real>psiXXT33
     PSI EQ XXT 12 = <real>psiXXT12
     PSI EQ XXT 13 = <real>psiXXT13
     PSI EQ XXT 23 = <real>psiXXT23
     PSI EQ XXT 44 = <real>psiXXT44
     PSI EQ XXT 55 = <real>psiXXT55
     PSI EQ XXT 66 = <real>psiXXT66
     PSI EQ XT 1 = <real>psiXT1
     PSI EQ XT 2 = <real>psiXT2
     PSI EQ XT 3 = <real>psiXT3
     PSI EQ XTT 1 = <real>psiXTT1
     PSI EQ XTT 2 = <real>psiXTT2
     PSI EQ XTT 3 = <real>psiXTT3
     REF PSIA 11 = <real>psiA11
     REF PSIA 22 = <real>psiA22
     REF PSIA 33 = <real>psiA33
     REF PSIA 12 = <real>psiA12
     REF PSIA 13 = <real>psiA13
     REF PSIA 23 = <real>psiA23
     REF PSIA 44 = <real>psiA44
     REF PSIA 55 = <real>psiA55
     REF PSIA 66 = <real>psiA66
     T DERIV PSIA 11 = <real>dpsiA11dT
     T DERIV PSIA 22 = <real>dpsiA22dT
     T DERIV PSIA 33 = <real>dpsiA33dT
     T DERIV PSIA 12 = <real>dpsiA12dT
     T DERIV PSIA 13 = <real>dpsiA13dT
     T DERIV PSIA 23 = <real>dpsiA23dT
     T DERIV PSIA 44 = <real>dpsiA44dT
     T DERIV PSIA 55 = <real>dpsiA55dT
     T DERIV PSIA 66 = <real>dpsiA66dT
     REF PSIB 1     = <real> psiB1
     REF PSIB 2     = <real> psiB2
     REF PSIB 3     = <real> psiB3
     T DERIV PSIB 1 = <real> dpsiB1dT
     T DERIV PSIB 2 = <real> dpsiB2dT
     T DERIV PSIB 3 = <real> dpsiB3dT
     PSI POT TT     = <real> psipotTT
     PSI POT TTT    = <real> psipotTTT
     PSI POT TTTT   = <real> psipotTTTT
     PSI POT XT 1   = <real> psipotXT1
     PSI POT XT 2   = <real> psipotXT2
     PSI POT XT 3   = <real> psipotXT3
     PSI POT XTT 1  = <real> psipotXTT1
     PSI POT XTT 2  = <real> psipotXTT2
     PSI POT XTT 3  = <real> psipotXTT3
     PSI POT XXT 11 = <real> psipotXXT11
     PSI POT XXT 22 = <real> psipotXXT22
     PSI POT XXT 33 = <real> psipotXXT33
     PSI POT XXT 12 = <real> psipotXXT12
     PSI POT XXT 13 = <real> psipotXXT13
     PSI POT XXT 23 = <real> psipotXXT23
     PSI POT XXT 44 = <real> psipotXXT44
     PSI POT XXT 55 = <real> psipotXXT55
     PSI POT XXT 66 = <real> psipotXXT66
   END [PARAMETERS FOR MODEL NLVE_3D_ORTHOTROPIC]

The NLVE three-dimensional orthotropic model is a nonlinear viscoelastic orthotropic continuum model that describes the behavior of fiber-reinforced polymer-matrix composites.  In addition to being able to model the linear elastic and linear viscoelastic behaviors of such composites, it also can capture both "weak" and "strong" nonlinear viscoelastic effects such as stress dependence of the creep compliance and viscoelastic yielding. This model can be used in both Presto and Adagio.

Because the NLVE model is still under active development and also because it has an extensive list of command lines, we have not followed the typical approach in documenting this model.