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/MAT/LAW34 (BOLTZMAN)

/MAT/LAW34 (BOLTZMAN)

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/MAT/LAW34 - Boltzmann (Visco-Elastic) Material

Description

This law describes the Boltzmann (visco-elastic) material. This law is applicable only for solid elements and can be used to model polymers and elastomers.

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/MAT/LAW34/mat_ID/unit_ID or /MAT/BOLTZMAN/mat_ID/unit_ID

mat_title

 

 

 

 

 

 

 

 

K

 

 

 

 

 

 

 

 

G0

GI

 

 

 

 

P0

 

 

 

 
hmtoggle_plus1Flag Definition

Field

Contents

SI Unit Example

mat_ID

Material identifier

(Integer, maximum 10 digits)

 

unit_ID

Optional unit identifier

(Integer, maximum 10 digits)

 

mat_title

Material title

(Character, maximum 100 characters)

 

Initial density

(Real)

K

Bulk modulus

(Real)

G0

Short time shear modulus

(Real)

GI

Long time shear modulus

(Real)

Decay constant

(Real)

P0

Initial air pressure

(Real)

Foam vs. polymer density ratio

(Real)

 

Initial volumetric strain

(Real)

 
hmtoggle_plus1Example (Plastic)

#RADIOSS STARTER

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

/UNIT/1

unit for mat

                 Mg                  mm                   s

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

#-  2. MATERIALS:

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

/MAT/BOLTZMAN/1/1

plastic

#              RHO_I

               2E-10

#                  K

               66.67

#                 G0                  G1                Beta

                 100                 100               50000

#                 P0                 Phi              Gamma0

                   0                   0                   0

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

#ENDDATA

/END

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
hmtoggle_plus1Comments
1.For closed cell foam material, the pressure may be augmented:

where,

and

2.Stress deviator for viscoelastic material:

While the shear relaxation moduli is:

Where,

Gi is the long time shear module

Gs is the short time shear module

is the decay constant with

When t = 0, then and when then,

See Also:

Material Compatibility

Law Compatibility with Failure Model

/MAT/LAW34 in Theory Manual