MATTVE

Bulk Data Entry Defines material properties for temperature-dependent nonlinear viscoelastic materials.

Format A

Williams-Landel-Ferry (Model = WLF):
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
MATTVE MID Model C C T0

Format B

Arrhenius (Model = ARRHENIU):
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
MATTVE MID ARRHENIU E R T0 Tz

Example A

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
MATTVE 2 WLF 4.0 215.0 10.0

Example B

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
MATTVE 2 ARRHENIU

Definitions

Field Contents SI Unit Example
MID Material identification number that matches the identification number of the corresponding MAT1 entry.

No default (Integer > 0)
Model Viscoelastic material model type.
WLF
Williams-Landel-Ferry model
Arrheniu
Arrhenius model

No default

C WLF constant C.

Default = Blank (Real > 0.0)
C WLF constant C.

Default = Blank (Real > 0.0)
E Activation energy for the Arrhenius model.

No default (Real > 0.0)
R Universal gas constant.

No default (Real > 0.0)
T0 Reference temperature.

No default (Real)
Tz Absolute zero temperature.

No default (Real)

Comments

  1. Support information for MATTVE is:
    Supported Analysis Types Supported Elements
    Nonlinear static and Nonlinear transient, for both small and large displacement cases CHEXA, CTETRA, CPENTA, and CPYRA
  2. The temperature effect on the viscoelastic material is introduced by the thermo-rheologically simple temperature effects:
    σ=t∫0g(f(t)−f(s))˙σ0ds
    Where,
    f(t)=t∫01A(T(s))ds
    The reduced time given by:
    A(T(s))
    Shift function
    T
    Temperature
  3. For temperature-dependent material table lookup for an element with different temperatures at each node, the average temperature of all nodes of the element is considered as reference temperature for table lookup for that particular element.
  4. Two forms of shift functions are supported:
    • Williams-Landel-Ferry form
      log10(A)=−C1(T−T0)C2+(T−T0)
    • Arrhenius form
      ln(A)=E0R(1T−Tz−1T0−Tz)