MATT1

Bulk Data Entry Specifies temperature-dependent material properties on MAT1 entry fields via TABLEMi or TABLEG entry.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
MATT1 MID T(E) T(G) T(NU) T(RHO) T(A)   T(GE)  
  T(ST) T(SC) T(SS)            

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
MATT1 17 32       15      
  52                

Definitions

Field Contents SI Unit Example
MID Material property identification number that matches the identification number on MAT1 entry.

(Integer > 0)

  
T(E) A TABLEMi or TABLEG entry identification number for the Young's modulus.

(Integer ≥ 0 or blank)

  
T(G) A TABLEMi or TABLEG entry identification number for the shear modulus.

(Integer ≥ 0 or blank)

  
T(NU) A TABLEMi or TABLEG entry identification number for the Poisson's ratio.

(Integer ≥ 0 or blank)

  
T(RHO) A TABLEMi or TABLEG entry identification number for the mass density.

(Integer ≥ 0 or blank)

  
T(A) A TABLEMi or TABLEG entry identification number for the thermal expansion coefficient.

(Integer or blank)

  
T(GE) A TABLEMi or TABLEG entry identification number for the damping coefficient.

(Integer ≥ 0 or blank)

  
T(ST) A TABLEMi or TABLEG entry identification number for the tension stress limit.

(Integer ≥ 0 or blank)

  
T(SC) A TABLEMi or TABLEG entry identification number or the compression limit.

(Integer ≥ 0 or blank)

  
T(SS) A TABLEMi or TABLEG entry identification number for the shear limit.

(Integer ≥ 0 or blank)

  

Comments

  1. Fields 3, 4, and so on, of this entry correspond, field-by-field, to fields 3, 4, and so on, of the MAT1 entry referenced in field 2. The value in a particular field of the MAT1 entry is replaced (if TABLEM1 or TABLEG is used) or modified (if TABLEM2/3/4 is used) by the table referenced in the corresponding field of this entry. In the example shown, E is modified; TABLEMi 32, A is modified by TABLEMi 15; and ST is modified by TABLEMi 52. Blank or zero entries mean that there is no temperature dependence of the field on the MAT1 entry.
  2. The MATT1 entries may refer to blank entries on the respective MAT1 card. In this case, they will be applied to default values of respective parameters. Initial values of E, G, or NU will be supplied according to Comment 4 on the MAT1 entry.
  3. In general, it is recommended to provide table references for each item that is temperature dependent. The following tables summarize the resolution undertaken in cases when either of E, G or NU variations are not defined in the MATT1 entry.
    Table 1. Rod Elements
    T(E) T(G) T(NU) Resolution
    x √ √
    • Constant E is used from MAT1.
    • G is looked up from the table.
    • NU is not considered.
    √ x √
    • E is looked up from the table.
    • Constant G is used from MAT1.
    • NU is not considered.
    √ √ x
    • E and G are looked up from their respective tables.
    • NU is not considered.
    x x √
    • Constant E and G are used from MAT1.
    • NU is not considered.

    √ : Defined in MATT1

    x : Not defined in MATT1

    Table 2. Bar Elements
    T(E) T(G) T(NU) Resolution
    x √ √
    • Constant E is used from MAT1.
    • G is looked up from the table.
    Note: If G < 1E-6, then E and NU (from table) are used to calculate G.
    √ x √
    • E is looked up from the table.
    • Constant G is used from MAT1.
    Note: If G < 1E-6, then E and NU (from table) are used to calculate G.
    √ √ x
    • Constant NU is used from MAT1.
    x x √
    • Constant E and G are used from MAT1
    Note: If G < 1E-6, then E and NU (from table) are used to calculate G.

    √ : Defined in MATT1

    x : Not defined in MATT1

    Table 3. Shell Elements
    T(E) T(G) T(NU) Resolution
    x √ √
    • For Membrane, Bending and their coupling components, G is calculated using E (from MAT1) and NU (from table).
    • For transverse shear component, G is looked up from the table.
    √ x √
    • For Membrane, Bending and their coupling components, G is calculated using E and NU from their respective tables.
    • For transverse shear component,
      • If MID3 is specified in PSHELL, constant G is used from MAT1
      • Else, it is 100 times the maximum value of G calculated for membrane and bending part.
    √ √ x
    • Constant NU is used from MAT1.
    x x √
    • For Membrane, Bending and their coupling components, G is calculated using E (from MAT1) and NU (from table).
    • For transverse shear component,
      • If MID3 is specified in PSHELL, constant G is used from MAT1.
      • Else, it is 100 times the maximum value of G calculated for membrane and bending part.

    √ : Defined in MATT1

    x : Not defined in MATT1

    Table 4. Solid Elements
    T(E) T(G) T(NU) Resolution
    x √ √
    • Constant E is used from MAT1.
    • NU is looked up from the table.
    • E and NU (from table) are used to calculate G.
    √ x √
    • E and NU are looked up from their respective tables.
    • The values of E and NU are used to calculate G.
    • In this case, G from MAT1 has no effect.
    √ √ x
    • Constant NU is used from MAT1.
    x x √
    • Constant E is used from MAT1.
    • NU is looked up from the table.
    • E and NU (from table) are used to calculate G.

    √ : Defined in MATT1

    x : Not defined in MATT1

  4. Temperature-dependent materials can be activated at the subcase level via different options (such as TEMP(MAT), TEMP(BOTH), DLOAD (via TLOAD1, TLOAD2 and TEMP/TEMPD Bulk Data Entries), etc.) depending on the subcase type.
  5. With TABLEM1 or TABLEG, the respective field on MAT1 will be replaced by the table data on MATT1. With TABLEM2/3/4, the respective field of MAT1 will be modified by the table data.
  6. 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.
  7. This card is represented as a material in HyperMesh.