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TABLEM1 |
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TABLEM1 |
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»Click here to display Table of Contents«
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TABLEM1 |
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TABLEM1 |
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Bulk Data Entry
TABLEM1 – Material Property Table, Form 1
Description
Defines a tabular function for use in generating temperature-dependent material properties.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
TABLEM1 |
TID |
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FLAT |
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x1 |
y1 |
x2 |
y2 |
x3 |
y3 |
-etc.- |
"ENDT" |
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Field |
Contents |
TID |
Table identification number. (Integer > 0) |
FLAT |
Specifies the handling method for y-values outside the specified range of x-values in the table. = 0: If an x-value input is outside the range of x-values specified on the Table, the corresponding y-value look up is performed using linear extrapolation from the two start or two end points. = 1: If an x-value input is outside the range of x-values specified on the Table, the corresponding y-value is equal to the start or end point, respectively. Default = 0 (0 or 1) |
xi, yi |
Tabular values. Any xi-yi pair may be ignored by placing 'SKIP' in either of the two fields. (Real) |
"ENDT" |
Flag indicating the end of the table. |
| 1. | xi must be in either ascending or descending order, but not both. |
| 2. | Discontinuities may be specified between any two points except the two start points or two end points. For example, in the figure below, discontinuities are allowed only between points x2 through x7. Also, if y is evaluated at a discontinuity, then the average value of y is used. In the figure, the value of y at x = x3 is y = (y3+y4)/2. |
| 3. | At least one continuation entry must be specified. |
| 4. | The end of the table is indicated by the existence of "ENDT" in either of the two fields following the last entry. An error is detected if any continuations follow the entry containing the end-of-table flag "ENDT". |
| 5. | For FLAT=0 (default), TABLEM1 uses the algorithm (see comment 6): |
y= yT(x)
Where, x is input to the table and y is returned. The table look-up is performed using linear interpolation within the table and linear extrapolation outside the table using the two start or end points (see figure). No warning messages are issued, if the table data is input incorrectly.
Example of table extrapolation and discontinuity
For FLAT=1, the same algorithm as FLAT=0 is used, except that values outside the range are not extrapolated. The corresponding start or end point y-values are used for all y-values outside the range.
| 6. | In a nonlinear heat transfer analysis, TABLEM1 uses the following algorithm: |
y = z [yT (x)]
Where, x is input to the table, y is returned, and z is the corresponding entity value (for example, conductivity) from the MAT4 entry. This TABLEM1 entry when referenced on the MATT4 entry specifies corresponding multipliers to generate the final material properties (y) for various x values.
| 7. | This card is represented as a loadcollector in HyperMesh. |
See Also:
