3.2
GENERAL STRUCTURE DATA Z88I1.TXT
Mind the following formats:
[Long] = 4 bytes integer
number
[Double] = 8 bytes floating point number, alternatively with or without point
1st input group, i. e.
first line, contains:
Dimension of the
structure (2 or 3)
Number of nodes of the FEA structure
Number of elements
Number of degrees of freedom
Number of material information lines
Coordinate flag KFLAG (0 or 1)
Beam flag IBFLAG (0 or 1)
Plate flag IPFLAG (0 or 1
Write all numbers into a
line, separate at least by one blank respectively. All numbers here of the type
[Long].
Explanation KFLAG:
At input of 0 the
coordinates are expected cartesian while at input of 1 polar or cylindrical
coordinates are expected. The latter are then converted into cartesian
coordinates and thereupon stored in this form in Z88O0.TXT. Caution: The
axially symmetric elements No.6, 8 and 12 positively
expect cylindrical coordinates, set KFLAG to 0 here!
Explanation IBFLAG:
If Beams No.2 or Beams No.13 appear in the structure, then set
beam flag IBFLAG to 1, otherwise it must be 0.
Example: A three-dimensional structure of Hexahedrons
No.10 and Beams No.2 is supposed to have 10 elements. The
coordinates are entered in cylindrical coordinates, 3 material info lines, 270
degrees of freedom and 45 nodes. Thus : 3 45 10 270 3 1 1
Explanation IPFLAG:
If Plates No.18, No.19 or No.20 appear in the structure, then set plate flag
IPFLAG to 1, otherwise it must be 0.
Example: A two-dimensional structure of
Plates No.20 is supposed to have 100 elements. The coordinates are entered in
cylindrical coordinates, 2 material info lines, 540 degrees of freedom and 180
nodes. Thus : 2 180 100 540 2 1 0 1
Caution: This Z88
release allows only beams or plates in a structure, not both in the same
structure!
2nd input group,
starting with line 2, contains:
Coordinates, one line per
node.
Node number, strictly
ascending [Long]
Number of the degrees of freedom for this node [Long]
X-coordinate or, if KFLAG is 1, R- coordinate [Double]
Y-coordinate or, if KFLAG is 1, PHI-coordinate [Double]
Z-coordinate or, if KFLAG is 1, Z-coordinate [Double]
The Z coordinate can be dropped at 2-dimensionalen structures. Enter angles PHI in radian.
Write all numbers into a
line, separate at least by one blank respectively.
Example 1: The node no.156 has 2 degrees of
freedom and the coordinates X = 45.3 and Y = 89.7 . Thus : 156 2 45.3 89.7
Example 2: The node no.68 is supposed to have
6 degrees of freedom (a Beam No.2 is attached) and cylindrical coordinates R =
100. , PHI = 0.7854 (corresponds to 45 °), Z = 56.87. Thus
68 6 100. 0.7854 56.87
3rd input group, starting
after last node, contains:
Coincidence, two lines for
every finite element
1st line:
Element number, strictly
ascending
Element type (1 to 20)
Write all numbers into a
line, separate at least by one blank respectively. All numbers here of the type
[Long].
2nd line: Depending on
element type
1st node number for
coincidence
2nd node number for coincidence
.....
20th node number for coincidence
Write all numbers into a
line, separate at least by one blank respectively. All numbers here of the type
[Long].
Example: An Isoparametric Serendipity Plane
Stress Element No.7 has element number 23. The coincidence has the global nodes
14, 8, 17, 20, 38, 51, 55, 34 (locally these are the nodes 1-2-3-4-5-6-7-8, see
chapter
4.7) . Thus
resulting in two lines:
23 7
14 8 17 20 38 51 55 34
4th input group,
starting after last element, contains:
Material information, one
line for each material information.
This material
information line starts with element no. inclusively [Long]
This material information line ends with element no. inclusively [Long]
Youngs's Modulus [Double]
Poisson's Ratio [Double]
Integration order (0, 1, 2, 3, 4, 5, 7 or 13) [Long]
Cross section value QPARA [Double]
... And if beams (but
not plates !) are defined in addition:
Second
moment of inertia yy (bending around yy axis)
Max. distance from neutral axis yy
Second moment of inertia zz (bending around zz axis)
Max. distance from neutral axis zz
Second moment of area (torsion)
Second modulus (torsion)
... And if plates (but
not beams !) are defined in addition:
area load
Write all numbers into a
line, separate at least by one blank respectively.
Explanation cross
section value QPARA:
QPARA is element
type-dependent, e.g. for hexahedrons QPARA is 0, for trusses QPARA is the
cross-sectional area and for plane stress elements QPARA is the thickness. See chapter 4.
Example: The structure has 34 finite
elements No.7. The thicknesses is supposed to vary: Elements 1 to 11 thickness
10 mm, elements 12 to 28 15 mm and elements 29 to 34 now 18 mm. Material steel.
Integration order is supposed to be 2. Thus three material information lines:
1 |
1 |
11 |
206000 |
0.3 |
2 |
10. |
2 |
12 |
28 |
206000 |
0.3 |
2 |
15. |
3 |
29 |
34 |
206000 |
0.3 |
2 |
18. |