/SECT/CIRCLE

Block Format Keyword

/SECT/CIRCLE - Sections

Description

A section is a set of nodes and a set of elements.

Those sets are built automatically, by intersecting the concerned groups of elements with a disc.

sect_circle

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/SECT/CIRCLE/sect_ID/unit_ID
sect_title
node_ID1	node_ID2	node_ID3		ISAVE
file_name
grbric_ID		grshel_ID	grtrus_ID	grbeam_ID	grsprg_ID	grtria_ID	Ninter		Iframe

Input read only if Ninter > 0

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
int_ID1	int_ID2	int_ID3	int_ID4	int_ID5	int_ID6	int_ID7	int_ID8	int_ID9	int_ID10

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
XM		YM		ZM
Dir_X		Dir_Y		Dir_Z
R

Field	Contents	SI Unit Example
sect_ID	Section identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
sect_title	Section title (Character, maximum 100 characters)
node_ID1	Node identifier N1 (Integer)
node_ID2	Node identifier N2 (Integer)
node_ID3	Node identifier N3 (Integer)
ISAVE	Saving the data flag (Integer) = 0: Do not save = 1: Displacements are saved in the file "file_name" = 2: 1 + forces are saved = 100: The data contained in the file "file_name" is read as input for the calculation = 101: 100 + forces are recomputed for the error calculation
	Time step for saving the data (Real)
	Coefficient for filtering ( < 1) (Real)
file_name	Root name of the file which contains the flag output. The extension for this file is nameSC01 (Character, maximum 100 characters)
grbric_ID	Brick group identifier (Integer)
grshel_ID	Shell group identifier (Integer)
grtrus_ID	Truss group identifier (Integer)
grbeam_ID	Beam group identifier (Integer)
grsprg_ID	Spring group identifier (Integer)
grtriag_ID	Triangle group identifier (Integer)
Ninter	Number of interfaces (Integer)
Iframe	Computing the skew center local skew is the skew flag defined by node_ID1, node_ID2, and node_ID3 (see figure in Comment 14) (Integer) The center C is given in the local skew: = 0: the origin of the local skew (C0) = 1: the geometrical center of the section (C1) = 2: the CoG of the section (C2) = 3: point o(0,0,0) is the center of the local skew The center C is given in the global skew: = 10: the origin of the global skew (C0) = 11: the geometrical center of the section (C1) = 12: the CoG of the section (C2) = 13: point o(0,0,0) is the center of the global skew
int_ID1, int_ID2, ..., int_IDn	Optional interface identifiers, if Ninter > 0 (Integer)
XM	X coordinate of center of the disc (Point M) (Real)
YM	Y coordinate of center of the disc (Point M) (Real)
ZM	Z coordinate of center of the disc (Point M) (Real)
Dir_X	X coordinate of normal vector to the disc (Real)
Dir_Y	Y coordinate of normal vector to the disc (Real)
Dir_Z	Z coordinate of normal vector to the disc (Real)
R	Radius of the disc (Real)

1.	Resulting forces and moments acting on these sections will be stored in the Time History file.

2.	You can save force and moment in an output file. This output could be used as input for another calculation.

3.	Nodes node_ID1 and node_ID2 define the local X-axis of the section. Nodes node_ID1, node_ID2 and node_ID3 define the local plane XY of the section.

4.	Vectors (Dir_X , Dir_Y, and Dir_Z) define the normal of the disk. Point M just defines the center of the disk and R defines the radius of the disk.

5.	Flag ISAVE is used for saving data in the SC01 file for the cut methodology.

It is recommended to set ISAVE =0 if no cut methodology is intended, since performance may be decreased and memory for RADIOSS Engine will be increased.

6.	If ISAVE = 1 or 2, data are saved in the file "file_nameSC01" at a frequency .

7.	If ISAVE = 100 or 101, displacements from file "file_nameSC01" are read as imposed displacements. The displacements are filtered according to the following relations:

y+ = x + (1-)y

with,

for filtering -3dB

for filtering -6dB

Where, T is the filtering period, in general, T = 10t.

Typical use .

8.	ISAVE = 101 allows the forces read in the file "file_nameSC01" and the forces computed in the calculation to be compared.

9.	Moments are computed with respect to the section center defined by the parameter Iframe (see figure in Comment 14) and expressed in the local section frame.

10.	Normal force is the component normal to the XY plane of the section. Tangential force is the component in the plane of the section.

In plot file FNX, FNY, FNZ, FTX, FTY, and FTZ are respectively the components of normal and tangential forces in the global frame (see figure below for the definition of the local frame).

11.	Moments calculation if Iframe = 0, 1, 2 or 3.

clip0125

12.	Moments calculation if Iframe = 10, 11, 12 or 13.

clip0126

13.	Forces and moments calculation.

clip0127

14.	Local reference frame (Ox and Oy):

clip0128

15.	The center C0 is given by the nodes: node_ID1, node_ID2 and node_ID3.

16.	The center C1 is the geometric center of the section nodes:

where, n = nodes.

17.	The center C2 is the center of gravity of the section nodes:

18.	The center C3 is the node with coordinates (0, 0, 0) in the global skew.

19.	The disc is used to define the set of elements and the set of nodes of the section.

The set of elements is created from the elements intersecting the disc. The set of nodes of the section is created from the nodes of those intersected elements, which are on the upside (Z > 0) of the plane of the disc.