/TH/SPRING

Block Format Keyword

/TH/SPRING - Time History - Spring

Description

Describes the time history for springs.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/TH/SPRING/thgroup_ID
thgroup_name
var_ID1	var_ID2	var_ID3	var_ID4	var_ID5	var_ID6	var_ID7	var_ID8	var_ID9	var_ID10
elem_ID		elem_name

Field	Contents
thgroup_ID	TH group identifier (Integer, maximum 10 digits)
thgroup_name	TH group name (Character, maximum 100 characters)
var_ID1, ...n	Variables saved for TH (see table below) (Character, maximum 8 characters)
elem_ID	Element identifier (Integer)
elem_name	Name of the element to appear in the time history (Integer, maximum 80 characters)

Keyword	Object saved	Variables
SPRING	Springs	OFF, FX, FY, FZ, MX, MY, MZ, LX, LY, LZ, RX, RY, RZ, IE, F1, F2

Keyword	Variable Group	Saved TH Variables
SPRING	DEF	OFF, FX, FY, FZ, MX, MY, MZ, LX, LY, LZ, RX, RY, RZ, IE

•	OFF: element flag for deactivation (see Comment 4)

•	FX: force in direction X

•	FY: force in direction Y

•	FZ: force in direction Z

•	F1 and F2 (only available for /PROP/SPR_PUL) are internal forces of each spring force.

•	MX: moment in direction X

•	MY: moment in direction Y

•	MZ: moment in direction Z

•	LX: elongation in direction X

For springs 29, 30, 31, 32, 35, and 36, the output is elongation speed of the spring.

•	LY: elongation in direction Y

•	LZ: elongation in direction Z

•	RX: rotation around X axis in radians

•	RY: rotation around Y axis in radians

•	RZ: rotation around Z axis in radians

•	IE: internal energy

1.	Available names are listed in the two tables above.

In the first table, TH-variables are listed. If a TH-variable is requested, this variable is written.

In the second table, other variable groups are listed. If a variable group is requested, all the associated TH-variables are written at once.

2.	For springs TYPE4, TYPE13, TYPE32, and TYPE35, the forces and moments are given in the local element system. The element system is defined with the spring nodes and the local skew defined in the property.

3.	For the spring TYPE8, the forces and moments are given in the global system; except when a local skew is defined in the property. In this case, the forces and moments are given in the defined local system.

OFF:

0.0 deleted element
1.0 active element
2.0 (shells / solids): active element using small strain
Negative value -1/-2 when the element is on stand-by due to rigid body

Some intermediate values can be found during few cycles before element deletion (progressive reduction of off during a few cycles applies as a multiplicative factor to the stress, so that the stress is progressively vanished and element is deleted after ~ 10 cycles). This process applies to some element types, but not all.