/PROP/TYPE32 (SPR

Block Format Keyword

/PROP/TYPE32 - Pretension Spring Property Set

Description

This property describes the pretension spring property set.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/PROP/TYPE32/prop_ID/unit_ID or /PROP/SPR_PRE/prop_ID/unit_ID
prop_title
M					sens_ID	Ilock
Stif0		F1		D1		E1		Stif1
fct_ID1	fct_ID2

Field	Contents	SI Unit Example
prop_ID	Property identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
prop_title	Property title (Character, maximum 100 characters)
M	Spring mass (Real)
sens_ID	Sensor identifier (Integer)
Ilock	Lock feature flag Default = 1 (Integer) = 1: old formulation = 2: new formulation (spring is locked after any unload of the spring).
Stif0	Spring stiffness before sensor activation and unloading stiffness after sensor activation (Real)
F1	Force at sensor activation (Real)
D1	Piston’s slide length (Real)
E1	Initial internal energy at sensor activation (Real)
Stif1	Loading stiffness after sensor activation (Real)
fct_ID1	Loading force function vs displacement after sensor activation (Integer)
fct_ID2	Loading force function vs time after sensor activation (Integer)

#RADIOSS STARTER

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#- 1. LOCAL_UNIT_SYSTEM:

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/UNIT/2

unit for prop

# MUNIT LUNIT TUNIT

kg m s

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/PROP/SPR_PRE/11/2

PRETENSIONER

# M sens_ID Ilock

.05 1 0

# Stif0 F1 D1 E1 Stif1

100000 0 .25 0 0

# fct_ID1 fct_ID2

1 0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/SENSOR/TIME/1

pretentioner

# Tdelay

0.1

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/1

Loading force function vs displacement after sensor activation

# X Y

-1 0

-.1 95

0 100

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#ENDDATA

1.	To define pretension elements, refer to option /SPRING.

If Ilock = 1, Stif0 is used:

•	as unloading stiffness before the end of the piston’s slide is reached;

•	as loading and unloading stiffness after the end of the piston’s slide is reached.

starter_prop_spr_pre

If Ilock = 2, Stif0 is used:

•	as unloading stiffness before the end of the piston’s slide is reached;

•	as loading stiffness after any unloading;

•	as loading and unloading stiffness after the end of the piston’s slide is reached.

starter_proptype32_Ilock2

If or , Stif0 is used:

•	as loading and unloading stiffness after the end of the piston’s slide is reached.

starter_prop_spr_pre

If and , Stif0 is used:

•	as loading and unloading stiffness after that D1 is reached.

starter_proptype32_D1

2.	Exactly two parameters among F1, D1, E1 and Stif1 must be defined. The other two parameters are computed from the following equations:

and

3.	The force is set to 0 at the end of the piston’s slide (D1).

4.	If fct_ID1 ≠ 0 or fct_ID2 ≠ 0, F1, E1 and Stif1 are ignored.

5.	If fct_ID1 ≠ 0 or fct_ID2 ≠ 0, the force is defined as:

Where, t0 is the time at sensor activation and x0 is the length at sensor activation.

With, , if fct_ID2 = 0 and , if fct_ID1 = 0.

6.	If , the piston is at the end of sliding (D1 is reached).

7.	If Ilock = 2, spring loading and unloading stiffness is equal to Stif0 (spring is locked), after the first unload of the spring (after sensor activation).

8.	Spring is locked once D1 is reached.

/PROP/TYPE32 (SPR_PRE)

/PROP/TYPE32 (SPR_PRE)

/PROP/TYPE32 (SPR_PRE)