Radioss Crash Seat Presentation v02

8/2/2019 Radioss Crash Seat Presentation v02

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Altair Engineering, Inc.Innovation Intelligence

RADIOSS V4

Seat Modeling For Crash Application V02


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Copyright 2006 Altair Engineering, Inc. All rights reserved. 2

Target :

The target of this document is to review in detail all necessary RADIOSS options needed to set in the

model in order to perform a seat model analysis. In this example, a front impact sled test is modeled.

Summary :

The different chapters are :

Page Seat meshing 03

Model assembling 07

Materials and properties 09

Connections 15

Dummy setting 16 Loadcase 22

Engine file 25

Result analysis 26

Abstract


3/30


Seat Mesh :

The seat is meshed with 4 nodes and 3 nodes thin shell elements. The feet of the seat are modeled with

beam elements. The beams are connected to the shell elements with common nodes. These elementsare set into parts which are linked to isotropic material and property.

Model building

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

/PART/1/Seat plate

1 1

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

# Id N1 N2 N3 N4 Thick

1 48 1693 1692 1696 0

2 1181 1694 1692 1693 0

3 1447 1695 1692 1694 0

4 788 1696 1692 1695 0

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

3 3

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

/BEAM/3

# Id N1 N2 N3

12371 531 4 96

12372 2 529 55

12373 3 530 7112374 1 528 92

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

/PART/1/Seat plate

1 1

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

/SHELL/1

# Id N1 N2 N3 N4 Thick

1 48 1693 1692 1696 0

2 1181 1694 1692 1693 0

3 1447 1695 1692 1694 0

4 788 1696 1692 1695 0

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

/PART/3/Feet

3 3

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

/BEAM/3

# Id N1 N2 N3

12371 531 4 96

12372 2 529 55

12373 3 530 7112374 1 528 92


4/30


Seat Mesh :

The material for the shell elements is an elasto-plastic one with Johnson-Cooks formulation and damage

(maximum stress). The shell formulation, thickness, number of integration points are defined in the shellproperty cards.

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

/MAT/PLAS_JOHNS/1/STEEL

# Init. dens. Ref. dens.

7.9e-009 0# E Nu

210000 0.3

# a b n Eps_max sigma_max

200 450 0.5 1e+030 425

# c Eps_0 Icc Fsmooth FCUT

0 0 0 0 0

# m T_melt rhoCp T_i

0 0 0 0#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

/PROP/SHELL/1/Shell

# Ishell Ismstr

24 0

# hm hf hr dm dn

0 0 0 0 0

# N Istrain Thick Ashear Ithick Iplas

5 0 1.5 0 0 0#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

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



7.9e-009 0

# E Nu210000 0.3

# a b n Eps_max sigma_max

200 450 0.5 1e+030 425


0 0 0 0 0


0 0 0 0

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

/PROP/SHELL/1/Shell

# Ishell Ismstr

24 0

# hm hf hr dm dn

0 0 0 0 0


5 0 1.5 0 0 0

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

Model building


5/30Copyright 2006 Altair Engineering, Inc. All rights reserved. 5

Seat Mesh :

The material for the feet is the same as the previous one. The beam area, inertias and released DOFare defined in the beam property cards.

Model building

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



7.9e-009 0

# E Nu

210000 0.3# a b n Eps_max sigma_max

200 450 0.5 1e+030 425


0 0 0 0 0


0 0 0 0

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

/PROP/BEAM/3/BEAM# Ismstr

0

# dm df

0 0

# Area Iyy Izz Ixx

130 15000 15000 30000

# Rot Ishear

000 000 0#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

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



7.9e-009 0

# E Nu

210000 0.3

# a b n Eps_max sigma_max200 450 0.5 1e+030 425


0 0 0 0 0


0 0 0 0

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

/PROP/BEAM/3/BEAM

# Ismstr

0

# dm df

0 0

# Area Iyy Izz Ixx

130 15000 15000 30000

# Rot Ishear

000 000 0

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



Seat Mesh :

The backseat structure is linked to the seat itself with two rigid bodies.

The rigid bodies are defined with a set of slave nodes. The parameters are the default ones. The rigidbody is set to the time history.

Model building

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

/RBODY/1/Recliner# RBID ISENS NSKEW ISPHER MASS Gnod_id IKREM ICOG Surf_id

12109 0 0 0 0 1 0 0 0

# Jxx Jyy Jzz

0 0 0

# Jxy Jyz Jxz

0 0 0

/GRNOD/NODE/1/RBODY_group_369_of_NODE

1 110 211 514 532 598 880 887 1608 1619

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

/TH/RBODY/2/Rigid body

# var1 var2 var3 var4 var5 var6 var7 var8 var9 var10

DEF

# Obj1 Obj2 Obj3 Obj4 Obj5 Obj6 Obj7 Obj8 Obj9 Obj10

1 2

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

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

/RBODY/1/Recliner

# RBID ISENS NSKEW ISPHER MASS Gnod_id IKREM ICOG Surf_id

12109 0 0 0 0 1 0 0 0

# Jxx Jyy Jzz

0 0 0

# Jxy Jyz Jxz

0 0 0

/GRNOD/NODE/1/RBODY_group_369_of_NODE

1 110 211 514 532 598 880 887 1608 1619

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

/TH/RBODY/2/Rigid body

# var1 var2 var3 var4 var5 var6 var7 var8 var9 var10

DEF

# Obj1 Obj2 Obj3 Obj4 Obj5 Obj6 Obj7 Obj8 Obj9 Obj10

1 2

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



Model assembling :

On the seat structure, the floor, the seat belt anchorage points and the foam blocks are added.

Model building

Tree hierarchy



Model building

Model assembling :

A self impact interface is defined with all the shell element parts. This interface is defined with friction andvariable gap (gap defined according the part thickness).

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

/INTER/TYPE7/300003/All self impact

#Slav_id Mast_id Istf Igap Multi Ibag Idel

300023 300022 0 1 0 0 0# STFAC FRIC GAP Tstart Tstop

0 0.2 0 0 0

# I_BC INACTI VIS_S VIS_F BUMULT

000 0 0 0 0

# Ifric Ifiltr Xfreq Iform

0 0 0 0

/GRNOD/SURF/300023/INTER_group_300023_of_SURF

300022/SURF/PART/300022/INTER_group_300022_of_PART

1 2 4 5 100001 300003 300004

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

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

/INTER/TYPE7/300003/All self impact


300023 300022 0 1 0 0 0

# STFAC FRIC GAP Tstart Tstop

0 0.2 0 0 0


000 0 0 0 0


0 0 0 0

/GRNOD/SURF/300023/INTER_group_300023_of_SURF

300022/SURF/PART/300022/INTER_group_300022_of_PART

1 2 4 5 100001 300003 300004

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



Materials and properties :

The seat foam is defined with isotropic solid elements, HSEPH formulation and linked to a visco-elasticmaterial. A curve (stress vs strain) defines the material behavior.

Model building

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

/MAT/FOAM_PLAS/300001/Foam


1e-009 0

# E Ka If

15 0 300001

# P0 Phi Gamma_00 0 0

# A B C

0 0 0

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

/FUNCT/300001/Foam

# X Y

-0.75 1.1

0 0

1 0.017

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

/PROP/SOLID/300001/Foam

# Isolid Ismstr Iplas Icpre Icstr dn

104 0 0 0 0 0

# q_a q_b h

0 0 0

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

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

/MAT/FOAM_PLAS/300001/Foam


1e-009 0

# E Ka If

15 0 300001

# P0 Phi Gamma_0

0 0 0

# A B C

0 0 0

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

/FUNCT/300001/Foam

# X Y

-0.75 1.1

0 0

1 0.017

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

/PROP/SOLID/300001/Foam

# Isolid Ismstr Iplas Icpre Icstr dn

104 0 0 0 0 0

# q_a q_b h

0 0 0#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

0

0.2

0.4

0.6

0.8

1

1.2

-1 -0.5 0 0.5 1

Strain

Stress

0

0.2

0.4

0.6

0.8

1

1.2

-1 -0.5 0 0.5 1

Strain

Stres

s




The seat cushions are modeled with orthotropic thick shell elements and linked to the fabric material.

Model building

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

/MAT/FABRI/300002/Fabric


2e-009 0

# E_11 E_22 Nu_12

2000 2000 0.2# G_12 G_23 G_31

500 500 500

# Re

0.001

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

/PROP/SH_ORTH/300002/Fabric

# Ishell Ismstr

24 0# hm hf hr dm dn

0 0 0 0 0


1 0 0.7 0 0 0

# Vx Vy Vz Phi

1 1 1 0

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

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

/MAT/FABRI/300002/Fabric


2e-009 0

# E_11 E_22 Nu_12

2000 2000 0.2

# G_12 G_23 G_31

500 500 500

# Re

0.001

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

/PROP/SH_ORTH/300002/Fabric

# Ishell Ismstr

24 0

# hm hf hr dm dn

0 0 0 0 0


1 0 0.7 0 0 0

# Vx Vy Vz Phi

1 1 1 0

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




The seat belt will be modeled both with 1D elements and shell elements.The shell elements will be set in front of the dummy in order to managecorrectly the contact and the forces. This 2D meshed seatbelt is linked tothe car (floor) using 1D elements :

truss (bar)

Load limiter (spring)

Pretentioner (spring)

Slip-ring (pulley type spring)

The stiffness of the truss elements used in this model is defined with anelasto-plastic material (same as the beam elements) and an area set inthe property.

Model building

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

/PROP/TRUSS/200001/Wire

# Area Gap

50 0

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

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

/PROP/TRUSS/200001/Wire

# Area Gap

50 0

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

Slip-ring

Load limiter

Pretentioner

Truss




The load limiter is defined with a spring element and a spring type property :

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

/PART/200003/Limiter

200003 0 200005

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

/SPRING/200003

# Id N1 N2 N3

200005 200009 200010 0#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

/PROP/SPRING/200003/Load limiter

# Mass Isensor Isflag Ileng

1e-005 0 0 0

# K C A B D

10000 0 0 0 0

# N1 H N2 N3 delta_min delta_max

200001 2 0 0 0 0#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

/FUNCT/200001/Load limitor

# X Y

-100 0

0 0

0.6 6000

100 6000

101 16000#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---

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

/PART/200003/Limiter

200003 0 200005

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

/SPRING/200003

# Id N1 N2 N3

200005 200009 200010 0

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

/PROP/SPRING/200003/Load limiter

# Mass Isensor Isflag Ileng

1e-005 0 0 0

# K C A B D

10000 0 0 0 0

# N1 H N2 N3 delta_min delta_max

200001 2 0 0 0 0

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

/FUNCT/200001/Load limitor

# X Y

-100 0

0 0

0.6 6000

100 6000

101 16000

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

0

5000

10000

15000

20000

-100 -50 0 50 100Displacement

Force

Model building




The pretentioner is defined with a spring element and a pretentioner typeproperty which is activated by a sensor.

Pretentioner

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

/PROP/SPR_PRE/200004/Pretensioner

# spring-mass Sensor

1e-005 200001

# Stif0 F1 D1 E1 Stif1

10000 0 0 0 0

# Ifunc1 Ifunc2

200002 0

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

/SENSOR/TIME/200001/TIME Sensor

# Tdelay

0.01

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

/FUNCT/200002/Pretensionner

# X Y

-121 -10000

-120 0

-50 2500

0 3000

1 10000

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

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

/PROP/SPR_PRE/200004/Pretensioner

# spring-mass Sensor

1e-005 200001

# Stif0 F1 D1 E1 Stif1

10000 0 0 0 0# Ifunc1 Ifunc2

200002 0

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

/SENSOR/TIME/200001/TIME Sensor

# Tdelay

0.01

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

/FUNCT/200002/Pretensionner# X Y

-121 -10000

-120 0

-50 2500

0 3000

1 10000

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

Model building

-10000

-5000

0

5000

10000

-150 -100 -50 0

Displacement

Force


14/30



The slip-ring is defined with a 3 nodes spring element and a pulley typeproperty.

The spring will slide around the second node of the spring.

Slip-ring

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

/PART/200002/Belt pulley

200002 0 200005

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

/SPRING/200002

# Id N1 N2 N3

200003 200006 200008 200004

200004 200007 100568 200010

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

/PROP/SPR_PUL/200002/Belt pulley

# Mass Isensor Isflag Ileng Fric

1e-005 0 0 0 0

# K C A B D

10000 0 0 0 0

# N1 H N2 delta_min delta_max

0 0 0 0 0

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

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

/PART/200002/Belt pulley

200002 0 200005#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

/SPRING/200002

# Id N1 N2 N3

200003 200006 200008 200004

200004 200007 100568 200010

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

/PROP/SPR_PUL/200002/Belt pulley

# Mass Isensor Isflag Ileng Fric1e-005 0 0 0 0

# K C A B D

10000 0 0 0 0

# N1 H N2 delta_min delta_max

0 0 0 0 0

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

Model building


15/30


Connections:

The seat feet and the seat belts are merged (redarrows) to the floor and included in the floor rigidbody.

The cushions are connected to the seatstructure with tied interfaces in order to modelthe (strong) glue.

Model building

/INTER/TYPE2/300002/Seat - Cushion

#Slav_id Surf_id Spotflag Level Isearch Dsearch

300010 300011 0 0 0 0 0

/GRNOD/NODE/300010/INTER_group_300010_of_NODE

300001 300002 300003 300004 300005 300006 300007 300008 300009 300010

/SURF/SURF/300011/INTER_group_300011_of_SURF

300012 300014

/SURF/GRSHEL/300012/INTER_group_300012_of_GRSHEL

300013

/GRSHEL/SHEL/300013/INTER_group_300013_of_SHELL4N

181 182 183 184 185 186 187 188 189 190

/SURF/PART/300014/INTER_group_300014_of_PART1 2

/INTER/TYPE2/300002/Seat - Cushion

#Slav_id Surf_id Spotflag Level Isearch Dsearch

300010 300011 0 0 0 0 0

/GRNOD/NODE/300010/INTER_group_300010_of_NODE

300001 300002 300003 300004 300005 300006 300007 300008 300009 300010

/SURF/SURF/300011/INTER_group_300011_of_SURF

300012 300014

/SURF/GRSHEL/300012/INTER_group_300012_of_GRSHEL

300013

/GRSHEL/SHEL/300013/INTER_group_300013_of_SHELL4N

181 182 183 184 185 186 187 188 189 190

/SURF/PART/300014/INTER_group_300014_of_PART

1 2

Rigid body

Tied interface


16/30


Dummy setting :

The dummy is added in the model using the safety position tools. When thedifferent parts of the dummy model is moved, the joint stiffnesses have to be also

updated.

The dummy is set on its right position even if there is intersection with the seatcushion. This intersection is removed with the seat deformer of HyperCrash or themorphing tool of HyperMesh.

Model building


17/30


Meshed belt creation :

From the 1D elements of the seat belt and the positioned dummy, the shellmeshed seatbelt is created. The shell meshed seatbelt is defined with fabricmaterial and orthotropic membrane property.

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

/MAT/FABRI/500002/Seat belt


3e-009 0

# E_11 E_22 Nu_12

10000 10000 0.1

# G_12 G_23 G_31

5000 5000 5000

# Re

0.001

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

/PROP/SH_ORTH/500195/Belt

# Ishell Ismstr

24 0

# hm hf hr dm dn

0 0 0 0 0


1 0 1.2 0 0 0

# Vx Vy Vz Phi

0 0 0 0

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

Model building

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

/MAT/FABRI/500002/Seat belt


3e-009 0

# E_11 E_22 Nu_1210000 10000 0.1

# G_12 G_23 G_31

5000 5000 5000

# Re

0.001

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

/PROP/SH_ORTH/500195/Belt

# Ishell Ismstr24 0

# hm hf hr dm dn

0 0 0 0 0


1 0 1.2 0 0 0

# Vx Vy Vz Phi

0 0 0 0

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


18/30


Meshed belt creation :

The shell meshed seatbelt is connected to 1D elements thru rigid bodies (4).

Model building


19/30


Contact interfaces :

A contact interface between the dummy and the outside surface of the cushion isdefined.

Because the dummy is defined as rigid body, it should only be defined as mastersurface in the interface. In the other case, the friction will be not correctly computed.The gap of this interface is bigger than the reality in order to have a smooth contactforce during the computation and a good sliding behavior.

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

/INTER/TYPE7/300006/Seat - Dummy


500210 500211 0 0 0 0 0


0 0.3 3 0 0


000 0 0 0 0


0 0 0 2

/GRNOD/PART/500210/INTER_group_500210_of_PART

300003 300004


500001 500002 500003 500004 500005 500006 500007 500008 500009 500010

500011 500013 500014 500015 500016 500017

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

Model building

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

/INTER/TYPE7/300006/Seat - Dummy


500210 500211 0 0 0 0 0


0 0.3 3 0 0

# I_BC INACTI VIS_S VIS_F BUMULT000 0 0 0 0


0 0 0 2


300003 300004


500001 500002 500003 500004 500005 500006 500007 500008 500009 500010

500011 500013 500014 500015 500016 500017#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|


20/30



Contact interface between the dummy and the seatbelt is also defined.

Because the dummy is defined as rigid body, it should only be defined asmaster surface in the interface. In the other case, the friction will be notcorrectly computed. The gap of this interface is bigger than the reality inorder to have a smooth contact force during the computation and a goodsliding behavior.

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

/INTER/TYPE7/300004/BELT ID 500038


500208 300023 0 0 0 0 0


0 0.5 5 0 0


000 0 0 0 0


0 0 0 0

/GRNOD/PART/500208/BELT ID 500038

500038

/SURF/PART/300023/BELT ID 500038

500001 500002 500003 500004 500005 500006 500010 500016

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

Model building

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

/INTER/TYPE7/300004/BELT ID 500038


500208 300023 0 0 0 0 0


0 0.5 5 0 0

# I_BC INACTI VIS_S VIS_F BUMULT000 0 0 0 0


0 0 0 0

/GRNOD/PART/500208/BELT ID 500038

500038

/SURF/PART/300023/BELT ID 500038

500001 500002 500003 500004 500005 500006 500010 500016

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

Upper belt

Lower belt

M d l b ildi


21/30



A contact interface between the dummy and the floor is alsodefined.

In order to take into account the friction (infinite one) between thefloor and the dummy, both defined as rigid bodies, a contact tiedtype interface with possible rebound is used.

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

/INTER/TYPE10/300007/Floor - dummy

#Slav_id Mast_id Multimp

500212 500213 0

# STFAC GAP Tstart Tstop0 2 0 0

# I_tied INACTI VIS_S BUMULT

0 0 0 0


500012 500018


100001

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

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

/INTER/TYPE10/300007/Floor - dummy

#Slav_id Mast_id Multimp

500212 500213 0

# STFAC GAP Tstart Tstop

0 2 0 0

# I_tied INACTI VIS_S BUMULT

0 0 0 0


500012 500018


100001

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

Model building

M d l b ildi


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Loadcase :

On the full model, an initial velocity is applied to the global X direction.

The initial velocity has to be applied to any node of the model.

Model building

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

/INIVEL/TRA/1/All

# Vx Vy Vz Gnod_id Skew_id

-13000 0 0 500227 0

/GRNOD/GRNOD/500227/INIVEL_group_500225_of_GRNOD

500226 500225

/GRNOD/NODE/500226/INIVEL_group_500226_of_NODE

12109 12110 100569 300677 300678 300679 300680 300681 300682 300683

300684 300685 300686 300687 300688 300689 300690 300691 300692 300693

GRNOD/PART/500225/INIVEL_group_500227_of_PART

1 2 3 4 5 100001 100002 200001 200002 200003

200004 300001 300002 300003 300004 500002 500004 500011 500017 500019

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

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

/INIVEL/TRA/1/All

# Vx Vy Vz Gnod_id Skew_id

-13000 0 0 500227 0

/GRNOD/GRNOD/500227/INIVEL_group_500225_of_GRNOD

500226 500225

/GRNOD/NODE/500226/INIVEL_group_500226_of_NODE

12109 12110 100569 300677 300678 300679 300680 300681 300682 300683300684 300685 300686 300687 300688 300689 300690 300691 300692 300693

GRNOD/PART/500225/INIVEL_group_500227_of_PART

1 2 3 4 5 100001 100002 200001 200002 200003

200004 300001 300002 300003 300004 500002 500004 500011 500017 500019

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

Model building


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Loadcase :

On the floor, an imposed velocity (global X direction) is set on the master node of the rigid body in orderto reproduce the car deceleration during the crash.

The other degrees of freedom of the floor rigid body master node are clamped.

Model building

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

/IMPVEL/100001/Imposed velocity

# Ifunct DIR Iskew Isensor Gnod_id Iframe

100001 X 0 0 100004 0# Scale Tstart Tstop

-1 0 0

/GRNOD/NODE/100004/IMPVEL_group_371_of_NODE

100569

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

/FUNCT/100001/Imposed velocity

# X Y

0 100000.05 8000

0.1 0

0.2 0

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

/BCS/100001/Floor

011 111 0 100001

/GRNOD/NODE/100001/BCS_group_342_of_NODE

100569

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

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

/IMPVEL/100001/Imposed velocity

# Ifunct DIR Iskew Isensor Gnod_id Iframe

100001 X 0 0 100004 0

# Scale Tstart Tstop

-1 0 0

/GRNOD/NODE/100004/IMPVEL_group_371_of_NODE

100569

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

/FUNCT/100001/Imposed velocity

# X Y

0 100000.05 8000

0.1 0

0.2 0

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

/BCS/100001/Floor

011 111 0 100001

/GRNOD/NODE/100001/BCS_group_342_of_NODE

100569#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|

0

2000

4000

6000

8000

10000

12000

0 0.05 0.1 0.15 0.2Time

Velocity

Model building


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Time History data :

In order to analyze the model results, the following items are set in the time history data :

All interfaces

Rigid body master node

of the floor

Rigid body of the floor

All parts

The time history data of the dummy (nodes, springs, accelerometer, rigid bodies) are already defined in

the model.

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

/TH/NODE/500001/H350MEF2D00_th_nodes

DEF

505197 0Feet left

505196 0Feet right

/TH/SPRING/500002/TH Spring selection

DEF

506026 Chest_def

/TH/ACCEL/500003/Accelerometers

DEF

500001 500002 500003

/TH/INTER/500004/TH INTER

DEF

300001 300002 300003 300004 300005 300006 300007

/TH/RBODY/500005/Floor

DEF100001

/TH/PART/500007/All

DEF

1 2 3 4 5 100001 100002 200001 200002 200003

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

Model building

#--1---|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|/TH/NODE/500001/H350MEF2D00_th_nodes

DEF

505197 0Feet left

505196 0Feet right

/TH/SPRING/500002/TH Spring selection

DEF

506026 Chest_def

/TH/ACCEL/500003/Accelerometers

DEF

500001 500002 500003

/TH/INTER/500004/TH INTER

DEF

300001 300002 300003 300004 300005 300006 300007

/TH/RBODY/500005/Floor

DEF

100001/TH/PART/500007/All

DEF

1 2 3 4 5 100001 100002 200001 200002 200003

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

Model building


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Model building

Engine file :

Engine file contains all necessary information in order tocompute the model.

Example :

#

/TITLE

/VERS/44

#

/DT/NODA/CST

6.700000e-001 5.000000e-007

#

/DT/SHELL/DEL

0.000000e+000 1.000000e-009

#/RUN/MODEL_00/1

1.000100e-001

/TFILE

1.000000e-004

/PRINT/100

#

/ANIM/DT

0.000000e+000 5.000000e-003/ANIM/ELEM/EPSP

/ANIM/ELEM/HOURG

/ANIM/ELEM/VONM

/ANIM/ELEM/ENER

/ANIM/NODA/DMAS

/ANIM/MASS

#

/PARITH/ON

/MON/ON

#

/TITLE

/VERS/44

#

/DT/NODA/CST

6.700000e-001 5.000000e-007

#

/DT/SHELL/DEL

0.000000e+000 1.000000e-009

#

/RUN/MODEL_00/1

1.000100e-001

/TFILE

1.000000e-004

/PRINT/100

#

/ANIM/DT

0.000000e+000 5.000000e-003/ANIM/ELEM/EPSP

/ANIM/ELEM/HOURG

/ANIM/ELEM/VONM

/ANIM/ELEM/ENER

/ANIM/NODA/DMAS

/ANIM/MASS

#

/PARITH/ON/MON/ON

Time step control

Deletion of dummy shell elements

Time computation control

Animation file control

Model results


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Listing file :

The starter listing file (_0000.lis),shows the RADIOSS analysis of the starter input

deck. .In this file all WARNINGS and ERRORShave to be checked and corrected.

The total mass, the mass for each part and the timestep need also to be checked.

NODAL TIME STEP (estimation)

---------------

TIME STEP NODE NUMBER

8.5352478114788E-07 5097281.1070707124365E-06 509729

1.2333282705249E-06 5370

1.2333282705249E-06 2628

1.2333282705249E-06 2997

1.2333282705249E-06 2590

1.2333282705249E-06 5423

1.2333282705249E-06 2610

Model results

NODAL TIME STEP (estimation)

---------------

TIME STEP NODE NUMBER

8.5352478114788E-07 5097281.1070707124365E-06 509729

1.2333282705249E-06 5370

1.2333282705249E-06 2628

1.2333282705249E-06 2997

1.2333282705249E-06 2590

1.2333282705249E-06 5423

1.2333282705249E-06 2610

TERMINATION WITH WARNING

------------------------

0 ERROR(S)

213 WARNING(S)

TERMINATION WITH WARNING

------------------------

0 ERROR(S)

213 WARNING(S)

WARNING id : 432

** WARNING IN SPRING ELEMENT

INERTIA ( = 1) OF SPRING ELT 506011,

SEEMS TO BE INCONSISTENT WITH MASS AND LENGTH

( REFERENCE INERTIA = Mass*Length^2 = 2.08001e-16 )

WARNING id : 432

** WARNING IN SPRING ELEMENT

INERTIA ( = 1) OF SPRING ELT 506011,

SEEMS TO BE INCONSISTENT WITH MASS AND LENGTH

( REFERENCE INERTIA = Mass*Length^2 = 2.08001e-16 )

WARNING id : 430

** WARNING IN SHELL 4N ELEMENT

SHELL With ID 500031 is a 4 Nodes degenerated Shell Element.

PLEASE USE A SHELL3N FOR BETTER RESULTS

WARNING id : 430

** WARNING IN SHELL 4N ELEMENT

SHELL With ID 500031 is a 4 Nodes degenerated Shell Element.

PLEASE USE A SHELL3N FOR BETTER RESULTS


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Model results


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Animation file :

With the animation files (A001 to A021) the motion and model deformationsare available.

Before crash After crash

Model results


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Time history file :

With the time history files (T01), 2D plots can be defined in order to check :

Global energies in the model

Mass and mass increase

Dummy parameters and criteria's : HIC, chest deflection, acceleration, upper leg forces,

Seat belt contact forces,

Global energy Dummy acceleration


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Altair Engineering, Inc.Innovation Intelligence

Contact : [email protected]
mailto:[email protected]:[email protected]

Radioss Crash Seat Presentation v02

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Transcript of Radioss Crash Seat Presentation v02