Tutorial 3 :Create an LS-DYNA input deck for

an s-rail impacting a rigidwall

Case description:

S-Rail: shell elements, deformable material

Rigidwall: stationary, planar

S-Rail Initial Velocity: 10mm/ms

Files required:

channel.igs, flat.igs, spot.conf, welds.spot

Step 1: Import IGES geometry

1. File→Open→IGES File

2. open channel.igs

3. File→Import→IGES File

4. open flat.iges

5. click ShaGeo render button

Step 2: Mesh surfaces

1. FEM→Element and Mesh→Auto Mesher

2. enter element size 6

3. click visable in gen select panel

4. click Mesh

5. click Accept

6. click Done

Step 3: Define section properties

1. FEM→Model and Part→Keyword Manager

2. select All

3. select SECTION

4. select SHELL from the list

5. click Edit

6. click NewID in the KEYWORD INPUT popup form

7. enter TITLE: 1mm thick

8. enter T1=1

9. click Accept

10. click Done

Step 4: Define material

1. select MAT from the list

2. select 024-PIECEWISE_LINEAR_PLASTICITY from the list

3. click Edit

4. click NewID in the KEYWORD INPUT popup form

5. enter TITLE: mild steel

6. enter RO=7.83e-6

7. enter E=207

8. enter PR=0.3

9. enter SIGY=0.2

10. enter ETAN=2.0

11. click Accept

12. click Done

Step 5: Assign section properties and material

1. FEM→Model and Part→Part Data

2. select Assign

3. click All

4. click SECID in the bottom panel

5. click Done in Link SECTION Dialog

6. click MID in the bottom panel

7. click Done in Link MAT Dialog

8. click Assign Part: Apply

Step 6: Add masses

1. click Top render button

2. click Zoin to zoom in on right end of rail

3. FEM→Model and Part→Create Entity

4. select Mass

5. select Cre

6. enter Mass=2.0

7. select Area in gen select panel

8. draw box to select end layer of nodes

9. click Apply

Step 7: Add constraints

1. FEM→Model and Part→Create Entity

2. select SPC

3. select Cre

4. activate Y

5. activate Z

6. activate RX

7. activate RY

8. activate RZ

9. select Area in gen select panel (should already be selected)

10. draw box to select end layer of nodes

11. click Apply

Step 8: Apply initial velocity

1. select Velocity

2. select Create

3. enter Vx=-10

4. select Area in gen select panel

5. draw box to select end layer of nodes

6. click Apply

Step 9: Create planar rigidwall

1. select Rigidwall

2. select Create

3. select Planar

4. select any node from left end of tube in graphics window

5. click Apply

Step 10: Create welds using master weld file

1. FEM→Element and Mesh→Spot Welding

2. click Open

3. choose welds.spot (primer format, change file filter to *.spot if necessary)

4. select Properties: File

5. click Browse

6. choose spot.conf

7. click Create

8. click Accept

9. click Done

Step 11: Set d3plot frequency

1. FEM→Model and Part→Keyword Manager

2. select BINARY_D3PLOT from the list

3. click Edit

4. enter DT=1 in the KEYWORD INPUT popup form

5. click Accept

6. click Done

Step 12: Set ASCII time history outputs

1. select ASCII_option from the list

2. click Edit

3. enter Default DT=0.1 in the KEYWORD INPUT popup form

4. activate GLSTAT (global statistics)

5. activate MATSUM (material energy summary)

6. activate RWFORC (rigidwall force)

7. activate SWFORC (spotweld force)

8. click Accept

9. click Done

Step 13: Set termination time

1. select CONTROL

2. select TEMINATION from the list

3. click Edit

4. enter ENDTIM=10 in the KEYWORD INPUT popup form

5. click Accept

6. click Done

Step 14: Save the model

1. File → Save Keyword

2. enter Filename: myrail.k

3. click Save