Week - 5 - Modelling Spotwelds
AIM:
Run a crash box simulation using beam spot weld and solid hexa spotweld and compare the result (axial and shear force).
EXPLANATION:
- Modelling of spotweld is very important as it help to keep the sheet metal together.
- Material modelling and its failure method are very important parameter which needs to be considered while simulation.
- In LS-DYNA there are 4 method to model spot weld they are using beam elements and tied contact;solid hexa and contact spotweld.
PROCEDURE:
STEP 1:
Given model for modelling the spotweld.

STEP 2:
To create Beam spotweld-----Go to elem tool----edit element----create---beam type----proceed.

STEP 3:
Select the node plate.

BEAM_SPOTWELD HAS BEEN CRETAED.

STEP 4:
Go to create entity----rigid wall----create ---planar.

STEP 5:
Create set ID-----SET NODE/SET PART/SET SHELL.



STEP 6:
Create MAT------PIECEWISE_LINEAR_PLASTICITY-----FOR STEEL.

STEP 7:
Create-----MAT-----SPOTWELD---STEEL

RIGID WALLL -----PLANAR

SECTION----BEAM-----ELFORM 9 to be created.

SECTION-----SHELL-----FOR PLATES

CONTACT-----TIED_SHELL_EDGES_TO SURFACE----cretaed.

INITIAL VELOCITY----9.8m/s to be created.

STEP 8:
Go to LS-RUN------run the simulation.


STEP 9:
BEAM_SPOT WELD hs been created-------simulation has been done.

STRESS----X-stress----ASCii

ASCII-----STRESS-----Y STRESS---simulation.

ANIMATION OF FINAL SIMULATION OF BEAM SPOT WELD

STEP 10:
Created hexa solid spot weld-----delete the beam spot weld.

SOLID_HEXA SPOT WELD

For solid spot weld section _solid need to create

CONTACT---- SPOT WELD need to be created.

STEP 11:
Final animated of solid spot weld.

STEP 12:
Go to ASCII-----load----axial force ----for solid spot_weld.
ASCII------shear force-----for solid spot weld

STEP 13:
ASCII-----beam ---spotweld-----axial force
ASCII-----BEAM---SPOTWELD-----SHEAR FORCE

STEP 14:
Total /internal /kinetic energy of GLSTAT -------------solid spotweld

ENERGY----- HOURGLASS----GLSTAT

SLIDING ENERGY

STEP 15:
BEAM SPOTWELD
Total----kinetic----internal energy

HOURGLASS ENERGY


STEP 16:
Aceerlation of nodal point----solid spotweld.

Accerlation of nodal point-----beam spotweld.
STEP 17:
Maximum directional stress and strain along the length of the crashbox (X strain, Y strain )
BEAM SPOTWELD

SOLID SPOTWELD
STEP 18:
Secforce of beam spotweld

Secforce of solid spotweld.
RESULT:
CASE 1:
The relevant the beam spotweld----with the simulation


CASE 2:
The solid spot weld with the simulation

