Finite Element Analysis (FEA) Tutorial Project: Impact Loading using the Johnson-Cook Plasticity-Damage Model
Problem •
Analyze the impact loading of an object on aluminum plates using FEA tool ABAQUS
Plate Dimensions: t= 26.3 mm w=304 mm L= 304 mm
Projectile Dimensions: d= 12.9 mm lp= 88.9 mm lp L=304 mm
• •
Determine: Plot
d t= 26.3 mm
Problem •
Analyze the impact loading of an object on aluminum plates using FEA tool ABAQUS
Plate Dimensions: t= 26.3 mm w=304 mm L= 304 mm
Projectile Dimensions: d= 12.9 mm lp= 88.9 mm lp L=304 mm
• •
Determine: Plot
d t= 26.3 mm
Preprocessing
Creating The Geometry •
Open ABAQUS/CAE and create a new parts: –
Aluminum Plate
–
Projectile
Creating The Geometry •
Aluminum Plate
Creating The Geometry •
Projectile
Material Properties •
Aluminum Plate and Projectile Model Part
Young Modulus (MPa)
Poisson Ratio
Density (Tonne/mm^3)
Aluminum Plate
69000
0.35
2.7E-009
Projectile
202000
0.3
8.6E-009
Material Properties •
Aluminum Plate and Projectile Plastic Data Johnson-Cook Plasticity
A [Mpa]
B [Mpa]
n
m
C
Aluminum Plate
262
162.1
0.2783
1.34
-
-
Projectile
1430
2545
0.7
1.03
0.014
15.0
ε0 [1/s]
Material Properties •
Aluminum Plate Johnson-Cook Dynamic Failure Model
Material
d1
d2
d3
d4
d5
Melting Temperature (°C)
Transition Temperature (°C)
Reference Strain Rate 1/s
Aluminum Plate
-0.77
1.45
0.47
0
1.6
651.85
20.05
1
1
ABAQUS Material Definition 4
3
5
2
ABAQUS Material Definition •
•
Add Damage Evolution
Set the displacement at failure to 0.9
Creating an Assembly •
•
Double click on instances
Set the projectile 100 mm from the origin (center of the plate )
Interactions properties •
Double click in interaction properties, select contact. Select Mechanical, Normal Behavior
Interaction properties continued •
Select the default set and click OK
Interactions •
Double click on Interactions, General Contact, All with self and add the created IntProp-1 in individual property assignment
Creating Mesh (partitioning) Aluminum Plate •
Create a Partition of the plate
•
Seed edges and select the partition lines
Creating Mesh (Continued)
•
Repeat the procedure in the opposite directions for the rest of the internal lines
Creating Mesh
Creating Mesh Projectile •
Create a Partition of the projectile
•
Select an the approximate global size
Creating Mesh •
From Mesh Element Type Select Element Deletion for the Plate and the projectile
Creating a Step •
•
Double click Steps under Model tree and Create step window will pop up This time you will modify the time period
Field Output Request •
Select SDEG scalar Stiffness degradation and Status as output variables
Boundary Conditions
Results with v3 =-700000 and displacement at failure 0.9 Time t0
Time t2
Time t1
Time t3
Results Time t4
Time t6
Time t5
Time t7
Results Time t8
Time t10
Time t9
Time t11
Results
Rebound of the projectile •
•
Change the value of predefined velocity field Delete the damage evolution in Materials Aluminum Plate
Boundary Conditions
Delete the Damage Evolution
Results Time t0
Time t2
Conduct simulations •
•
•
Change the values of displacements at failure from 0.1 to 0.9 and keep damage evolution. Comment on the results for Von Mises stress, the morphology of the plate and the hole, the trajectory of the projectile and the velocity Improve the model using your favorite meshing technique to refine the center of the plate or reduce the geometry to the half or a quarter.