plate impact based on johnson cook parameters
TRANSCRIPT
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 1/33
Finite Element Analysis (FEA)
TutorialProject: Impact Loading using the
Johnson-Cook Plasticity-DamageModel
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 2/33
Problem
• Analyze the impact loading of an object onaluminum plates using FEA tool ABAQUS
t= 26.3 mm
L=304 mm
• Determine:• Plot
Plate Dimensions:t= 26.3 mmw=304 mmL= 304 mm
Projectile Dimensions:d= 12.9 mmlp= 88.9 mm
lp
d
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 3/33
Preprocessing
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 4/33
Creating The Geometry
• Open ABAQUS/CAE and create a new parts: – Aluminum Plate – Projectile
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 5/33
Creating The Geometry
• Aluminum Plate
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 6/33
•
Projectile
Creating The Geometry
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 7/33
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
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 8/33
Material Properties
• Aluminum Plate and Projectile Plastic Data
Johnson-CookPlasticity
A[Mpa]
B[Mpa]
n m C ε 0
[1/s]
Aluminum Plate 262 162.1 0.2783 1.34 - -
Projectile 1430 2545 0.7 1.03 0.014 15.0
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 9/33
Material Properties
• Aluminum Plate Johnson-Cook DynamicFailure Model
Material d1 d2 d3 d4 d5 MeltingTemperature
(°C)
TransitionTemperature
(°C)
ReferenceStrain Rate
1/s
AluminumPlate
-0.77 1.45 0.47 0 1.6 651.85 20.05 1
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 10/33
ABAQUS Material Definition1
2
3
4
5
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 11/33
ABAQUS Material Definition• Add Damage Evolution
• Set the displacement atfailure to 0.9
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 12/33
Creating an Assembly
• Double click on instances
• Set the projectile 100 mmfrom the origin (center of
the plate )
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 13/33
Interactions properties
• Double click in interaction properties, selectcontact. Select Mechanical, Normal Behavior
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 14/33
Interaction properties continued
• Select the default setand click OK
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 15/33
Interactions
• Double click on Interactions, General Contact,All with self and add the created IntProp-1 inindividual property assignment
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 16/33
Creating Mesh (partitioning)Aluminum Plate
• Create a Partition of the plate• Seed edges and select the partition lines
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 17/33
Creating Mesh (Continued)
• Repeat the procedure in the opposite directionsfor the rest of the internal lines
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 18/33
Creating Mesh
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 19/33
Creating Mesh Projectile
• Create a Partition of the projectile• Select an the approximate global size
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 20/33
Creating Mesh• From Mesh Element Type Select Element
Deletion for the Plate and the projectile
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 21/33
Creating a Step
• Double click Steps under Model tree andCreate step window will pop up
• This time you will modify the time period
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 22/33
Field Output Request
• Select SDEG scalar Stiffness degradation andStatus as output variables
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 23/33
Boundary Conditions
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 24/33
Results with v3 =-700000 anddisplacement at failure 0.9Time t 0 Time t 1
Time t 2 Time t 3
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 25/33
Results
Time t 4 Time t 5
Time t 6 Time t 7
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 26/33
Results
Time t 8 Time t 9
Time t 10 Time t 11
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 27/33
Results
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 28/33
Rebound of the projectile
• Change the value of predefined velocity field• Delete the damage evolution in Materials
Aluminum Plate
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 29/33
Boundary Conditions
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 30/33
Delete the Damage Evolution
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 31/33
Results
Time t 0 Time t 2
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 32/33
Conduct simulations
• Change the values of displacements at failurefrom 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, thetrajectory of the projectile and the velocity
• Improve the model using your favorite
meshing technique to refine the center of theplate or reduce the geometry to the half or aquarter.
8/10/2019 PLate Impact based on Johnson Cook Parameters
http://slidepdf.com/reader/full/plate-impact-based-on-johnson-cook-parameters 33/33
Notes
• By modifying the velocity from 100, 000 mm/sto 1,000 000 mm/s consider the time that youneed to input on step-time period.