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Tube Crush Analysis Using LS DYNA
Satish B. Dronavalli
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Contents� Introduction� Objective� Modeling� Results and Analysis� Future Work
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Introduction� Crush analysis on thin Cylinder� Impact of Titanium Striker on Al Cylinder
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Objective� Develop a model in HyperMesh� Conduct simulation using LS DYNA� Determine the buckling of the Al
Cylinder� Deflection of the cylinder in load
direction� Impact of striker at different angles and
Velocities
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Materials� Cylinder Aluminum
� End Caps Steel
� Striker Titanium
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Material Models� Inelastic Plastically deformed
kinematicaly hardened (MAT L3) Elements
� Shell 163 Cylinder� 3-D Solid End Caps & Striker
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Boundary Conditions� One of the end cap is fully constrained
� Other end cap is impacted by striker
� Initial velocity is applied to striker
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DimensionsDiameter 20mmLength 60mmThickness 1mm
O.D 24mmID 20mmThickness 4mmFlange 2mm
Cylinder
End Cap
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Cont’d
Mass 200gramsDiameter 35mmLength 50mm
Striker
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Material Properties
8300.33-1154730Titanium
3450.33772007860Steel
1000.3326702800Aluminum
Yield StressMpa
Poisson Ratio
Modulus of
rigidityGpa
Modulus of
ElasticityGpa
Density
Kg/m3
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Softwares � Solid Works
� ANSYS� Hypermesh
� LS POST
Modeling
Pre Processor
Post Processor
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Solid Model
End Cap
Shell
Striker
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Meshed Model
Constrained
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Hyper Mesh Model
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Hyper Mesh Vs Ansys
Mesh is much cleaner in Hyper Mesh
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Contact Algorithms� Surface to Surface
� Surface to Node
� Tied option
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Strain Contour
Strain in the Load direction
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Deformed Cylinder
Before After
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Displacement
Initial Velocity 57.7 m/s
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Future Work� Experimental Data
� Load Application at Different Inclination
� Refinement of Mesh
� Adaptive Mesh