Example 1 LS Dyna - Bullet model Simulation

Example 1: Bullet impact

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Ex. 1: Bullet impact Q

New model Q Q

Ident Bullet Symmetry 3D, Z

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Load Materials – CART BRASS, FLOATGLASB, LEAD (Shock, Steinberg Guinan) Add erosion to all materials (geometric strain = 1.0)

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Import parts from dyna: BulletInner.K and BulletOuter.K

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Delete components Create new component containing both parts Transform component Q Q Q

Rotate 180 degrees about Y-axis Rotate 150 degrees about Z-axis Translate –0.36mm in X direction

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Ex. 1: Bullet impact Q

Define Initial Conditions Q Q Q Q Q Q

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Define Boundary Conditions Q Q Q

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Name: Fixed Type: General 3D Velocity Set all parameters to 0.0

Fill parts with initial conditions Q Q

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Name: Inner Material: Lead Velocity: X=519.6m/s, Y=-300m/s Name: Outer Material: CART BRASS Velocity: X=519.6m/s, Y=-300m/s

Fill Core with Inner Fill Casing with Outer

Delete unused materials

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Ex. 1: Bullet impact Q

Create Part Q Q Q Q Q Q Q Q

Name: Target Solver: Lagrange Select: Parts Wizard Predef: Box Origin: (0.0,-50.0,0.0) Size: 2.5x100.0x50.0 Numerical size: 5x50x25 Grade Zoning Q Q

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In J direction, 0.5mm,20 cells, centred In K direction, 0.5mm,10 cells, lower K

Fill with FLOATGLASB

Convert part to IJK (from import pull down menu)

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Ex. 1: Bullet impact Q

Define Group Q Q

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Add nodes to group Q

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Name: Fix Type: Nodes

Use Alt+left mouse button to draw polygon as shown Use Control+left mouse button to close polygon

Apply boundary condition “Fixed” to group

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Ex. 1: Bullet impact Q

Join two parts of bullet together.

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Define Interactions Q

Calculate gap size and check.

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Define Wrap-up Criteria

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Define Save times

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Save and execute

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