Week - 1 - Consistency of Units

  Explicit Analysis: The explicit method solving allows problems element by elements. Compared with the implicit method it does not require the general matrix, since the velocity and displacement nodes can be counted directly, using the central difference integration. Time increment in explicit analysis is very short.…

  LS-DYNA doesn't have a default system of units. User needs to input material properties and physical dimensions according to a consistent system of units as per their choice. This warrants that to use LS-DYNA in different circumstances, users has to be conversant with converting quantities from one system of units to…

Question: Neon side crash -BIW Check unit system and either follow [Mg mm s] or [Kg mm ms]. Create appropriate interface ,friction 0.2 and recommended parameters. Make sure of no penetration and intersections. Create rigid wall with friction 0.1 as per referance model. Compare the model weight with the referance model…

Frontal crash-BIWCheck unit system and either follow[Mg mm s] or [Kg mm ms].Create appropriate interface ,friction 0.2 and recommended parameters.Make sure of no penetrations and intersection.Correct rigid bodies if any issues.Create rigid wall with friction 0.1.Compare the model weight with the full scale 300k nodes model…

    Questions: Create the mesh for bumper assembly,mesh size should be 6mm.  Run the crash tube model as it is. Change the Inacti=6 and run. Create the type 11 contact and run. Remove both notches  and remove boundary condition on rigid body node then run. Create a new notch in the middle ,select the…

  1. Total number of cycles, Energy error, mass error and simulation time.2. Notice the animation of all 5 and describe the animations in brief on thebasis of whether the elements are being deleted or cracked.3. Plot energies and notice any difference.4. Based on all the results, which case would represent the on-fieldscenario.5.…

  Questions: Comparison of results with base simulation and improved shell element properties 1.Using the crash beam file from the previous assignment, change the run time to 55 ms. 2. Change the number of animation steps during simulation to a minimum of 25 and maximum of 60. Run the base simulation without any modification…

    1. Check the material properties of the rail component and calculate the speed of sound in steel rail=_______ 2. The length of the rail is about 1000 mm.calculate the time takes for a shock wave to travel from one end of the rail to the other. 3.Time for sound to travel length of rail=______…

  Geometry Cleanup Exercise:  (Note: All the .hm models are done Radioss profile) Carry out the geometry cleanup operation on the given 3 files. Practice  Clip Repair Mounting Bracket There should not be any free edges, convert all of them into refine geometry. Clean the geometry. Extract midsurface.…

Target Element Length = 5mm S.N Quality Criteria  Value  1 Aspect Ratio  5 2 Skewness 45 3 Warping 15 4 Taper      0.5 5 Min. Length 2mm 6 Max. Length 8mm 7 Min angle Quad 45 8 Max angle Quad 135 9 Min angle Tria 20 10 Max angle Tria 120 10 Tria %  10     Importing the model:…

Follow the Quality Criteria and mesh the following component and assign thickness: Target Element Length = 4mm S.N Quality Criteria  Value  1 Aspect Ratio  5 2 Skewness 45 3 Warping 15 4 Taper      0.5 5 Min. Length 2mm 6 Max. Length 6mm 7 Min angle Quad 45 8 Max angle Quad 135 9 Min angle…

Mesh the given Component with a Mesh size of 5mm. Create connector and Attach the various parts of the given model  Right_Rail_2 & Front_truss_1:- Seam-Quad(angled+capped+L) Left_Rail_2 & Front_truss_1:- Quad elements Front_truss_2, Front_truss_1 & Right_Rail_1:- Spot weldwith 3 Layers and 5…

3D Meshing: Elements sizes: Min- 2mm, Target- 5mm, Max- 7mm  Tet collapse: 0.15     Create Teramesh for Housing   Importing the model.     Delete the solids if any exists.   Surface cleanup is done before 2D meshing.   Creation of Mesh: 2D -- >  automesh      …

Quality criteria, mesh the component given below and assign thickness: Target Element Length = 5mm S.N Quality Criteria  Value  1 Aspect Ratio  5 2 Skewness 45 3 Warping 15 4 Taper      0.5 5 Min. Length 2mm 6 Max. Length 8mm 7 Min angle Quad 45 8 Max angle Quad 135 9 Min angle Tria 20 10…

Create 1D elements on the following component with given cross-section and DOF Rod element:- with only translational DOF and RBE2 link Cross-Section: BOX- Dimension a= 12 mm                               Dimension b=10 mm        …