Assignment 5-RADIOSS Interfaces & Study of Effect of Notches Challenge

ModeAim: Simulate the crushtube aganist the rigid wall and compare the effect of notch with help of specific cases mentioned below.And plot and compare the Rwall forces,contact forces,internal energy and TH/part for all cases.

1.Run the crush tube as it is.

2.Change the Inacti=6 and run

3.Create the Type 11 contact and run

4.Remove both notches and remove boundary condition on rigid body then run.

5.Create new notch in middle ,select the the whole selection and run.

6.Create a new notch with nodesany from opposing 2 faces and run.


Here the given asset to simulate the crush tube is .rad files 


Case-1:Run the crush tube as it is:

1.open the hyper mesh window and select the radioss import > import the solver deck >select the crush tube 0000.rad file >import.

2.We will switch between model,part,solver if suppose solver is not visible then Goto view >browser >select the solvers.

3.For the best practice from the model view >properties >i have chnaged the Ismstr =2,Ish3n=2 used if Ishell =24 used(recommended values for when we use the Ishell=24 QEPH shell element.)

4.As per challenge TH/Part this can be done before start of the simulation,In the solver view >right click,create > select the TH,Part> and once done rename and when we open that entity ,it will ask to select the Entity Ids(as it says we need to select the 4 entitys of the crush tube) and OK

5. once this is done Analysis >radioss >set up the like file save and speed required to solve problem (-nt 4) >click the Radioss. If any errors it throws otherwise it will start the simulation. Results as shown below.












Case-2: Change the inacti=6 and Run:

1.open the hyper mesh window and select the radioss import > import the solver deck >select the crush tube 0000.rad file >import.

2.We will switch between model,part,solver if suppose solver is not visible then Goto view >browser >select the solvers.

3.For the best practice from the model view >properties >i have chnaged the Ismstr =2,Ish3n=2 used if Ishell =24 used(recommended values for when we use the Ishell=24 QEPH shell element.)

4.As per challenge TH/Part this can be done before start of the simulation,In the solver view >right click,create > select the TH,Part> and once done rename and when we open that entity ,it will ask to select the Entity Ids(as it says we need to select the 4 entitys of the crush tube) and OK.

5.In the solver tab >from the list select the INTER side arrow select the TYPE_7 contact in the card change the inacti to 6

6. once this is done Analysis >radioss >set up the like file save and speed required to solve problem (-nt 4) >click the Radioss. If any errors it throws otherwise it will start the simulation. Results as shown below.

                  














Case-3: Create the TYPE_11 contact and Run:

1.open the hyper mesh window and select the radioss import > import the solver deck >select the crush tube 0000.rad file >import.

2.We will switch between model,part,solver if suppose solver is not visible then Goto view >browser >select the solvers.

3.For the best practice from the model view >properties >i have chnaged the Ismstr =2,Ish3n=2 used if Ishell =24 used(recommended values for when we use the Ishell=24 QEPH shell element.)

4.As per challenge TH/Part this can be done before start of the simulation,In the solver view >right click,create > select the TH,Part> and once done rename and when we open that entity ,it will ask to select the Entity Ids(as it says we need to select the 4 entitys of the crush tube) and OK.

5.In the solver tab >from the list select the INTER side arrow select the TYPE_11 contact in the card change the inacti to 6.

6.we can create the type_11 contact in two ways either from the model view tab in Group entity and right click and create contact and selcect the TYPE_11. OR from the solver tab INTER entity and create the contact both ways recommended changes can be done as shown below. 

6. once this is done Analysis >radioss >set up the like file save and speed required to solve problem (-nt 4) >click the Radioss. If any errors it throws otherwise it will start the simulation. Results as shown below.

    














Case-4: Remove the notches and remove the boundary condition on rigid body node then run:


1.open the hyper mesh window and select the radioss import > import the solver deck >select the crush tube 0000.rad file >import.

2.We will switch between model,part,solver if suppose solver is not visible then Goto view >browser >select the solvers.

3.For the best practice from the model view >properties >i have chnaged the Ismstr =2,Ish3n=2 used if Ishell =24 used(recommended values for when we use the Ishell=24 QEPH shell element.)

4.As per challenge TH/Part this can be done before start of the simulation,In the solver view >right click,create > select the TH,Part> and once done rename and when we open that entity ,it will ask to select the Entity Ids(as it says we need to select the 4 entitys of the crush tube) and OK.

5.In the solver tab >from the list select the INTER side arrow select the TYPE_11 contact in the card change the inacti to 6.

6.we can create the type_11 contact in two ways either from the model view tab in Group entity and right click and create contact and selcect the TYPE_11. OR from the solver tab INTER entity and create the contact both ways recommended changes can be done as shown below. 

7.To remove the notchs using Geometry >node edit > using align node option. Using this we can remove the notches from the model.

6. once this is done Analysis >radioss >set up the like file save and speed required to solve problem (-nt 4) >click the Radioss. If any errors it throws otherwise it will start the simulation. Results as shown below.



           














Case-5: Create a new notch in the middle in the ,select the the whole selection and run:

1.open the hyper mesh window and select the radioss import > import the solver deck >select the crush tube 0000.rad file >import.

2.We will switch between model,part,solver if suppose solver is not visible then Goto view >browser >select the solvers.

3.For the best practice from the model view >properties >i have chnaged the Ismstr =2,Ish3n=2 used if Ishell =24 used(recommended values for when we use the Ishell=24 QEPH shell element.)

4.As per challenge TH/Part this can be done before start of the simulation,In the solver view >right click,create > select the TH,Part> and once done rename and when we open that entity ,it will ask to select the Entity Ids(as it says we need to select the 4 entitys of the crush tube) and OK.

5.In the solver tab >from the list select the INTER side arrow select the TYPE_11 contact in the card change the inacti to 6.

6.we can create the type_11 contact in two ways either from the model view tab in Group entity and right click and create contact and selcect the TYPE_11. OR from the solver tab INTER entity and create the contact both ways recommended changes can be done as shown below. 

7.once the model is plane which is no notches ,using Tools >translate >select the node based on the global syatem we can select the direction move since it not mentiond how much we move and make sure it should not penetrated. if it exist it will reflect in the contour.

6. once this is done Analysis >radioss >set up the like file save and speed required to solve problem (-nt 4) >click the Radioss. If any errors it throws otherwise it will start the simulation. Results as shown below.















Case-6: Create the notch with nodes only from opposing 2 faces and run:

1.open the hyper mesh window and select the radioss import > import the solver deck >select the crush tube 0000.rad file >import.

2.We will switch between model,part,solver if suppose solver is not visible then Goto view >browser >select the solvers.

3.For the best practice from the model view >properties >i have chnaged the Ismstr =2,Ish3n=2 used if Ishell =24 used(recommended values for when we use the Ishell=24 QEPH shell element.)

4.As per challenge TH/Part this can be done before start of the simulation,In the solver view >right click,create > select the TH,Part> and once done rename and when we open that entity ,it will ask to select the Entity Ids(as it says we need to select the 4 entitys of the crush tube) and OK.

5.In the solver tab >from the list select the INTER side arrow select the TYPE_11 contact in the card change the inacti to 6.

6.we can create the type_11 contact in two ways either from the model view tab in Group entity and right click and create contact and selcect the TYPE_11. OR from the solver tab INTER entity and create the contact both ways recommended changes can be done as shown below. 

7.In this case we will make notchs which are opposite to each other and remaining side we will make plane ,using Tools >translate >select the node based on the global syatem we can select the direction move since it not mentiond how much we move and make sure it should not penetrated. if it exist it will reflect in the contour.

6. once this is done Analysis >radioss >set up the like file save and speed required to solve problem (-nt 4) >click the Radioss. If any errors it throws otherwise it will start the simulation. Results as shown below.













Obbservations:

1.Internal energy when the force at a point due to this get some acceleration and it gives dispalcement when the tube is crushing towards the wall energy observed by the each element slowly increase when it comes closer to the wall it increase somewhat in the plot for the cases mentioned in the above . For the case_4 we can observe that there is no notches effect of the internal energy is decrease and we have used to the QEPH element the effect of the hourglass is avoided can be seen in the plots. Absense of the Hourglass every element of the node undergo deformation and energy observed by each element is possible.

2.Suppose lets look at example component which has thickness and has bendings in the surfaces if we apply force  and press both sides of hand keeping it in the middle  it will not bend easily and if we consider plain component do the same it will bend. Because the geometry shape has changed and because of the bendings the stiffness has increased. If we observe the contours more notches more force and less notches less force in the 1st three cases we could see.

3.For the notches are higher force required is higher less notches foreces required less. when it comes to stiffness notches has higher stiffness.


Result:

Simulation has been done the crushtube aganist the rigid wall and compare the effect of notch with help of specific cases mentioned .And plots are made and compared the Rwall forces,contact forces,internal energy and TH/part for all cases.

Aim:For the given bumber model we need to mesh with given size below.

Mesh size=6mm

Theory:
Once the model is imported in this challenge some of the surfaces not intersected and not extended properly we need to do this geometry cleanup before going to meshing.we can use different surfaces to intersect like self intersecting and select the one suface and select the 2nd surface to intersect.

Procedure:

1. import the model.
2.Geometry cleanup
3. meshing 

1. import the geometry:

Open the heypermesh window and file >open > model . after selecting the model it helps to oprn the model and press the F key will help us to fit the model.



            
                                  Fig:imported the model in Auto mode

2.Geometry Cleanup:

Once the model the is in GUI . In this model cleanups are the intersections and deletion,extend the surface.Using surface intersect option i have intersected the surfaces ,geometry >surface edit >select the trim with surfaces >self intersect.

In the the same tab use the extend option which is used to extend the surface here it require edge of surface and also require the target surface.Geometry >surface edit >extend .


                                             Fig:Ready to mesh model.

3.Meshing:

Once the model is ready for the meshing we can proceed for meshing. 2D >automesh >change the mesh size change to 6 if the default value exist. And the complete meshed model as shown below.




                                                   Fig:Completely Meshed Model

Result:

For the given bumber model we need to mesh has been with given mesh size 6