Assignment 5

AIM:

1. Run the crash tube model 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 node then run.
5. Create a new notch in the middle ,select the whole section and run.
6. Create a new notch with nodes only from opposing 2 faces and run.
7. Plot RWALL forces ,contact forces,internal energy and Create TH/PART for all parts and compare results for all cases.
8. Comment your thought on why there is a change in the internal energies.
9. How does the notch affect the results?
10. Plot energies and note any difference.

PROCEDURE:

CONTACT & INTERFACES:

               This card is represented as a group in HyperMesh. CONTACT models an interface between a master surface and a set of slave grid points. A grid point can be at the same time as a slave and a master node.                     

STUDY-1: RUN THE CRASH TUBE MODEL AS IT IS (TYPE-7 CONTACT)

In this case we run the crash tube model 0001 file in Hypercrash

Then import the rad file in Hyperworks & run the simulation using radioss option using analysis module.

Then calculate the energy error & mass error in 00001.out file

Energy error: -3.8%

Mass error: 0

Then import the h3d file in Hyperview to check contour plot on von misses stress with simple average method & contact forces in the form of animations.

Von misses:

Contact forces:

Then plot the graphs by selecting Hypergraph-2d. Plot the graophs for internal, kinetic, contact & total energy. Also plot the graph for rigid wall forces.

KINETIC ENERGY:

                             The kinetic energy decreases gradually with increase in time & the maximum value is upto 44400.8 KN

TOTAL ENERGY:

                         The total energy decreases gradually with increase in time & the maximum value is upto 44400.8 KN

INTERNAL ENERGY:

                                The internal energy increases gradually due to forces being applied at one end & the maximum value is upto 42273.2 KN

CONTACT ENERGY:

                              The contact energy increases gradually with time & the maximum value is upto 2029.46 KN

RIGID WALL FORCES:

                                   The rigid wall forces are gradually increasing & the maximum value is upto 1337.9 KN 

STUDY-2: CHANGE THE INACTI=6 & RUN THE MODEL

In this case we run the crash tube model 0001 file in Hypercrash

Then import the rad file in Hyperworks & run the simulation using radioss option using analysis module.

Then calculate the energy error & mass error in 00001.out file

Energy error: -3.8%

Mass error: 0

Then import the h3d file in Hyperview to check contour plot on von misses stress with simple average method & contact forces in the form of animations.

Von misses:

Contact forces:

Then plot the graphs by selecting Hypergraph-2d. Plot the graophs for internal, kinetic, contact & total energy. Also plot the graph for rigid wall forces.

KINETIC ENERGY:

                             The kinetic energy decreases gradually with increase in time & the maximum value is upto 44400.8 KN

TOTAL ENERGY:

                         The total energy decreases gradually with increase in time & the maximum value is upto 44400.8 KN

INTERNAL ENERGY:

                                The internal energy increases gradually due to forces being applied at one end & the maximum value is upto 42273.2 KN

CONTACT ENERGY:

                              The contact energy increases gradually with time & the maximum value is upto 2029.46 KN

RIGID WALL FORCES:

                                   The rigid wall forces are gradually increasing & the maximum value is upto 1337.9 KN 

 STUDY-3: CREATE THE TYPE-11 CONTACT & RUN THE MODEL (CHANGING FROM TYPE-7 TO TYPE-11)

In this case we run the crash tube model 0001 file in Hypermesh

Then import the rad file in Hyperworks & run the simulation using radioss option using analysis module.

Then calculate the energy error & mass error in 00001.out file

Energy error: -8.1%

Mass error: 0

Then import the h3d file in Hyperview to check contour plot on von misses stress with simple average method & contact forces in the form of animations.

Von misses:

 Contact forces:

Then plot the graphs by selecting Hypergraph-2d. Plot the graophs for internal, kinetic, contact & total energy. Also plot the graph for rigid wall forces.

KINETIC ENERGY:

                             The kinetic energy decreases gradually with increase in time & the maximum value is upto 44400.8 KN

TOTAL ENERGY:

                         The total energy decreases gradually with increase in time & the maximum value is upto 44400.8 KN

INTERNAL ENERGY:

                                The internal energy increases gradually due to forces being applied at one end & the maximum value is upto 40304.7 KN

CONTACT ENERGY:

                              The contact energy increases gradually with time & the maximum value is upto 3921.34 KN

RIGID WALL FORCES:

                                   The rigid wall forces are gradually increasing & the maximum value is upto 1521.42 KN 

NOTCHES:

                The notch is created in the middle of crash tube by using edge offset command in hypermesh and created a boundary condition in hypercrash. The initial deformation occurs at the middle of notch and to get proper deformation i created a boundary condition in rigid body.

STUDY-4: REMOVE BOTH NOTCHES AND REMOVE BOUNDARY CONDITION ON RIGID BODY NODE AND THEN RUN

In this case we run the crash tube model 0001 file in Hypermesh

Then import the rad file in Hyperworks & run the simulation using radioss option using analysis module.

Then calculate the energy error & mass error in 00001.out file

Energy error: -3.1%

Mass error: 0

Then import the h3d file in Hyperview to check contour plot on von misses stress with simple average method & contact forces in the form of animations.

Von Misses:

Contact forces:

Then plot the graphs by selecting Hypergraph-2d. Plot the graophs for internal, kinetic, contact & total energy. Also plot the graph for rigid wall forces.

 

KINETIC ENERGY:

                             The kinetic energy decreases gradually with increase in time & the maximum value is upto 44400.7 KN

TOTAL ENERGY:

                         The total energy decreases gradually with increase in time & the maximum value is upto 44400.7 KN

INTERNAL ENERGY:

                                The internal energy increases gradually due to forces being applied at one end & the maximum value is upto 42544 KN

CONTACT ENERGY:

                              The contact energy increases gradually with time & the maximum value is upto 1628.6 KN

RIGID WALL FORCES:

                                   The rigid wall forces are gradually increasing & the maximum value is upto 1173.8 KN 

STUDY-5: CREATE A NEW NOTCH IN THE MIDDLE, SELECT THE WHOLE SECTION & RUN

In this case we run the crash tube model 0001 file in Hypermesh

Then import the rad file in Hyperworks & run the simulation using radioss option using analysis module.

 

Then calculate the energy error & mass error in 00001.out file

Energy error: -3.5%

Mass error: 0

Then import the h3d file in Hyperview to check contour plot on von misses stress with simple average method & contact forces in the form of animations.

Von Misses:

Contour Energy:

Then plot the graphs by selecting Hypergraph-2d. Plot the graophs for internal, kinetic, contact & total energy. Also plot the graph for rigid wall forces.

KINETIC ENERGY:

                             The kinetic energy decreases gradually with increase in time & the maximum value is upto 44400.7 KN

TOTAL ENERGY:

                         The total energy decreases gradually with increase in time & the maximum value is upto 44400.7 KN

INTERNAL ENERGY:

                                The internal energy increases gradually due to forces being applied at one end & the maximum value is upto 42544 KN

CONTACT ENERGY:

                              The contact energy increases gradually with time & the maximum value is upto 1628.6 KN

RIGID WALL FORCES:

                                   The rigid wall forces are gradually increasing & the maximum value is upto 1173.8 KN 

STUDY-6: CREATE A NEW NOTCH WITH NODES ONLY FROM OPPOSING 2 FACES & RUN

In this case we run the crash tube model 0001 file in Hypermesh

Then import the rad file in Hyperworks & run the simulation using radioss option using analysis module.

Then calculate the energy error & mass error in 00001.out file

 

Energy error: -3.6%

Mass error: 0

Then import the h3d file in Hyperview to check contour plot on von misses stress with simple average method & contact forces in the form of animations.

Von Misses:

Contact Energy:

Then plot the graphs by selecting Hypergraph-2d. Plot the graophs for internal, kinetic, contact & total energy. Also plot the graph for rigid wall forces.

KINETIC ENERGY:

                             The kinetic energy decreases gradually with increase in time & the maximum value is upto 44400.7 KN

TOTAL ENERGY:

                         The total energy decreases gradually with increase in time & the maximum value is upto 44400.7 KN

INTERNAL ENERGY:

                                The internal energy increases gradually due to forces being applied at one end & the maximum value is upto 42544 KN

CONTACT ENERGY:

                              The contact energy increases gradually with time & the maximum value is upto 1628.6 KN

RIGID WALL FORCES:

                                   The rigid wall forces are gradually increasing & the maximum value is upto 1173.8 KN 

RESULTS:

•     We have seperated the cases into two parts first 3 cases as contact types & interfaces & next 3 cases as notches.
•     In the first 2 cases there is no difference because no initial penetrations in the model for Inacti to have an effect. It has increased                  no of  cylces & other parameters because, we have selected Type-11 edge to edge contact.
•     In the next 3 cases, notches plays a vital role. Notches are first collapse in the event of a crash by controlling the rigid wall forces,                  contact energy, internal energy flow can be controlled.
•     It is observed from the animations that deformation takes place from the notches. But contact forces have some changes in their values.
•     Thus the given cases are divided into two sub categories i.e; (contact interfaces & notches)