Assignment 4-RADIOSS Material Laws Challenge
OBJECTIVE:Comparison of material properties and properties with changed properties.
Compare 7 cases as discussed in last 3 slides, in a tabulated format on the basis of:
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 the
basis 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-field
scenario.
5. Prepare a ppt/docx and list down case by case result and your conclusion
as to why the failure happened.
SOFTWARE USED:Altair- Radioss.
ABOUT SOFTWARE: Radioss is a solver which is used in CAE domain.It is a powerful multiphysics design tool with optimisation and ready integration with other
altair tools and third party solutions.
Example: crash, safety, impact analysis and drop test.
radioss explicit analysis may include:
1)explicit dynamic analysis.
2) transcient heat transfer and thermomechanical coupling.
3) explicit arbitary and euler legrangian formulation.
INTRODUCTION TO RADIOSS:
1) First radioss ,run , time steps.
2) Element properties
3) Material properties
4) Hypercrash
5) interface modelling
6) kinetic condition
7) load defnition
8) methods to increase simulation spped -time step control.
9) output requests
10) debugging an error.
PROCEDURE:
1) Import a .rad file: In any solver it is necessary to import a .rad file why because the rad extension means radioss file. before goint to import we need to set up
in a radioss solver . below figure represents the solver
CASE TOTAL NO OF CYCLES ENERGY ERROR MASS ERROR TOTAL SIMULATION RUN TIME
1 49379 0.8% 0.00% 122.38s
2 49216 4.1% 0.00% 126.94s
3 49407 0.8% 0.00% 126.94s
4 48736 3.0% 0.00% 121.28s
5 47968 1.3% 0.00% 119.14s
6 49506 0.8% 0.00% 128.47s
7 48736 3.0% 0.00% 121.28s
By observing these cases
case 6 takes more cycles and it takes more run time than other for law_27.it is only used for brittle materials.
comparing case 1 and case 2 we will coclude that after assigning the failure johnson card in case 2 it resist the stress more compared to case 1.
After deleting the failure card in case 3 it shows it only resist the stress less than case 1. so johnson failure card is good to resist more stress.
with case 4 there is strain energy and there is no brakage due to put the value to 0. so we conclude that without assigining the epspmax is used to find the how much it elasticity and plasticity.
After observing case 5 it changed to law 1 it induce maximum strain.material is completely elastic.concluding case 4 with 5, there is a large strain energy induced.
in case 4.
case 6 is for brittle materials.case 7 is mostly used for laboratory conditons.it is very useful to get more accurate results.compared to all cases , case 7 is more preferable.