Problem in initial velcoity

RAMGANESH

Dear Sir,

 

I am working on the impact analysis of the bullet on the kevlar fibre  i have given the velocity 950 m/s but the simulation is not running properly. kindly provide your guidelines

 

 

Thanks 

RAM

Rahul Rajan_21763

Hi,

 

Please make sure that the unit should be consistent. 

In input deck of /BEGIN first two lines of input  unit & working unit should be same.

 

Regards

Rahul R

RAMGANESH

Dear Sir,

 

Units are consistence in my file

 

Thanks

RAM

Rahul Rajan_21763

How long it is running?

RAMGANESH

26.06 secs

<?xml version="1.0" encoding="UTF-8"?>

Rahul Rajan_21763

looks like Run completed.What problem you are facing?

RAMGANESH

Yes sir, the run is completed but the bullet is not moving as expected..

RAMGANESH

I shared my model to you sir kindly check and inform the corrections to be made....

Rahul Rajan_21763

Hi,

I don't see any Engine parameter in your deck. Please define common engine parameter & run.

See attached screenshot for the same.

Regards

Rahul R

<?xml version="1.0" encoding="UTF-8"?>

RAMGANESH

Dear Sir,

 

I have already defined all engine parameters but while generating deck file from hypermesh it doesn't exported.however selected the merge starter and engine icon during export and generated the deck file with engine parameters as you mentioned but while solving geeting zero or negative volume for 3D element error 166

 

Thanks 

Ram

Rahul Rajan_21763

Hi,

Use the small strain formulation with 8 integration points solid elements to overcome this negative volume error.

Set Isolid =14 with Inpts =222. Also set Icpre =1 for elastic or visco-elastic material law, and Icpre =2 for elasto-plastic laws.

This should fix the error and give you good results, let me know if this helps.

See attached Doc as well.

Regards

Rahul R

Unable to find an attachment - read this blog

RAMGANESH

Dear Sir,

 

Same error occurs after the corrections made as per your instruction.

 

Thanks

Ram

Rahul Rajan_21763

Share the updated file to my FTP.

Regards

Rahul R

RAMGANESH

Dear Sir,

 

File shared

 

Thanks

Ram

RAMGANESH

Dear Sir,

 

Did you receive my updated model which i had send yesterday.

 

Thanks

Ram

Rahul Rajan_21763

Hi,

I got your model yesterday.Let me take a look and get back to you.

Regards

Rahul R

RAMGANESH

Dear Sir,

 

I am awaiting for your guidelines Sir

 

Thanks

Ram

Altair Forum User

Hi Ram,

 

As I have told in an earlier post, please check your interface definition,

 

Please go through the examples and tutorials available on RADIOSS help for more information.

RAMGANESH

Dear Sir,

 

I have created the interface between the bullet and composite fibre.

Type 7

Master part = Bullet

Slave part = composite fibre.

I have updated the parts and review the components ..

 

What error i have done in this interface please mention Sir,It will be helpful for my current and future work

 

Thanks

Ram

Altair Forum User

Ram,

 

in your model you hvae used type 20.

 

Though this will work but there is no master and slave surfaces defined in this contact. Please check.

 

 

<?xml version="1.0" encoding="UTF-8"?>

RAMGANESH

Dear Sir,

 

I have used type 20 as well as type 7 and checked the model for the run but the same error occurs.

 

Kindly find the screenshot below

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Ram,

 

You need to create a contact surface and node group for slave and master segments when you use type7 

 

Selecting components when creating type 7 may not work.

RAMGANESH

Dear Sir,

 

What is the procedure for it?

 

Is there is any tutorial for it?

RAMGANESH

Dear Sir,

 

As per your instruction I have created the contact surfaces on the Composite fiber and created entity node sets on the bullet and updated the interfaces then run the simulation but the same error occurs.

 

Thanks

Ram

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi Ram,

The contact direction is wrong in your model.

I suggest you to go through the tutorials on RADIOSS help on how to create contact surfaces and interfaces.

 

RAMGANESH

Dear Sir,

I had run the model which you had sent after creating the engine parameters but my simulation gives results like these

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

RAMGANESH

Dear Sir,

I am expecting results like these 

 

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

RAMGANESH

Dear Sir,

I have given initial velocity of 1300 m/s in z axis but the bullet is not moving as expected .

I think my error will be on time definition on engine parameters.

Kindly guide me

Altair Forum User

Ram,

check material properties and if you think time is a factor, increase the simulation in \RUN

RAMGANESH

Dear Sir,

if i increase the time in \RUN the solving time increases larger

<?xml version="1.0" encoding="UTF-8"?>

RAMGANESH

Dear Sir,

I have tried with different time in \RUN the result is same but the solving time only increases .The bullet is not moving as expected