Stress strain curve and material definition

hiranwale_bharat

Hello everyone,

 

I have to analyze component with rubber material. I am fairly new to this kind of material.

I have stress strain curves of those materials in tension.But actually the component is going to be under compression. So is it ok to use that data for defining material? (I feel it is not right as rubber is non linear)

What else data is needed for correct definition of the material?Also while defining the material through stress strain curve should the stress and strain be engineering or true?

 

Regards,

Bharat

Altair Forum User

Hi Bharat,

 

It would be better if you have Stress strain data from a compression test.

 

You need to input True stress-strain data for the analysis.

hiranwale_bharat

Hello Prakash,

Thank you for the helpful reply.

 

I would like to ask that whether only stress strain curve is sufficient to define the material or other data is also needed? If yes what is that?(apart from density of course)

 

Regards,

Bharat

Altair Forum User

Hi Bharat,

 

In OptiStruct you have to take care of few more options.

 

 

Please go through the video tutorial available @ http://training.altairuniversity.com/analysis/structural/nonlinear/nlstat-tutorial-pressure-load-on-a-chair/ 

hiranwale_bharat

Hello Prakash,

 

Thanks for the help. But the link seems to be broken as I am getting 404 error. Is there any other data you can share?

 

Regards,

Bharat

Altair Forum User

http://training.altairuniversity.com/analysis/structural/nonlinear/nlstat-tutorial-pressure-load-on-a-chair/

Altair Forum User

Try the above link, please.

hiranwale_bharat

Thank You Praksah. The link works just fine.

 

Regards,

Bharat

Emir Eminoğlu_22301

Altair Forum User said:

http://training.altairuniversity.com/analysis/structural/nonlinear/nlstat-tutorial-pressure-load-on-a-chair/

first of all hi to eveyone

the link is not working.. and im trying to do a nonlinear analysis of brake pedal with polyamide 06

the linear static analysis is done but with nonlinear static a have these problems;;

1. he is not accepting my stress strain table

*** ERROR # 3019 ***
TABLES1 bulk data entry ID=3 has a segment that corresponds to zero or
negative hardening. This may lead to poor convergence and excessive
plastic flow.

does the progrom acceptes only true cuves?? how to insert an eninering stress strain curve

2. can you share with me any useful tutorials about this analysis

3. working with 2017.2 hypermesh optistruct

**my gole is to get the topology results with required parameters and produce it with a 3d printer