error of zero or negative volume
Altair EmployeeI have received this error message. I read that I have to do the following settings for proprty of plastic
<?xml version="1.0" encoding="UTF-8"?>
I have activated the ENG/DT/BRICK CST as well and set Tscale and T min as follwing (are the valuses for Tscale and T min correct?) but I still get the same error. Would you please check my attached model and see what is wrong? Thanks a lot in advance
<?xml version="1.0" encoding="UTF-8"?>
Prakash Pagadala
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Hi,
Please refer to the following posts:
Thanks for your reply Prakash. I am using Radioss block 120 and I am using Hexa elements. So I read the posts you have refered before but they didn't help me. I have used M36 Plas TAB plastic and I have used P14 SOLID as card image. What should be the values for
ISOLID ?
Ismstr ?
Icpre ?
I have activated DT/Brick/CST in control card what shoulbe the values for Tscale and Tmin
is it ok to use hexa elements here or do I have to switch to tetra. (As I read before tetra elements are stiffer than hexa. Does it help to switch to tetra?)
Thanks for your help
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Hi,
Isolid is the element formulation.Ismstr is the small strain formulation.See attached document.
http://www.altairuniversity.com/free-ebooks-2/free-ebook-crash-analysis-with-radioss-a-study-guide/
link for downloading Free Ebook .(Crash analysis with Radioss)
Regards
Rahul R
Altair EmployeeThanks a lot for your replies
Hi,
There are different solid element formulations available in RADIOSS. Depending on the number of intergration points, stabilization, etc... these are categorized.
Please go through these type and you can decide which one fits for your model and also Ismstr (for small strain formulation, etc...) is compatible with few solid formulations but not with all. Icpre is only used for Isolid=14 (HA8), Isolid = 17 (H8C), and Isolid = 24 (HEPH).
By default, Tscale is 0.9 and Tmin depends on the time step and used to control the time step.