Material data and Time Step

Altair Forum User

 I am looking for ElastoPlastic Properties for Steel so that I can use in Law2 or Law36. I tried in web but could not find the same. 

i also have one more question. Sometimes my simulation is taking really long time and the DT goes to E-17. Can you please tell me how and which card I should use to control my DT to E-6 so that my simulation takes less time. 

 

 

Altair Forum User

Hi,

Search /mat/law2 in our help menu and there you can see as an example the material values for steel is added. It may help you.

 

Regarding time step, find what is causing for this time step drop.

First, check which object is responsible for the low time step in the listing file (Runname_nnnn.out) of RADIOSS Engine. It can be anelement, a node or an interface.

•For an element, check the related material (especially its Young modulus and density in case of an elastic-plastic material; and its viscosity in case of a visco-elastic material). There must not be an error in the units system that this data is given in.

Check the size of the element, since elemental length is proportional to time step.

•For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified.

•For an interface, the gap of the interface must be verified if some failure happens on the master or the slave side of the interface.

 

Once this is cleared you can run the simulation without time step being dropped.

 

Please refer the video below for timestep in Radioss Explicit:

https://altair-2.wistia.com/medias/o0bfml9ah5

 

And also visit the below link for more info on time step control without compromising the accuracy:

http://www.altairhyperworks.com/html/en-US/rl/RADIOSS_Simulation_91212.htm