Step Time control

Playu

Hi. I have the following quation. Maybe some user can give me some advises.

I am doing a linear elastic analysis over a non-homogneous lattice structure. I would like to control the step timing to obtain the displacement of 1 point (for example) over time. I would like to obtain something like an history output of some variable. Although, it is a static problem where only one instant it is necesary to solve the equation systems, I would like to know if, like in other FEA softwares, it is possible to, for instance, obtain the response over a ramp loading step from 0 to the Force value in one second.

Thanks in advantage

Sergio

You could solve the problem as no lineal with lineal material properties.

"If you want to control the sequence in which loads are applied or ramp them up gradually, check the Quasi-static box and specify the Time period and Time step size under Analysis → Edit. Time here is a pseudo variable which is only used to control the sequence of applied loads. No time dependent effects like inertia or creep are being modeled.
Loads can be either constant or time dependent. Often constant loads are sufficient but sometimes it's necessary to gradually increase a load from zero to the maximum over several time steps. This is especially true if there are large rotations which may influence the load or large changes in stiffness. It's also useful to pre-stress a structure before additional loads are applied."

Playu

Thanks for your answer.

I had tried before this option but We are using beams which are not supported in the Internal solver. I changed to CCX but only rectangular section can be used. I suppouse that I can introduce general section properties as a KeyWord in CCX but I cannot still tried.

Victor

If you change line2 elements to line3, then these extra section shapes become available with CCX:

• circle
  
• cylinder
  
• rectangular tube
  

With the internal solver, you could use dynamic response with strong Rayleigh damping so that it's effectively static behavior.