Note: This question is about AceFEM and AceGen package for automatic code generation for finite element analysis.
If the question is not specific enough, I will try to refrase it, but I am a fairly new user of AceGen/AceFEM package, so I hope this is not an extremely trivial question.
In order to achive that, I compute the left side of equation at times tn+1-alpha_f and tn+1-alpha_m, but I am not completely sure if I am using the right approach to compute the external load at time tn+1-alpha_f.
The weak form of equations is written using the virtual work, so in the end I get an equation for the residual in a form:
When doing the analysis in AceFEM, where the load is time-dependent, I use the same basic iteration loop as is shown in the AceFEM tutorial Example: simultaneous incrementation of time and BC multiplier. The load multiplier is changed using the command
In case of
alpha_f=1/2, does this ensure that the external load is taken at the middle of the time step?