Learning Forum

[Emre Guney]

Hi,

I encountered this error when I started a simulation.

forrtl: severe (157): Program Exception - access violation

There is no error in the message file.

As seen below, I am getting a negative value related to the added mass.
Could the problem be caused by this?
If not, what could be the reason for this?

Below are the timestep values I entered in the .k file.

*CONTROL_TIMESTEP
$#  dtinit    tssfac      isdo    tslimt     dt2ms      lctm     erode     ms1st
       0.0       0.9         0       0.0-3.2000E-7         0         0         0
$#  dt2msf   dt2mslc     imscl    unused    unused     rmscl     emscl      ihdo
       0.0         0         0                           0.0                   0

Thanks!

[Andreas Koutras]

Hello,

The error seems to be related to the contacts.

Indeed DT2MS<0 is recommended over a positive value. If you specify DT2MS=0, does this error still occur?

What is your LS-DYNA version?

Thanks

[Emre Guney]

Hello Andreas,

Thanks for your feedback

When I specify DT2MS=0 I get solution. However, the solution time is taking too long. (About 11 days). Previously, I determined DT2MS and solved similar projects(number of mesh, contact type, material etc.) within 1-2 days.

My version of Ls Dyna is R11.2.2