Hello,
Recently, I was trying to simulate a tensile test of a laminate material containing SiC and graphene layer embedded. I make the atoms on one side of the model to be immobilized and use velocity set to the atoms on the other side to stretch the material. I read the manual that velocity set can give the group of atoms velocities in three directions respectively. However, I used velocity set 0.01 0 0 units box and the model can hardly ever be stretched. From the visualization I cannot see obvious change at the pulling direction. When I increased the velocity to 0.05, now I can observe the model being stretched, but this only lasted for a while, although this time the stretch is very obvious. So, I feel like I have some misunderstanding on the velocity set. It seems to me that I cannot pull a material with this command using relatively small velocity if the material is hard to be stretched. Could somebody give me some clues about this phenomenon? (Please tell me if I need to provide the input file and log file.)
Thank you