Enabling Initial Contact in SOL600?

I am building a model that has bolted joints. I have created three load steps (Perload, Fix & External Load). I am trying to run it on SOL600 for the first time as I have to do it in steps. When the solution type is choosen as Implicit Non-Linear (SOL600), in contact control paramers, by default it is checking the "Enable Initial conact". Is it required to do so? If so, do I need to pick bolt preload step Initial Contact Pair Loacase?

0 zhong.qin over 6 years ago

Enabling initial contact will request the solver to check contact status in increment "0" before any load cases. It is usually OK to use the same contact table as load case 1 (preload in your model).
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0 dheeraj.kothapalli over 6 years ago

Also, Just wanted to check, as I have to cumulative loads, do i need to pick non-linear in static solution parameters or can I pick Linear and still get to define cumulative steps? I have already defined contact which is non-linear. Just wanted to see if I can do Linear with cumulative steps just to save on solve time.
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0 Don.Graff over 6 years ago

You do need to use nonlinear, as a linear setting just runs each loading condition as a stand-alone case... the nonlinear setting allows for a 'load progression' type effect. If the solution is otherwise pretty linear, you could use small displacement theory by setting PARAM,LGDISP,-1... this could have the speed-up effect you are looking for. Zhong can correct me if I am missing anything.
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