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?

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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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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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