{"id":163115,"date":"2021-10-15T09:20:34","date_gmt":"2021-10-15T09:20:34","guid":{"rendered":"\/forum\/forums\/topic\/comparison-between-implicit-and-explicit-results-for-quasi-static-simulation\/"},"modified":"2021-10-29T02:15:55","modified_gmt":"2021-10-29T02:15:55","slug":"comparison-between-implicit-and-explicit-results-for-quasi-static-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/comparison-between-implicit-and-explicit-results-for-quasi-static-simulation\/","title":{"rendered":"Comparison between implicit and explicit results for quasi-static simulation"},"content":{"rendered":"
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Hello<\/p>\n

I am performing a ¼ model simulation to calculate the extraction force of grommet as shown below. I perform both implicit static and explicit quasi-static in order to compare the result.<\/p>\n

The explicit has end time of 0.1s which makes the simulation a quasi-static simulation. I also check the hourglass and kinetic energy, it is OK. The explicit simulation setting is shown below.  <\/p>\n

I compare the force results between implicit(5N) and explicit(9N), explicit result has much higher extraction force even I have used hex dominant mesh. <\/p>\n

I also found that the grommet in static case has been pulled out of the steel(that is why we see a force drop in the curve), but for explicit case, we don’t see this(force still increases). Both cases use 8mm displacement load in the same location.<\/p>\n

I also use simple cases(tension, compression, shear) to check the difference. The results have good agreement between implicit and explicit except the simple case of compression with connection. Using different connection will have different result, the contacts case is more close to implicit result, the body interaction case is stiffer.<\/p>\n

My question is why the response is stiffer in explicit case? What can we do to obtain similar results between implicit and explicit?<\/p>\n

I attach my case with ANSYS 2020 R1 if you are willing to check. My explicit solver is Autodyn. Mooney-Rivlin parameter: C10=0.45822Mpa, C01=0.18055Mpa, D1=0.01Mpa-1<\/p>\n

Thank you in advance !<\/p>\n

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