units for tensile test wanted #3690
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bernoertel
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Yes, the unit is in millisecond. This is due to explicit solver have very low timestep (e.g, typically 8~10mm shell mesh of steel will roughly have a timestep of ~1 microsecond). Hence, if you're using the actual crosshead velocity of a tensile, then the simulation will take very long time. To mitigate this, we often speedup the loading. this is the 'trick' that we often employ to run tensile test using explicit solver, provided the strain rate input is removed. The only drawback is the noise when then the element is deleted due to failure |
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Hello,

I have calculated a tensile test with LS-Dyna und Open Radioss and the results are very equal, only 1,19% difference. But for presenting the results I need the units of the axis. The tensile test is done with the material steel with the density RO=7.8E-06 and E=210.0
For checking the values I attache the .k-file
zug_test3_RS.zip
On the website
https://www.dynasupport.com/howtos/general/consistent-units
I find for this unique combination of values the remaining units length=mm , time=ms , force=kN and endtime=40 (s) in LS-Prepost.
The Force-Time Diagramm of LS-Dyna, shown in LS-Prepost is the following:
Can I be sure, that the unit of x-axis is seconds and y-axis is kN , because a tensile test ending in 40 ms seems me much too fast.
In the hope, that Mr. Bulla will find my request.
Sincerly
Bernhard Oertel
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