Search found 1275 matches
- Mon Mar 18, 2024 1:06 am
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
I do not really understand the triaxiality concept. When doing a hand calculation (with stress/strain tensors at yellow "X") I get a very low triaxiality, as to expect, nearly pure shear. PEEQ is 5%, analog to IdeaStatica the plastic limit is reached. In the end I get a epsilon_cr of 32%....
- Sun Mar 17, 2024 7:35 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
I do not really understand the triaxiality concept. When doing a hand calculation (with stress/strain tensors at yellow "X") I get a very low triaxiality, as to expect, nearly pure shear. PEEQ is 5%, analog to IdeaStatica the plastic limit is reached. In the end I get a epsilon_cr of 32%....
- Fri Mar 15, 2024 8:33 am
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
Latest update includes setting a target load factor. The analysis will halt and display the load-displacement curve at the specified target load factor (0.55 in the example below) or after completing the specified number of load steps, whichever comes first. To get the collapse load, just put a lar...
- Thu Mar 14, 2024 5:05 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
CSR = Critical Strain Ratio = PEEQ / critical strain
CSR < 1.0 OK. CSR > 1.0 plastic rupture.
- Thu Mar 14, 2024 2:52 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
I would use this workflow: Run a linear FEM analysis, check if sigma-vM exceeds the limit (in this case yes, above the stiffeners) Open fcVM-wb, use a load factor of 1,1 (for material safety) an plot the capacity curve. Check if the critical strain ratio is below 1. If so, check the peeq, in this c...
- Thu Mar 14, 2024 1:22 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
In the next update I will report the maximum PEEQ and Critical Strain Ration (@ the integration points) below the progress bar. I have updated the panel and plots to choose between CSR and PEEQ output =============================================== Updated fcVM panel and plot.png ==================...
- Wed Mar 13, 2024 5:18 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
In the next update I will report the maximum PEEQ and Critical Strain Ration (@ the integration points) below the progress bar.
- Wed Mar 13, 2024 5:10 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
I would use this workflow: Run a linear FEM analysis, check if sigma-vM exceeds the limit (in this case yes, above the stiffeners) Open fcVM-wb, use a load factor of 1,1 (for material safety) an plot the capacity curve. Check if the critical strain ratio is below 1. If so, check the peeq, in this c...
- Wed Mar 13, 2024 3:50 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
What gives me a headache is the wide range of alpha-values in table 4, used for EQ.4. Yes and these values are very large. Take alpha=3.0, for example. The formula would predict a critical strain of 3.0*exp(-1.5*1/3)=1.82 for a uniaxial tensile test (where triaxiality T=1/3). In fcVM I start from t...
- Wed Mar 13, 2024 1:45 pm
- Forum: FEM
- Topic: fcVM workbench
- Replies: 80
- Views: 5414
Re: fcVM workbench
... and (for example) to judge residual deformation after a loading/unloading cycle, set Output Options to Total Displacements, the Target LF to the desired value (0.55 here) and after achieving this value, set the Target Load Factor in the Matplotlib screen to 0.0. The Load-Displacement graph and R...