Search found 1277 matches

by HarryvL
Tue Mar 19, 2024 10:14 am
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

Re: fcVM workbench

... and Abaqus uses the same definition (http://130.149.89.49:2080/v2016/books/u ... bmetalplas):

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Screenshot from 2024-03-19 11-11-25.png
Screenshot from 2024-03-19 11-11-25.png (54.23 KiB) Viewed 26 times
by HarryvL
Tue Mar 19, 2024 8:51 am
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

Re: fcVM workbench

In CCX and fcVM, an increment of PEEQ is calculated as follows: . PEEQ.png . with summation over ij. This is short-hand for: eps_ij eps_ij = eps_x^2+eps_y^2+eps_z^2+eps_xy^2+eps_yz^2+eps_zx^2+eps_yx^2+eps_zy^2+eps_xz^2). For the tensile test (where at failure eps_x=eps, eps_y=eps_z=-0.5eps and the s...
by HarryvL
Mon Mar 18, 2024 1:06 am
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

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%....
by HarryvL
Sun Mar 17, 2024 7:35 pm
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

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%....
by HarryvL
Fri Mar 15, 2024 8:33 am
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

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...
by HarryvL
Thu Mar 14, 2024 5:05 pm
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

Re: fcVM workbench

thschrader wrote: Thu Mar 14, 2024 4:31 pm BTW, what does the CSR value mean?
CSR = Critical Strain Ratio = PEEQ / critical strain

CSR < 1.0 OK. CSR > 1.0 plastic rupture.
by HarryvL
Thu Mar 14, 2024 2:52 pm
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

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...
by HarryvL
Thu Mar 14, 2024 1:22 pm
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

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 ==================...
by HarryvL
Wed Mar 13, 2024 5:18 pm
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

Re: fcVM workbench

In the next update I will report the maximum PEEQ and Critical Strain Ration (@ the integration points) below the progress bar.
by HarryvL
Wed Mar 13, 2024 5:10 pm
Forum: FEM
Topic: fcVM workbench
Replies: 83
Views: 5525

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...