stress vs force plot

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  • Last Post 12 February 2020
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nyla posted this 12 February 2020

Hello,

I'd like to receive a feedback from you about the plot I want to create.

I've applied a force on a body and I get a stress result. I want to plot stress vs force applied. I'm thinking of subdividing the value of the force (that I have in components Y, Z) by 10  steps so I can export those value in excel and create the x axis. While the y axis represents the stress and is already divided in 10 steps.  Can it be a solution?

Moreover, I have the stress results as Von Mises stress, the tabular values include amximum minimum and average, which one should I use as y axis values?

Thank you!

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peteroznewman posted this 12 February 2020

Since von Mises Equivalent Stress is always positive, you would always want the maximum.

When you add a result under the Solution branch in Mechanical, in addition to the contour plot in the main graphics window, you also get a Tabular Data window. You can click on the cells and Ctrl-C to copy the values from the table and in Excel, Ctrl-V to paste.

Under Analysis Settings, there are two ways to get at least 10 points to show up in the Tabular results.  You can set the number of steps to 10, but then you have to edit the Force load and fill in the 10 rows to get the exact values of force you want at each step.  Alternatively, you can leave the number of steps at 1, but type in Initial and Minimum Subseps to be 10 and Maximum Substeps to be 100.  In some nonlinear solutions, you might get more than 10 substeps in the Tabular Data, but I don't mind that.

If the End Time was 1 second, but the applied force was 600 N for example, include the Time column when you copy the stress data from the tabular window and paste it into Excel, and then in Excel, insert a new column after Time and multiply Time by 600 and label that column Force (N) to go with the Stress data.

 

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nyla posted this 12 February 2020

Thank you Peter, but is there a way to accomplish this task without refreshing the solution? It's quite time consuming ! 

Now I have a two components of Force applied entirely in 1 step. The stress tab values instead are displayed in 10 steps from time 0 to time 1. 

When you said to multiply the Time column by 600 it was because the load in your case exceeded 100 N?

peteroznewman posted this 12 February 2020

You can take the Stress results in the Tabular data window from the computed solution to use in the Excel plot.

What was your applied force?  If it was 600 N, then you would multiply time by 600 to have a force column from the time column.  If your force was 3.4 N, then you would multiply time by 3.4 to get a force column from a time column where the End time is 1.0

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nyla posted this 12 February 2020

oh yes it's true. Thanks!

If I may ask you, about the stress data I found out that averaged stress data are a little bit different from unaveraged stress data. This can be a sign of mesh inaccuracy. However which one would you recommend to take into account for the plot? 

peteroznewman posted this 12 February 2020

Use the averaged stress, though not averaged across bodies. 

You should always perform a Mesh Refinement Study and see if the maximum stress is converging on a stable result value.

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nyla posted this 12 February 2020

 Thank you very much!

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