I can't seem to figure out how to get the Model-->Output-->Process-->Linear Combination to give me what I want.
I would like to subtract one stress vector from another to get the stress range for fatigue calculations. Any pointers? / - \ = <--
Once I have that I would like to look at the max absolute principle stress of the combined top an bottom sheets.
Solved! Go to Solution.
You can use the Model / Output / Calculate command to create a new output vector containing your desired data. This equation will give you the absolute value of the Top X and Bottom X substraction:
1/Select output sets to process
2/Enter this equation
3/Select elements to process
Merci Monsiour Naffoussi. Ca me donne des ideas.
It is close to what I am looking for, but not quite.
Ideally, I would like to subtract the Case 2 tensor from the Case 1 tensor. Then extract the max(abs()) of the top and bottom maximum and minimum principle stresses. I do not want to subtract the top from the bottom, they are different.
Would it be better to do a linear combine (Case1 + -1*Case2) and then calculate the max(abs())?
The equation was for example.
For the substraction between two different output sets you can indeed use the Model/Output/Process and play with the scale factor. when the scale factor is left to 1 then Femap will do a summation of the two cases you select and will create a newest one which will contain the output vectors checked. Once the new output set is created you can use the Model/Ouput/Calculate and create a new results for ABS(outputvector).
Give it a try and keep me informed if it works for you.
Ok, I finally got back to this and figured out how to get what I wanted. We'll call this the Absolute-Max-Top-Bottom-Major-Minor-Principle-Stress-Range Finder.
Step 1 - Find difference between load sets
Set Scale Factor to 1 and select first set then…
Set Scale Factor to 1 and select second set …This will create a third set that calculates the
difference from 1 set to the next…or the range
Step 2 - Find Max abs of minor and major principle stresses for both top and bottom shell
Hopefully, someone will find this useful.