ANSYS not matching Hand Calculations - simple structure
ANSYS not matching Hand Calculations - simple structure
(OP)
All,
I am having a hard time believing the ANSYS results that I am getting for a simple structure. Long story short, I am calculating around 11ksi bending stress for the attached structure, but when I run the ANSYS model with the same load, I am seeing stress levels that are almost double that. The rectangular stock is 9"x3"x1/2". Thoughts?
I am having a hard time believing the ANSYS results that I am getting for a simple structure. Long story short, I am calculating around 11ksi bending stress for the attached structure, but when I run the ANSYS model with the same load, I am seeing stress levels that are almost double that. The rectangular stock is 9"x3"x1/2". Thoughts?





RE: ANSYS not matching Hand Calculations - simple structure
a 0.5" hesh isn't that fine, only one element through the thickness.
not sure why the bending stresses are increasing towards the RH end ? unless there's a sizable moment at the constraint ...
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RE: ANSYS not matching Hand Calculations - simple structure
RE: ANSYS not matching Hand Calculations - simple structure
what are beam particulars to allow someone to verify your hand calc?
when you did the hand calc what restraint did you use at the fixed support (simple support of built in)? it we be closer to a simply supported as compared to a fixed
RE: ANSYS not matching Hand Calculations - simple structure
symmetrical, ANSYS is probably doubling the load.
Also, I don't see this being a simple hand calculation?
RE: ANSYS not matching Hand Calculations - simple structure
but symmetric model also means symmetric loads ... yes ?
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RE: ANSYS not matching Hand Calculations - simple structure
Also, as an update, I have run the full structure in ANSYS, and the results agree with the 1/2 structure that I have shown initially. The stress is more in the 20-22ksi range.
If the ANSYS is accurate, then I will have to improve this design drastically to meet our internal design standards, which is based off of UTS/5- Assuming A36 steel, this is 11.6ksi.
RE: ANSYS not matching Hand Calculations - simple structure
RE: ANSYS not matching Hand Calculations - simple structure
M = 38000*33 ... yes?
I = 97in4 ... for a single tube
stress = 1254000*4.5/(2*97) = 29ksi
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RE: ANSYS not matching Hand Calculations - simple structure
RE: ANSYS not matching Hand Calculations - simple structure
RE: ANSYS not matching Hand Calculations - simple structure