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Beam Deflection Showing Incorrect Result

keith_harrison810keith_harrison810 Member Posts: 2 EDU
in Simulation

Hi All

New to simulations, and trying to do a simple beam deflection for a beam fixed at both ends and loaded at the center. See here:

https://cad.onshape.com/documents/9714c1e6df0806b18f037a70/w/cae2071b7c1304439066bf0c/e/9c4f8b858cd6235691ade2c5?renderMode=10&uiState=677c0f1bd5eb0a1e17e8e252

Onshape is consistently predicting a maximum deflection of about 4 times less than theory (using delta = FL^3/48EI, with I = bh^3/12). I've tried different beam lengths and material properties, and get the same error each time. Can anyone see what's going on?

Thanks!

.

Comments

  • GregBrownGregBrown Member, Onshape Employees, csevp, pcbaevp Posts: 250

    You have fully fixed boundary conditions for your beam, so your equation should read delta_max = F*L^3/192*E*I

    Also it is a really nice thing to do these hand calcs using variables:

    image.png

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