Buckling of Composite Plates

[DYNACOMP]

I am trying to calculate the buckling of a simply supported rectangular composite plate with a symmetric layup using the Ritz method following Mechanics of Composite Structures (Springer & Kollar, 2003).

The calculation is working perfectly for uniaxial and biaxial loading but the resulting eigenvalue is out by approxiamtely 10% for shear buckling even when considering 20 half waves in each axis.

Is there a mistake in the shear term of equation 4.117? I have calculated the parameters rmi, rnj etc, by substituting the applicable variables. For example rmi = (2m / (m^2 - i^2))(1/pi)

https://files.engineering.com/getfile.aspx?folder=3503441d-a201-4ac7-98a2-370137fb82af&file=blk.png

https://files.engineering.com/getfile.aspx?folder=8f05d592-a19d-4734-82cf-ab5c0006588d&file=rij.png

 

[gantovnik]

Try to write email to Prof. Kollar:

[URL unfurl="true"]https://scholar.google.com/citations?user=l_sYNdgAAAAJ&hl=en
[/url]
[URL unfurl="true"]https://epito.bme.hu/kollar-laszlo?
[/url]
email: kollar.laszlo@emk.bme.hu

May be, he will answer all your questions. Ask him about reference to those equations, may be, they have a paper.

How do you know about "10% for shear buckling"? Comparison with FEM?

Vladimir Gantovnik, PhD

http://gantovnik.com