MATLAB >> Buckling Analysis by Rayleigh-Ritz Method

by Shaikh Akhlaque » Tue, 12 Oct 2004 01:07:27 GMT

Hi
I am working on "Buckling Analysis of composite materials by
ayleigh-Ritzmethod".

Can any one help me advising a MATLAB program regarding that?

Shaikh Akhlaque
Concordia University
Canada

E-mail:
XXXX@XXXXX.COM
XXXX@XXXXX.COM

MATLAB >> Buckling Analysis by Rayleigh-Ritz Method

by Per Sundqvist » Tue, 12 Oct 2004 02:28:31 GMT



I'm not familiar with "Buckling Analysis", but well with
Rayleigh-Ritz. In principle, you should determine an Action J, which
is an integral and minimize this integral with respect to some
variational parameters. In matlab it means you should use
"fminsearch"
You usually have linear combinations of trial functions (that
should obey the boundary conditions).

Example: Poisson's equ. in 1D have J=Int(L),
L=(1/2)*(dU/dx)^2-f(x)*U. With U(-a)=U(a)=0 you could take
U(x)=C0*(a^2-x^2). Integrating J and minimizing with respect to C0
gives you some result.

/Per

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