Failure criteria for Composite beams.
Failure criteria for Composite beams.
(OP)
Hello, 'm abit new to this forum and I would be glad if some one would answer my question.
I am doing some elastic stress analysis on composite beams, and I am new at this, I am not so sure of which failure criteria is best to apply. Personally I feel that Rankine and St. Venant(Maximum principal stress and strains)is out of the way.But then 'm not too sure which of the other three ( Tresea, Hencky and Von misses, and Beltrami& Haigh) is best for complex elstic failure analysis.
I am doing some elastic stress analysis on composite beams, and I am new at this, I am not so sure of which failure criteria is best to apply. Personally I feel that Rankine and St. Venant(Maximum principal stress and strains)is out of the way.But then 'm not too sure which of the other three ( Tresea, Hencky and Von misses, and Beltrami& Haigh) is best for complex elstic failure analysis.





RE: Failure criteria for Composite beams.
Dik
RE: Failure criteria for Composite beams.
There are a number of failure criteria for composite sections and one of the most common is the Tsai-Hill formulation which is probably most like the Von Mises criterion.
Regards,

Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: Failure criteria for Composite beams.
Dik
RE: Failure criteria for Composite beams.
The most common in my experience is Maxiumum Strain. It is the opinion of many in aerospace that this is all you need...
RE: Failure criteria for Composite beams.
RE: Failure criteria for Composite beams.
Any comments would be appreciated.
RE: Failure criteria for Composite beams.
RE: Failure criteria for Composite beams.
SWComposites (Aerospace),...I am using Glass fibre Reinfroced Plastci (GFRP) and I am looking at two beam shapes specifically.
1.Box beam 2. I-shaped Beam.
I am particularly investigating their Elastic coupling and not so sure what failure critieria to use to examine the beam when it fails due to the bending-twist or strech-twist coupling.
Thanks,