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Hi RPstress, thx for your reply. I had actually meant v12/E12 and I got this from a book when plane stress applies. You said for a uni directional, 12 shear direction is approx used for 13 direction but how do I work the shear stress in the 12 direction in the first place?? Would I need to...

Hi, I did some uni axial and flexural testing and I am using the Tsai wu failure criterion for anisotropic materials to prove failure. So I have my E11 from unixial testing and E22 from the flexural test. I am assuming plane stress, so terms in the 3rd laminate co-ordinate axes are eliminated...

Thx hemi, the article seems quite helpful but I didn't find any information on the perforations for the muffler pipe. either way thx for the help :)

Hi, I am new to this forum :) I am trying to design a muffler and so am in the process of determining how much fiber glass I need behind the perforated pipe. I was wondering if anyone knows how to workout the resonance frequency for a muffler? I have a 599cc engine with 11000 rpm and 70bhp. I...

Hi All, I am new to forum. I am currently looking into failure criteria and in particular Tsai Wu and Hashin form. I was wondering if anyone knew any good sources where I could understand these theories?? After a lot of Google search, Some of the sources give me the equation of Tsai wu as "≤...