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. I need to find the value for “σ12”. Can I work it out with this formula
σ12= v12 (poissons ratio in the direction)/E13. If so how do i determine the poissons ratio? or is there another way??
Also I worked out the shear modulus G12 using the rule of mixtures: 1/Gc=vf/Gf+Vm/Gm. Is this correct??
My composite is a unidirectional carbon fibre tape of 10 layers in 0 degrees and also a sample in 90 degrees with epoxy resin. I dont have a 45 deg fibre sample
Many thanks