Prediction of Matrix Failure in Fibre Reinforced Polymer Composites

Figure 3

Illustration of failure envelope (plane-stress). UT = uniaxial tensile; BT = biaxial tensile; PS = pure shear; UC = uniaxial compression; 𝜎_eqvUC=𝜎_eqv with critical value determined from uniaxial compression test; 𝜎^′_eqvCS=𝜎^′_eqv with parameters determined from uniaxial compression and shear tests; 𝜎^′_eqvST=𝜎^′_eqv with parameters determined from shear and uniaxial tensile tests; 𝐽_1𝜎UT=𝐽_1𝜎 with critical value determined from uniaxial tensile test; and 𝐽^′_1𝜎UT=𝐽^′_1𝜎 with critical value determined from uniaxial tensile test.