Technical Weaving
Equal yarn counts in all three directions give true in-plane isotropy. Unbalance them and the fabric has a weak axis again — just a less obvious one.
— kN/m
All three yarn sets resolved onto the load axis
A resolved-yarn model gives the upper bound: it assumes every yarn reaches its full strength together, which real fabrics do not because the sets are not equally crimped and do not fail simultaneously. Use it to compare constructions and locate the weak direction, then test the laminate.
Triaxial Woven Fabric Directional Strength Predictor — free, with the formula and a worked example, at Textile School.