highly significantp < 0.001
A highly significant L × W interaction was observed ( p < 0.001), indicating that the magnitude of the effect of wool content varies with fibre length (and vice versa).
A highly significant L × W interaction was observed ( p < 0.001), indicating that the magnitude of the effect of wool content varies with fibre length (and vice versa).
A clear trend with fibre length is observed (≈ 3 mm > 6 mm > 10 mm), along with a length-dependent effect of fibre content: at 3 mm, increasing from 1 to 2 wt.% enhances σ y,c ; at 6–10 mm, higher content tends to provide no improvement or even reduce σ y,c .