Theory 168/Textile wear/Ratio lens
Strength Is Twist Against Density
The claim
Yarn strength is set by the ratio of twist to linear density, so the same fibre is strong at one twist and weak at another.
01Mechanism
Twist creates lateral force between fibres; too little allows slip and too much causes obliquity.
02Prediction
Strength should peak at an intermediate ratio.
03Refutation
Strength increasing with twist would remove obliquity.