Garments are not only stretched and bent; they are also twisted repeatedly during movement. Over time, this can create torsional fatigue in the fabric structure.
What Is Torsional Fatigue?
Torsional fatigue is the gradual change caused by repeated twisting cycles. The fabric may recover well at first but slowly develop distortion, residual twist or reduced shape stability.
Where It Matters
Sportswear, fitted sleeves, leggings, socks and technical garments can experience repeated rotational movement during use.
What Affects Durability?
- Yarn torque
- Knit or weave structure
- Elastane content
- Heat setting
- Coatings and laminations
How to Evaluate It
Repeated twist-and-release cycles can be used to compare fabrics. After cycling, inspect dimensional distortion, surface damage and recovery time.
Why This Is Different From Stretch Testing
Stretch testing applies mainly linear extension. Torsional testing looks at rotation. A fabric can recover well from stretching but still distort when repeatedly twisted.
Final Takeaway
Torsional fatigue is useful for understanding real movement durability. It is especially relevant for garments designed for repeated body rotation and high mobility.
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