Sorry, I meant it depends on the elastic modulus. Mechanics was a while ago. If the model matches the prediction, the model works. The argument is only over wh

Sorry, I meant it depends on the elastic modulus. Mechanics was a while ago. If the model matches the prediction, the model works. The argument is only over what regime. In this regime it matches. If you read the article it specifically mentions it applies to paper. I expect it would apply to many fabrics as well. When it doesn't it's because it's outside the regime of the model because stress enables significant "stretching". You could use beam theory as well, and I would be surprised if the author hasn't heard of it, but that doesn't mean it's the only technique available.