3 ms·
This doesn't seem right, how does a rod go from 1mm in diameter to 100mm in diameter under pressure? Also, how does one "wrap tightly"? The material would fract
by bdamm 6y ago
This doesn't seem right, how does a rod go from 1mm in diameter to 100mm in diameter under pressure? Also, how does one "wrap tightly"? The material would fracture under the stress of the first wrap.
- londons_explore 6y agoYou're right - I assume that kevlars spring constant is << the rod's. If that's the case, you just set the tension in the thread so the Kevlar is near its breaking point, and start winding, like winding thread onto a bobbin...
- flubert 6y agoNot being a mechanical engineer, I don't have an intutive feel for how the additive nature of the pressure develops as you describe. I would have thought that the outer layers would start to compress the inner layers, relaxing some of their stress. Is the a mech-e 101 type of link you could pass along to help get me up to speed? Or maybe you are saying that 3.6 GPa times the ratio of 100 mm to 1 mm gets us to the 360 GPa mark? So you don't need to have layers of Kevlar as your "anvil", you could use something else more rigid, and just wrap one layer of Kevlar around it and develop the needed pressure. Thanks.