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Post by n2maniac on Nov 2, 2016 7:21:33 GMT
Here I am computing speeds of sounds across various materials and I get >10 km/s for UHMWPE. That isn't right. Looking at its properties, stiffness seems a bit off. Indeed, it is about 300 times lower IRL, and certainly not as stiff as steel (even though it may be stronger). Is it possible units were missed and it should be MPa? This should be a highly energy absorbing material, but is only moderately good in that respect right now. Edit: as pointed out later in the thread, UHMWPE as a correctly spun fiber matches ingame properties and is useful. UHMWPE as a bulk material is just a slightly better PE. |
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Post by drnovikov on Nov 2, 2016 7:38:34 GMT
The in-game info says "27.2 km/s" -- this is Unobtanium-Hypercryptonite Megadiamond WPE  Other stats are way off as well. In-game the Young's modulus is 172 GPa, while IRL it is 0.69 GPa, which is about 249 times less. |
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Post by lawson on Nov 2, 2016 23:23:04 GMT
Take a look at the specs for Spectra of Dyneema fibers. When you gell-spin UHMWPE and get the molecules really well lined up, along the fiber axis the mechanical properties get amazing. So unrealistic for bulk UHMWPE, but if a "sintered Spectra" material is added, current values are in the ballpark anyway.
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Post by jageriv on Nov 4, 2016 2:47:27 GMT
Take a look at the specs for Spectra of Dyneema fibers. When you gell-spin UHMWPE and get the molecules really well lined up, along the fiber axis the mechanical properties get amazing. So unrealistic for bulk UHMWPE, but if a material is added, current values are in the ballpark anyway.Hm, Hm, could you give some links for this? Because a several order of magnitude improvement based on manufacturing method seems a bit much. |
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Post by n2maniac on Nov 4, 2016 5:54:05 GMT
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Post by qswitched on Nov 5, 2016 3:20:25 GMT
UHMWPE stats in game is based on Dyneema rather than bulk UHMWPE, I did not call it that due to legal concerns of using registered trademarks. There is currently no bulk UHMWPE material in game.
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Post by lawson on Nov 7, 2016 12:25:35 GMT
UHMWPE stats in game is based on Dyneema rather than bulk UHMWPE, I did not call it that due to legal concerns of using registered trademarks. There is currently no bulk UHMWPE material in game. Good point. "Gell-spun PE" might be a more accurate generic name then? |
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Other stats are way off as well. In-game the Young's modulus is 172 GPa, while IRL it is 0.69 GPa, which is about 249 times less. 
