Kevlar
(Kevlar is a trademark of DuPont)
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Kevlar is a high strength aramid fiber invented by Stephanie Kwolek in the 1960s, and sold by DuPont since 1971 |
Kevlar 49 Properties |
Kevlar in matrix, WAG |
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3 |
GPa |
breaking strength |
2 |
GPa |
124 |
GPa |
tensile modulus |
82 |
GPa |
1.44 |
g/cm3 |
density |
1.5 |
g/cm3 |
2.08 |
MYuri |
specific strength |
1.3 |
MYuri |
9.3 |
km/s |
longitudinal speed |
7 |
km/s |
212 |
km |
9.8 m/s² support length |
130 |
km |
3.6 |
% |
max strain at break |
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2.4 |
% |
strength/tensile |
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1.4 |
km/s |
max transverse speed |
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110 |
$/kg |
cost (old citation) |
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- A 14 km/s loop increases speed by 69 m/s over a 100 km descent. That is a stretch of 0.49%, 20% of the strength/tensile ratio
- A 12 km/s loop increases speed by 80 m/s over a 100 km descent. That is a stretch of 0.67%, 28% of the strength/tensile ratio
\large stretch ~ \approx ~ { \Large { { \mu ( r_2 - r_1 ) } \over { V^2 r_2 r_1 } } ~ \approx ~ { 9.64 ~ km^2/s^2 \over V^2 } }
Kevlar Technical Guide downloaded from DuPont. Properties pdf page 9, thermal page 120